Resolution:
Confirm that the debug enabling is off in the IcServer.srv / false in icconfig.xml.

If using non-default rv parameters set the following correctly before running the debug option:
IC_TIBRV_DAEMON=tcp:&ltdaemon_port>
IC_TIBRV_SERVICE=&ltservice_port>
IC_TIBRV_NETWORK=&ltnetwork>

To turn the debug on (file will be created at the default location i.e. logs folder / as specified in the config file):
>> ./IcDebugControl -i &ltDispatcher Name> on -icclient icdba/icdba@&ltWorkflowServerName> (Use the group name in case using FT mode)

To turn Off:
>> ./IcDebugControl -i &ltDispatcher Name> off -icclient icdba/icdba@&ltWorkflowServerName> (Use the group name in case using FT mode)

If the above doesn't work try the following:
cd $&ltWF_Server_HOME>/bin
export IC_CLIENT=icdba/icdba@&ltWF_Server_Name> (Use the group name in case using FT mode)
./IcDebugControl -i &ltDispatcher Name>  -c on -f "/tmp/icdebug.log" (Replace on with off if you want to stop the debug entries being made to the file)