One of my db_links started to act up.
I am getting 'ORA-12203: TNS:unable to connect to destination' error.
I am able to TNSPING db name I am attemting to connect to through db link.
When I do PING (ip address) dos screen displays:'Request timed out'.
I know ip address has not changed. There was some work done on the the database I am trying to reach. I am not sure what they've done.
Please bring the light to this problem.