Able to clone https repo. Unable to clone SSH repos

Hi Support,
As we are facing problems with Git SSH clone.
HTTPS works fine.

Connections:
checked connections to server with: Telnet, nmap: works fine for 443 and 22

Keys:
Added public keys under user settings.

Error:
ssh: connect to host 10.144.3.46 port 22: Connection timed out
** fatal: Could not read from remote repository.**
** Please make sure you have the correct access rights**
** and the repository exists.**

Can you guys help us here with suggested steps.

Many Thanks!
Srikanth
Genmab