Teamcenter Login Issue : ITK_internal_error : Unclassified error/exception:See system log file for possible explanation.

Today, I was trying to execute the batch program to fetch the item .Program was working previously  but it got failed with following exception
 ITK_internal_error:Unclassified error/exception:See system log file for possible explanation.

Then I tried to login using Teamcenter and faced the same error 



So, I checked the syslog file some of the statement was 

Teamcenter Engineering could not connect to the DBMS specified in the
TC_DB_CONNECT environment variable.
This could be because the DBMS is not online or the server
is not accessible from your node.

and 


ITK_init_module_prelogin failed - Teamcenter.CoreModelGeneral.tc at D:\workdir\tc10132x_win64\src\core\tc\infomanager_itk.cxx(1980)

So I tried to login DB using command prompt 
>sqlplus

and provided the user as infodba and it has shown that password has expired so I changed it to same password and it worked.

Note : Before starting Teamcenter close all the TAO window and run genregxml.bat available at location TC_ROOT/portal/registry