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In this article, I am prove you how to resolve "host key verification Failed" mistake in Linux. I am sure many of you uses ssh protocol to admission remote host in Linux. Many of you also have observed this "host key verification failed" fault while trying to connect remote server through ssh based commands. This error usually occurs when remote host change its cardinal very oftenly due to certain reasons. We will now go through below given 2 dissimilar methods to prepare this upshot.

SSH "Host Key Verification Failed" Error in Linux

In this case nosotros have 2 different host to demonstrate the "host key verification failed" error in Linux.

192.168.0.100
192.168.0.106

Here we are trying to copy ssh public key from ane host(192.168.0.100) to some other host(192.168.0.106) using ssh-copy-id command as you can come across below. Similar in many ssh fault whenever we confront this kind of situation so the kickoff thing we always try is to connect remote host through simple ssh command and check if this error still throws or not.

root@localhost:~#          ssh-copy-id root@192.168.0.106          /usr/bin/ssh-copy-id: INFO: Source of primal(s) to exist installed: "/root/.ssh/id_rsa.pub" /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(southward), to filter out whatsoever that are already installed  /usr/bin/ssh-re-create-id: ERROR: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ Mistake: @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ Error: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ Fault: IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Mistake: Someone could exist eavesdropping on y'all right now (human-in-the-center attack)! ERROR: It is also possible that a host central has merely been changed. Fault: The fingerprint for the ED25519 key sent by the remote host is ERROR: SHA256:mx1ctmvoleWzmA3kVqOr+H9uIMQFPsK9eTXlnJ5fnGA. Fault: Delight contact your arrangement administrator. Error: Add correct host key in /root/.ssh/known_hosts to go rid of this message. ERROR: Offending ECDSA fundamental in /root/.ssh/known_hosts:5 Mistake: remove with: Mistake: ssh-keygen -f "/root/.ssh/known_hosts" -R "192.168.0.106" Mistake: ED25519 host cardinal for 192.168.0.106 has inverse and you have requested strict checking. Mistake: Host cardinal verification failed.        

Notation:

Please note that here I am using root user to run all the below commands.You can use any user with sudo admission to run all these commands. For more information Please check Footstep by Step: How to Add User to Sudoers to provide sudo admission to the User.

At present hither we are trying to connect remote host(192.168.0.106) using ssh command but we see same error here as well.

root@localhost:~#          ssh root@192.168.0.106          @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS Changed! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ Information technology IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-center set on)! It is also possible that a host cardinal has just been inverse. The fingerprint for the ED25519 fundamental sent past the remote host is SHA256:mx1ctmvoleWzmA3kVqOr+H9uIMQFPsK9eTXlnJ5fnGA. Please contact your system ambassador. Add correct host fundamental in /root/.ssh/known_hosts to get rid of this bulletin. Offending ECDSA key in /root/.ssh/known_hosts:five remove with: ssh-keygen -f "/root/.ssh/known_hosts" -R "192.168.0.106" ED25519 host key for 192.168.0.106 has changed and you have requested strict checking. Host key verification failed.        

Method i: Remove the one-time Key manually

We demand to get-go check the known_hosts file and place the Line which needs to exist removed. As shown in the in a higher place output Offending ECDSA Key is in Line five.

root@localhost:~#          vi /root/.ssh/known_hosts          |1|5CmiAXPuYGM70G8z3heGuwoSs7E=|jkGqOlPtgJ2mZbAzAq/AJNADN3I= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/8/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM= |ane|xHNRVs6McL0Gp80pV7a+ljscOLE=|gTJY5lhzrj4QYaBD9JA3UflX/lM= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/8/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM= |1|CBAvhjKLrxeAAzM2uT8J4szRSps=|HI5xiBZaeanE8crsBtzLKBmAqXs= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/eight/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM= |one|Db8TGhcXNuKRxXXwNCwjqSt1/uU=|mo9PyxWR3TIQlwud9frNGRcPWe8= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/eight/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM=          |ane|q5/RG/dsqu+dE74tZIlw8e1ChqE=|nB0ZXIXI4K1yurS7UDC3OPfpXPI= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNqUWv4MFC3F1saxTSdfKq7hsQrpYnndhtYKS3o9mye18Wlj9eQVioFJfjklV+k2/tyh44edzobcBbxSRIsxvb8=          |1|AyDcLMMCoc+AHSDzIyc8pPR0dHk=|6xF+Gxzl3GwwWDwA6BMUhCtayI0= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBGozD0jj2XM/ZDyI0Zo1M90Z3phgG2df2bWy166hAl5xvRGiI8gFP+G1ScJ8uRZr9AiFFGWBDWQIO/VBtmjR7Gg= |ane|3Yp+dAPXHBMy9vu5me5SsB1J3vM=|UExr+SJXdZmOSC8y4CBnOr5taqc= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBFavUGGTHtoc82HQuv0u6DEEZrabdcGc8l3qjgoacRx0gvVtr5PFKHtBpGwfsuxkDxjGw5ve4cLanT9iDzRLwK0= |1|AytaU8PXh+Lbjz5WxyWIEB/rGiE=|dusFRGTKPdkY997X+n+BMW1uQSM= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBA4Lyy04vbYabkqH3V2226NKohEcKoIOjnPhWDLjBr/8Fag94xwUEAbOyWOrpFh7MfAXWW58iaq/k49CPYXP5ss=

So from the in a higher place file we need to delete Line 5 using sed -i '5d' ~/.ssh/known_hosts command as shown below.

root@localhost:~#          sed -i '5d' ~/.ssh/known_hosts        

Now if you lot once again cheque /root/.ssh/know_hosts file then you can see Line number 5 is deleted at present as can be seen from below output.

root@localhost:~#          cat ~/.ssh/known_hosts          |1|5CmiAXPuYGM70G8z3heGuwoSs7E=|jkGqOlPtgJ2mZbAzAq/AJNADN3I= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/8/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM= |1|xHNRVs6McL0Gp80pV7a+ljscOLE=|gTJY5lhzrj4QYaBD9JA3UflX/lM= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/8/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM= |one|CBAvhjKLrxeAAzM2uT8J4szRSps=|HI5xiBZaeanE8crsBtzLKBmAqXs= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/8/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM= |1|Db8TGhcXNuKRxXXwNCwjqSt1/uU=|mo9PyxWR3TIQlwud9frNGRcPWe8= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAPzd/8/PhIgKU3FIPVEUwIyoQHOt8eJoABt0RaufdVrrPnFHHSQ6jXBRV9hSkamZSGBHPsmE3f/dY7tnpHoZUM= |i|AyDcLMMCoc+AHSDzIyc8pPR0dHk=|6xF+Gxzl3GwwWDwA6BMUhCtayI0= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBGozD0jj2XM/ZDyI0Zo1M90Z3phgG2df2bWy166hAl5xvRGiI8gFP+G1ScJ8uRZr9AiFFGWBDWQIO/VBtmjR7Gg= |one|3Yp+dAPXHBMy9vu5me5SsB1J3vM=|UExr+SJXdZmOSC8y4CBnOr5taqc= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBFavUGGTHtoc82HQuv0u6DEEZrabdcGc8l3qjgoacRx0gvVtr5PFKHtBpGwfsuxkDxjGw5ve4cLanT9iDzRLwK0= |1|AytaU8PXh+Lbjz5WxyWIEB/rGiE=|dusFRGTKPdkY997X+due north+BMW1uQSM= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBA4Lyy04vbYabkqH3V2226NKohEcKoIOjnPhWDLjBr/8Fag94xwUEAbOyWOrpFh7MfAXWW58iaq/k49CPYXP5ss=        

Method two: Remove Known Hosts Using ssh-keygen control

Another method is to use ssh-keygen command to resolve this error. Y'all can remove the entry of remote host from known_hosts file using beneath ssh-keygen control.

root@localhost:~#          ssh-keygen -f "/root/.ssh/known_hosts" -R "192.168.0.106"          # Host 192.168.0.106 constitute: line 5 /root/.ssh/known_hosts updated. Original contents retained as /root/.ssh/known_hosts.quondam        

Yous tin use either of the above given method to remove the host key so attempt connecting once more. You lot tin use the same ssh control to connect remote host and tin can run into that you lot are not getting this "host primal verification failed" fault once again.

root@localhost:~#          ssh root@192.168.0.106          The authenticity of host '192.168.0.106 (192.168.0.106)' can't be established. ED25519 fundamental fingerprint is SHA256:mx1ctmvoleWzmA3kVqOr+H9uIMQFPsK9eTXlnJ5fnGA. Are y'all sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.0.106' (ED25519) to the list of known hosts. Password: Concluding login: Sat May 23 23:54:31 2022 from 192.168.0.101 NOTE: organisation has i active alert; run 'fmadm listing' for details. Oracle Corporation SunOS 5.11 xi.4 Aug 2018        

At that place is one more than mode to avoid "host key verification failed" error past disabling the host central check. This tin be done by setting StrictHostKeyChecking option every bit no while using ssh command to connect remote host. This can be seen from below example.

root@localhost:~#          ssh -o 'StrictHostKeyChecking no' root@192.168.0.106        

NOTE:

Please do not permanently set StrictHostKeyChecking to no without knowing your organisation completely as this might create major security breach and make your arrangement vulnerable for Trojan attacks. By default you will come across this option set up to yes

At present that we are able to login into the remote host. So permit's try to copy the public key again and check but before that nosotros need to exit out from the remote host using get out control.

root@localhost:~#          leave          logout Connectedness to 192.168.0.106 closed.        

Equally done to a higher place, we will again try to copy the ssh public key to remote host 192.168.0.106 using ssh-copy-id root@192.168.0.106 command and will see if it works this time.

root@localhost:~#          ssh-copy-id root@192.168.0.106          /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub" /usr/bin/ssh-re-create-id: INFO: attempting to log in with the new key(due south), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you lot are prompted now it is to install the new keys Password:  Number of key(due south) added: ane  Now try logging into the machine, with: "ssh 'root@192.168.0.106'" and check to make sure that only the central(s) yous wanted were added.        

By seeing the above output, you can be certain that information technology is working fine at present and no other error is visible.

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Source: https://www.cyberithub.com/ssh-host-key-verification-failed-error-in-linux/

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