ssh remote host identification has changed

Question

I\'ve reinstalled my server and I am getting these messages:

[user@hostname ~]$ ssh root@pong
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@           


        

Answer 1

The sledgehammer is to remove every known host in one fell swoop:

rm ~/.ssh/known_hosts

---

I come up against this as we use small subnets of short-lived servers from a jump box, and frequently have internal IP address reuse of servers that share the same ssh key.

Answer 2

Simply clear the known_hosts which is present in /home/{username}/.ssh/known_hosts

vi /home/{username}/.ssh/known_hosts 

remove every line inside known hosts and exit after that you will be able to login.

OR

run this command

ssh-keygen -R "hostname/ip_address" 

Answer 3

Here is the simplest solution

ssh-keygen -R <host>

For example,

ssh-keygen -R 192.168.3.10

From ssh-keygen man page:

• -R hostname Removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts (see the -H option above).

Answer 4

I used the solution of mockinterface, though the sed -i didn't quite work I solved it by deleting the line by hand with vim:

sudo vim /var/lib/sss/pubconf/known_hosts

You can use any other text editor you want, but probably you'll need to show your administrative privileges

Answer 5

Use this command:

truncate -s 0 /home/SYSTEM_NAME/.ssh/known_hosts