Teamcenter: "ITK_internal_error: Unclassified error/exception"

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