Symptom: Unable to login to Teamcenter Rich Client. ITK_internal_error: Unclassified error/exception. See system log file for possible explanation. CAUSE: This error usually occur when connected to VPN.
Solution: 1.The oracle listener was not running.
2.In this case, on the Windows server, in the Services window, e.g. the administrator had to restart the oracle listener service OracleOraDb11g_home1TNSListener 3.Restart Oracle Listener. 4.If restart listener doesn't work, i. Delete listener iii. Goto cmd -> sqlplus infodba/infodba@DBNAME ii. Create listener iv. shutdown immediate v. startup mount