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Remove ssh key pair generated - Linux

Hi experts, I made a setup ssh key-pairs between two servers.
It worked well, but now I want to delete it.
The problem is that as it is now prompted for authentication locally to the application when trying to run a script for it. For example to run a stop_app, asks me to enter the user password ( should not ).
Here are the steps I did:
server_1:/home/user/> ssh-keygen -t rsa

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I not joined the "passphrase" twice, then 2 files were generated:
id_dsa
id_dsa.pub

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I copied id_dsa_pub to the server_2:
server_1:/home/user/scp id_rsa.pub user@server_2:/home/user/.ssh/

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Prior backup, renamed it id_rsa.pub:
server_2:/home/user/cp -p authorized_keys authorized_keys_bkp
server_2:/home/user/mv id_rsa.pub authorized_keys

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I grant permission to the new file:
server_2:/home/user/chmod 644 authorized_keys

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To try to remove the entries, I tried on both servers:
ssh-keygen -R hostname

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without positive results.
Then, when I returned to the previous file, "autorized_keys", I try:
server_1:/home/user/>ssh user@server_2:/home/user

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I see the message:
ssh server_2:/home/user: Temporary failure in name resolution

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I did not make a backup of known_hosts.
What are the correct steps to roll back the configuration?
Tkankyou in advanced, regards.
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carlino70
Asked:
carlino70
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1 Solution
 
gheistCommented:
It is a problem with DNS server or DNS records, nothing to do with authorized keys files.
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carlino70Author Commented:
I had to regenerate the keys, using a resident script in my /home, which updates the authorized_keys and known_hosts files. It is based on the list of users and network nodes.
This for all users.
With this I could solve the problem.
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gheistCommented:
sssh-keygen 4096
cat .ssh/id_rsa.pub | ssh user@host tee ~/.ssh/authorized_keys
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carlino70Author Commented:
Thanks!
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