warning: remote host identification has changed!

The second option is to clean up the entry from yourknown_hostsfile using the terminal. This is great if you dont want to dig into the file itself, or if you want to work with only one site or key. Or, create an account for $20 off your first month of Application Hosting and Database Hosting. # ssh-keygen -R cupcake No results were found for your search query. Someone could be eavesdropping on you right now (man-in-the-middle attack)! * Boot up the RPi with a SD card that previously generated the warning & ssh to it on the Mac. * * Please contact your system administrator. @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! When you connect to a remote device over SSH, the SSH client first gets a "fingerprint" for an ECDSA key of the remote device. The public keys on the server changed. For Windows, youll use a dedicated interface (and well talk about this in more detail later). In other cases, you may already know why theres a difference, although it pays to be vigilant regardless. The fingerprint for the RSA key sent by the remote host is x. * * Below is a sample, the second item is for BMC network port. There is a pro version, and I always recommend supporting developers when you can. To find it, open the Windows search bar, and navigate to your user folder with the %USERPROFILE% command. Add correct host key in /Users/MYNAME/.ssh/known_hosts to get rid of this message. , sshpublic key~/.ssh/known_hosts sshOpenSSH, Tangston: @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Search results are not available at this time. It can also handle hashed hostnames in a known_hosts.old file. ssh-keygen -R hostname ssh-keygen -R ipaddress ssh-keygen -f "/home/ec2-user/.ssh/known_hosts" -R "192.168..106" It is also possible that a host key has just been changed. The reason of refusal is that this is the exactly same scenario as the man-in-the-middle attack. On Windows, its stored in the registry. If youre hosting with a provider likeKinsta, this is called your Site IP address and can be found in your MyKinsta dashboard. If you arent sure which one to choose, look up your old and current IP address. @@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! Find hardware, software, and cloud providersand download container imagescertified to perform with Red Hat technologies. @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Kinsta spoiled me so bad that I demand that level of service from every provider now. @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Get a personalized demo of our powerful dashboard and hosting features. Theres one more method to alter the known_hosts file on Mac: using the ssh-keygen utility from the command line. If you are sure that it is harmless and the remote host key has been changed in a legitimate way, you can skip the host key checking by sending the key to a null known_hosts file: $ ssh -o "UserKnownHostsFile=/dev/null" -o "StrictHostKeyChecking=no" user@host. Step 1 Install the free SSH Config Editor app. Here's how to enable WP_DEBUG in your wp-config.php file to find the culprit and some other tips for debugging your WordPres, Check out this in-depth tutorial on how to fix the leverage browser caching warning on your WordPress site that you get from Google PageSpeed Insig. In fact, were going to go as far as saying its the number one priority for your website. Talk with our experts by launching a chat in the MyKinsta dashboard. It is also possible that a host key has just been changed. But Im documenting the following for you just in case. Tell us about your website or project. @@@@@ @ warning: remote host identification has changed! It is also possible that a host key has just been changed. Add correct host key in /Users/isaacalves/.ssh/known_hosts to get rid of this message. @@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! An example of one of these checks is the following, which identifies when the fingerprint of a server has changed: When you connect to a server via SSH, it gets a fingerprint for the ECDSA key, which it then saves to your home directory under ~/.ssh/known_hosts. If you're on a tight budget, the free version is enough to manage your known_hosts file. Its important to note that Windows machines might not have a known_hosts file. this message appears, if your known_host file contains a conflicting obeselte key from in your case, a previos install, as it created new keys, and your clients still have the old rsa keys for the same Regardless, you can fix the error in no time through a Command Prompt or Terminal, using just a handful of commands. This is done after first connecting to the server, and will prompt you with a message like this: If you enter 'yes', then the fingerprint is saved to the known_hosts file, which SSH then consults every time you connect to that server. Click Yes when you get the following prompt: Deleting certain registry values could cause system instability. Of course, if the fingerprint differs from what is in the known_hosts file, this could indicate a malicious user is targeting you. Someone could be eavesdropping on you right now (man-in-the-middle attack)! By deleting this line, your SSH client won't have an ECDSA key fingerprint to compare to, and thus will ask you again to verify the authenticity of the server the next time you connect. Your job is to delete whichever one is causing an issue: Once you click on the Delete button, youll also need to confirm that you want to remove the key: Clicking Yes here means the key will be gone for good, and you shouldnt get the Warning: Remote host identification has changed error any longer. 0 general. @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! Follow the steps below. If you arent sure which one to choose, you should look up your old and current IP address. Someone could be eavesdropping on you right now (man-in-the-middle attack)! RSA host key for cupcake has changed and you have requested strict checking. You probably wont need the SSH Config Editor app that often, so I dont recommend pinning it to your dock. ACM.99 Verifying that you are making an SSH connection to the host you think you are This is a continuation of my series of posts on Automating . You may get the Warning: Remote host identification has changed error for a few reasons, and some are innocent. Follow the steps below. Search for hostname or IP on the file and delete the line. For example, if you recently migrated your website to a new hosting provider, your IP address would be different. @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ First, though, lets give you some more details on the error message itself. Another option would be to remove all the entries. After you type 'yes', ssh will add the new key to your known_hosts file and proceed. The fingerprint for the RSA key sent by the remote host is SHA256:FbutMeM/HvPp1X4yt8938QzMKkNtlp9a5GzqwP2OTDo. Offending RSA key in /Users/isaacalves/.ssh/known_hosts:12 RSA host key for 104.131.16.158 has changed and you have requested strict checking. @ Within the SshHostKeys folder, remove the entry that is having the issue. Windows cmd 2 Linux .ssh Windows .ssh known_hosts Linux ssh . Check out our plans. Youll notice that the error message references a known_hosts file. I never have to remember terminal commands. You may get warnings, but get the option to connect. message is trying to warn you about. But Ill walk you through both methods. . Delete it! It is also possible that a host key has just been changed. For a limited time, your first $20 is on us. Unsubscribe at any time. On Microsoft Windows, if using PuTTYcache The easiest ways I've found to fix this problem is the following two solutions. . It is also possible that a host key has just been changed. On Windows, they dont have aknown_hostsfile, the information (IP address and credentials) is stored in the registry. If you installed a new OS it has a new key. Please try again later or use one of the other support options on this page. Cause The cause for the issue is that the host key for some net interface have changed, all the host keys for the target compute node need be renewed. Last login: Wed Feb 16 07:00:03 CST 2011 on ssh from icecream.austin.ibm.com Any existing connection history on your computer is meaningless. To remove this message, simply open a new terminal window and enter the following command (where IPADDRESS is your server's IP address): ssh-keygen -R IPADDRESS Please contact your system administrator. RSA key fingerprint is d7:3b:a3:5b:88:d2:f4:96:80:0d:8e:a0:8d:44:a2:d2. @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! SPI, https://blog.csdn.net/wangguchao/article/details/85614914, Ubuntu16.04pythonPython2Python3, Gazebo 77.1.3[gazebo-2] process has died[gazebo_gui-3] process has died. When you connect to a server via SSH, it gets a fingerprint for the ECDSA key, which it then saves to your home directory under ~/.ssh/known_hosts. I craft actionable content and develop performance-driven WordPress plugins. Tired of subpar level 1 WordPress hosting support without the answers? eg: ssh-keygen -R "basezap.com". Check out our hands-on, practical guide to learning Git, with best-practices, industry-accepted standards, and included cheat sheet. It is also possible that a host key has just been changed. However, the system works almost too well. Read on to learn how! Host key verification failed. Do you want to remove [xx.xxx.xx.xxx]:xxxxxx from known hosts? Subsequently it pops up the second warning: The authenticity of host . The issue on the client side host file will be fixed. This happens to me now and then, and its very annoying, as Im usually in a hurry to fix something. @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! However, if you use the OpenSSH client, there is a file. SSH, or Secure Shell, is a very common way to securely access remote machines, typically via the command line. . One common reason this key changes is because you have changed your root password or rebuilt your VPS server. If you dont want to be subject to a machine-in-the-middle attack, youll want to use SSH access when you log in. If you are 100% sure that this was expected behavior and that there is no potential security issue, you'll need to fix the issue before continuing. Then try the ssh again. Original contents retained as /home/myuser/.ssh/known_hosts.old If you are confident that the host key changed for a known reason (i.e. @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! a re-install of the openssh filesets on the server), then you can use the ssh-keygen command, as the user who received the error, to remove the offending key. QSPIQuad SPI6spi How to Fix "WARNING: UNPROTECTED PRIVATE KEY FILE!" You can work to fix the Warning: Remote host identification has changed error for both Windows and macOS. From simple plot types to ridge plots, surface plots and spectrograms - understand your data and learn to draw conclusions from it. 2013-2022 Stack Abuse. Save time, costs and maximize site performance with: All of that and much more, in one plan with no long-term contracts, assisted migrations, and a 30-day-money-back-guarantee. I prefer using an app, as its quick and easy. You can fix the problem by removing the IP address that you are trying to connect to from your ~/.ssh/known_hosts file. Someone could be eavesdropping on you right now (man-in-the-middle attack)! If you create a ~/.ssh/config you can disable StrictHostKeyChecking. Inside will be a list of keys: Here, you can delete the key thats causing the problem, then resave the file. Try our world-class support team! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@2 ~ When host keys on a remote system have changed, either because they were manually regenerated or because ssh was re-installed, the new host key will not match the one stored in the user's known_hosts file, and ssh will report the error then exit. warning: remote host identification has changed! @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! Close the window and click Save on the following prompt: Do you want to save the changes made to the document known hosts? Learn more Click to Tweet. You shouldnt attempt to fix the error unless you have complete confidence that the issue isnt malicious. It's not always a bad thing (it's protecting your connection from malicious attacks! Last unsuccessful login: Mon Dec 6 13:51:17 CST 2010 on /dev/lft0 Please contact your system administrator. Its always annoying to run across errors like these. (I replaced real names with MYNAME and real ip with MYIP and deleted part of the RSA key) Drag the original known_hosts file to the trash. However, theres one aspect we can touch on a little further before showing you how to fix the Warning: Remote host identification has changed error. But you can fix this in a few steps. Someone could be eavesdropping on you right now (man-in-the-middle attack)! 3. We'll get back to you in one business day. lost connection The first time you ever connect to this device, it will save this fingerprint to a local file (by default, it will be the "~/.ssh/known_hosts" file on a Unix-like operating system). You can also set these options permanently in ~/.ssh/config (for the current user) or . We also try to be at that level with our SaaS tool support. Log in. Add correct host key in /home/xxxxx/.ssh/known_hosts to get rid of this message. This option is useful to delete hashed hosts (see the -H option above). By the way: what needs to be done is told in lines 10 through 12 in your message. Solved: remote host identification has changed Issues with WordPress? sed -i '/1.2.3.4/d' /home/scott/.ssh/known_hosts From the ssh-keygen man page: -R hostname Removes all keys belonging to hostname from a known_hosts file. WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED. remote host identification has changed! For example, ssh-keygen -R 192.168.3.10. Then click the trash can icon to delete the entry. The fingerprint for the RSA key sent by the remote host is Offending key in /home/myuser/.ssh/known_hosts:4 QSPIQuad SPI6spi Youll want to open the Windows Registry Editor (otherwise known as regedit). No spam ever. I receive this error on any switch that I try to ssh to a particular Cat4500 switch and unable to access it via remote/ssh access. @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! # ssh-keygen -R cupcake /home/myuser/.ssh/known_hosts updated. It also includes security features, such as virus protection and migration assistance. Its used as a reference client file for the authentication process. The fingerprint for the RSA key sent by the remote host is The authenticity of host 'cupcake (127.0.0.1)' can't be established. I have a client-server pair and am trying to reproduce the warning: REMOTE HOST IDENTIFICATION HAS CHANGED! Solution #2: Add correct host key in /home/user/.ssh/known_hosts It is not necessary to delete the entire known_hosts file, just the offending line in that file. @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! REMOTE HOST IDENTIFICATION HAS CHANGED! . The fingerprint for the ECDSA key sent by the remote host is SHA256:XXXXXXXXXXXXXXXXXXXXXXX. IP, @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 2022 Kinsta Inc. All rights reserved. The connections you use to log into servers need your utmost attention. Connect on Twitter, subscribe to my newsletter (once a month), or buy me coffee. # ssh myuser@cupcake In the warning message find the line that tells you where the offending ECDSA key is located in the, Delete the line specified in the warning message. When a user tries to do SSH to SRX, he gets an RSA finger print mismatch message. Here, were going to use Nano. and refuses to connect to hosts whose host key has changed. Follow the steps below. Are you sure you want to continue connecting (yes/no)? @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! Another solution would be to use the ssh-keygen utility to delete the offending key from your known_hosts file, which can be done with the following command: This method is good if you don't want to manually alter the known_hosts file yourself, and the utility is easier to use if you have multiple hostnames and IP addresses to fix. Host key verification failed. Below Ill walk you through a few quick and easy ways to resolve the error and get connected again. If youre on a tight budget, the free version is enough to manage yourknown_hostsfile. You need to update yours and the admin is the one to do that. Please contact your system administrator. We think our community is one of the best thanks to people like you! Warning: Permanently added 'cupcake' (RSA) to the list of known hosts. Open SSH Config Editor and click on File Open Known Hosts.. SSHIPOS. You shouldnt attempt to fix the error unless you have complete confidence that the issue isnt malicious. The host is unknown. There are a couple of ways to go about fixing yourknown_hostsfile on a Mac. It is also possible that a host key has just been changed. The fingerprint for the RSA key sent by the remote host is SHA256:g38Q4Xc1UI4WcClY+GaohmhZSOHbgLo6+eYBFr0Iu6U. Offending key in /Users/MYNAME/.ssh/known_hosts:3 RSA host key for MYIP has changed and you have requested strict checking. yes Warning: Permanently added 'switch1,192.168.1.101' (RSA) to the list of known hosts. warning: remote host identification has changed! This will open the directory within the File Explorer. Learn more in this guide Click to Tweet. Learn the landscape of Data Visualization tools in Python - work with Seaborn, Plotly, and Bokeh, and excel in Matplotlib! Global audience reach with 35 data centers worldwide. Host key verification failed. delete the old keys in your dir /root/ssh/known_hosts file, after doing so, it will add peacefully your new hostkeys to the known_hosts file. forum:bopritchard 6 years, 3 months ago. The key will change if any changes are made requiring recreating the instance are needed: something as dumb as setting a scope, adding a service account, or even the lovely setting a description on an instance will force a replacement of a VM and the host key will change. Are you sure you want to continue connecting (yes/no)? Important Manually Resolve via known_hosts In the warning message find the line that tells you where the offending ECDSA key is located in the known_hosts file. There will also be a .ssh folder within: The file we want in this folder is known_hosts. Find and highlight the entry that is having the issue. After this, when you will try to use SSH to connect to the host, you will see this message: The authenticity of host ' [your host information . This type of hosting includes a support team that will make sure your site runs as it should. After that, delete the line with the key for this IP address. * * ************************************************************** REMOTE HOST IDENTIFICATION HAS CHANGED! Offending RSA key in /home/xxxxx/.ssh/known_hosts:2 RSA host key for xxxxx has changed and you have requested strict checking. In my case, I had an elastic IP address on AWS and assigned it to a different server after redeploying our application. WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED. by daves, june 25, 2014 in power pmac. dhcp . Optimization with our built-in Application Performance Monitoring. The fingerprint for the RSA key sent by the remote host is. Hopefully, now you have connected again and are back at work! It is also possible that the RSA host key has just been changed. How to fix the warning: remote host identification has changed! Someone could be eavesdropping on you right now (man-in-the-middle attack)! * Welcome to AIX Version 6.1! Are you sure you want to permanently delete this value? I am aware that one way to achieve this is to change the ecdsa key on the ssh server and force the server to use its ecdsa key to identify itself by editing Hostkey in /etc/ssh/sshd_config. Whats more, most macOS and Linux machines have an SSH client built into the Operating System (OS). Here is the simplest solution: ssh-keygen -R <host>. Diagnosis Instant help from WordPress hosting experts, 24/7. You might also want to delete the entire known_hosts file, especially if you only use SSH for one or two sites. Step 2 Open SSH Config Editor and click on "File Open Known Hosts." Open known_hosts file Step 3 Find and highlight the entry that is having the issue. Someone could be eavesdropping on you right now (man-in-the-middle attack)! Your local ssh key does not match the remote ssh key. Another option would be to remove all the entries. Someone could be eavesdropping on you right now (man-in-the-middle attack)! However, the SRX device still has the old RSA key fingerprint value for the remote host in its database at /cf/root/.ssh/known_hosts . This error brings me to a halt. . You can access your site from almost anywhere you can use the internet, as long as you have the right login credentials. ". issue But, sometimes, for some reason, it could happen that remote host changes its ECDSA key. @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! The fingerprint for the RSA key sent by the remote host is bd:95:8d:91:33:f7:c1:dd:96:29:47 . You should now be able to connect to your website and or server again. Kinsta and WordPress are registered trademarks. It is also possible that the RSA host key has just been changed. Get premium content from an award-winning WordPress hosting platform. The fingerprint for the RSA key sent by the remote host is SHA256:eYTtqNXZHMS . @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! The name should give you a clue as to what it contains, but for clarity, its a list of SSH remote hosts known to the computer. Join 20,000+ others who get our weekly newsletter with insider WordPress tips! 1@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! SSHWARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! ************************************************************** Host key verification failed. However, you have more flexibility for doing so on Mac. 1. To fix the problem of remote host identification has changed , we can also remove the old host key info with ssh-keygen command. Why you're getting Remote Host Identification Has Changed Warning This happens when you connect a different machine with the exact same IP address before. Someone could be eavesdropping on you right now (man-in-the-middle attack)! Learn more in this guide , A Complete Guide to WordPress Debugging (Enable WP_DEBUG + Other Tools), How to Fix the Leverage Browser Caching Warning in WordPress, A Guide To HTTP And The WordPress HTTP API Part 2. In the nano editor, being on the . If the client thinks those fingerprints differ from what it understands to be correct, youll get the Warning: Remote host identification has changed error at the point of login: As errors go, this is detailed and clear it tells you whats happened, a potential reason for why, and how you might fix it. ), but it can be accidentally caused by your own activity. $, Modified date: ECDSA key fingerprint is SHA256:hotsxb/qVi1/ycUU2wXF6mfGH++Yk7WYZv0r+tIhg4I. error, How to fix your known_hosts files on Windows. . Web security isnt just about installing plugins and creating a strong password. The connection information (IP address and credentials) on your Mac is stored in yourknown_hostsfile. Ever seen this error? In that case, since the public key is changed for this same IP, connection got refused. The simplest solution to get rid of this warning is to remove the old identity of the remote server so that we can store the new identity of the remote server. This will open a new Nano instance and display the keys within your known_hosts file: You should delete the key causing the Warning: Remote host identification has changed error, then save your changes. @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! Someone could be eavesdropping on you right now (man-in-the-middle attack)! "warning: remote host identification has changed!" dhcpipos ip:192.168.3.5centosvyos. The IP address and hostname I was connecting to were the same, but the underlying server was different, which is what tripped the SSH client to issue this warning. You can fix the problem by removing the IP address that you are trying to connect to from your ~/.ssh/known_hosts file. Just leave it installed for the occasions when you do get the connection error. @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that a host key has just been changed. The fingerprint for the ECDSA key sent by the remote host is SHA256:Yjpzsxo3jodfkjdid8dfd8jjN . Open your start menu and search regedit. Click Enter.. Its sort of like a Secure Sockets Layers (SSL) handshake, and in fact, there are some high-level similarities between SSH and SSL. Learn more , Ever seen this error? When you use an SFTP client (my favorite isForkLift) or SSH client (PuTTY), it uses the information to connect to the webserver. The fingerprint for the ECDSA key sent by the remote host is SHA256:******. @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! I tried zeriozing the key on the switch I get the error when trying to ssh to. If this new server is malicious then it would be able to view all data sent to and from your connection, which could be used by whoever set up the server. I use the following (on my iMac) to disable ONLY for my local network (for which it is unnecessary). @, @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@. * * @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! ssh-keygen -R hostname/ipaddress Step 3 Try reconnect again --- The authenticity of host 'switch1 (192.168.1.101)' can't be established. a re-install of the openssh filesets on the server), then you can use the ssh-keygen command, as the user who received the error, to remove the offending key. then I configure to no avail: crypto key generate rsa general-keys modulus 2048 Perhaps I am using incorrect parameters. Read our Privacy Policy. Are you sure you want to continue connecting (yes/no)? Your laptop is aware of nothing about that host. Error - WARNING REMOTE HOST IDENTIFICATION HAS CHANGED This is actually not an error message. When you first connect to a server, youll often get a confirmation request through your interface, asking whether you want to connect. @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Some users may prefer the PuTTY client. @ @@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! If the problem is on YOUR end you can remove line THREE (and ONLY line three) in . If this was helpful or you had a problem, leave a comment below. Offending RSA key in /root/.ssh/known_hosts:189 RSA host key for 10.101.6.11 has changed and you have requested strict checking. Our preferred approach is to access the file within a Terminal window (or iTerm2 if you use that app), and also open it with a dedicated Nano or Vim editor. Add correct host key in /home/myuser/.ssh/known_hosts to get rid of this message. This will add a file to the folder named "known_hosts copy" that ssh authentication will ignore. Beforeswitching from Windows to Mac, I actually never encountered this error. WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! To achieve this, open a Terminal window and run ssh-keygen, followed by your server hostname. 17 June 2018, [{"Product":{"code":"SWG10","label":"AIX"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"Network communications","Platform":[{"code":"PF002","label":"AIX"}],"Version":"Version Independent","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}], ssh fails with "Warning: Remote Host Identification Has Changed! To do this, you can run rm .ssh/known_hosts in a Terminal window. In my example this line said "Offending ECDSA key in /Users/scott/.ssh/known_hosts:47", which refers to line 47. @ @@@@@ it is possible that someone is doing something nasty! For example if you have 3 server as follows. RSA key fingerprint is zzzzzzzzzzzzzzzzzzzzzzzzzzzzzxxxxxxxxx. The known_hosts file should be in /home/username/.ssh/known_hosts location or else you can use the following command to remove the entry. Follow the steps below. Right-click on the known_hosts file in the Finder window & choose "Duplicate" from the contextual menu. Once done, you'll have a new fingerprint in our known_hosts file for this server, and the warning will be gone. An SSH connection uses dedicated keys small files stored on your computer as authentication. 1 WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! Over the next few minutes, were going to show you how to fix the Warning: Remote host identification has changed error for both Windows and Mac. For example: This wont ask you if you want to delete the specified lines, so make sure youre removing the right ones before proceeding: Once this is done, you shouldnt get the Warning: Remote host identification has changed error from there on out. The fingerprint for the RSA key sent by the remote host is This can happen if you have created a new server with an IP address you had previously used on a different server. body a.novashare-ctt{display:block;background:#00abf0;margin:30px auto;padding:20px 20px 20px 15px;color:#fff;text-decoration:none!important;box-shadow:none!important;-webkit-box-shadow:none!important;-moz-box-shadow:none!important;border:none;border-left:5px solid #00abf0}body a.novashare-ctt:hover{color:#fff;border-left:5px solid #008cc4}body a.novashare-ctt:visited{color:#fff}body a.novashare-ctt *{pointer-events:none}body a.novashare-ctt .novashare-ctt-tweet{display:block;font-size:18px;line-height:27px;margin-bottom:10px}body a.novashare-ctt .novashare-ctt-cta-container{display:block;overflow:hidden}body a.novashare-ctt .novashare-ctt-cta{float:right}body a.novashare-ctt.novashare-ctt-cta-left .novashare-ctt-cta{float:left}body a.novashare-ctt .novashare-ctt-cta-text{font-size:16px;line-height:16px;vertical-align:middle}body a.novashare-ctt .novashare-ctt-cta-icon{margin-left:10px;display:inline-block;vertical-align:middle}body a.novashare-ctt .novashare-ctt-cta-icon svg{vertical-align:middle;height:18px}body a.novashare-ctt.novashare-ctt-simple{background:0 0;padding:10px 0 10px 20px;color:inherit}body a.novashare-ctt.novashare-ctt-simple-alt{background:#f9f9f9;padding:20px;color:#404040}body a.novashare-ctt.novashare-ctt-simple-alt:hover,body a.novashare-ctt.novashare-ctt-simple:hover{border-left:5px solid #008cc4}body a.novashare-ctt.novashare-ctt-simple .novashare-ctt-cta,body a.novashare-ctt.novashare-ctt-simple-alt .novashare-ctt-cta{color:#00abf0}body a.novashare-ctt.novashare-ctt-simple-alt:hover .novashare-ctt-cta,body a.novashare-ctt.novashare-ctt-simple:hover .novashare-ctt-cta{color:#008cc4}A secure internet connection is not just the ideal it's essential While it may be annoying, this error protects your connection from attacks. 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