Resolution:
* Workflow server:

1. In the &ltbwc>/server/config/IcServer.srv file set the parameter:
IC_SERVER_DEBUG_ENABLED=ON
(by default it's set to  OFF)
IcStart will add IC_SERVER_DEBUG environment variable automatically.

2. review the debug log is generated under &ltbwc home>/server/logs directory after the Workflow server is been re-started.

3. You can also add the following to IcTSMstartServer_env.sh file –

DEBUG=”ON”
export DEBUG
This should give additional information at the console where you are starting the server.

* Document Repository Server:

1. Open $IC_HOME/config/IcRepDaemon.config in a text editor.
Uncomment the debug instruction:
DEBUG=/home/hostname/ic_home/server/server_name/logs/repd_debug.log.
2. Uncomment one of the LOG-LEVEL settings. By default, LOG-LEVEL=error is
uncommented. Turn off this setting and turn on LOG-LEVEL=debug.
3. Make any other changes if necessary, save the file, and exit the editor.
4. Shut down the repository server.
5. Start the repository server.
6. Repeat the failing operation.
7. View the log files in $IC_HOME/logs/repserver.log.
8. Troubleshoot as required.
After you diagnose the problem, remember to disable the debugger by turning off
the DEBUG= instruction in IcRepDaemon.config.

How to enable detailed logging for workflow server and Document Repo server running on unix box?