"Database Signon: Invalid user ID or password for database signon. (id=sysadm)."What if you configure the domain within an appl user like PS/PS ?
user PS lacks CREATE SESSION privilege; logon deniedPS (as an Oracle user) is not granted to connect onto the db, nothing wrong here, it is perfectly expected.
ORA-12545: Connect failed because target host or object does not existWhat heppen if you just try to ping the db server from app server ?