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

Open in new window

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

Open in new window

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

Open in new window

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

Open in new window

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

Open in new window

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

Open in new window

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

Open in new window

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

Open in new window

I did not make a backup of known_hosts.
What are the correct steps to roll back the configuration?
Tkankyou in advanced, regards.
carlino70Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

gheistCommented:
It is a problem with DNS server or DNS records, nothing to do with authorized keys files.
0
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.
0
gheistCommented:
sssh-keygen 4096
cat .ssh/id_rsa.pub | ssh user@host tee ~/.ssh/authorized_keys
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
carlino70Author Commented:
Thanks!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Linux

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.