Resolution:
To verify that your DBMS server is up and running, use the DBMS's SQL facility
(isql for Sybase; sqlplus for Oracle) to see if you can connect to the DBMS from
the InConcert server machine. Be sure to set your database environment variables as you specified them to the InConcert installation scripts, and to use the same database name, user name, and password that you specified to the InConcert installations scripts. Do the login from the InConcert host.  If the SQL connection fails, you have isolated the problem to be a database problem, not an InConcert problem.

If any error is seen when logging in to Oracle via sqlplus have the customer fix that problem. The InConcert server terminates on any error received from the DBMS. Relinking Oracle executables may fix their problems.  

If the database error happened during IcInstall it will be recorded in /tmp/IcDbError.log
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If this is an upgrade, you could get this error message if you left the old InConcert server running.

Stop the old server and restart IcUpgrade
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You could get this error message if you have two Oracle tablespaces with the same
username and password.

Delete one tablespace, or create a new one with a unique username and password.