DataStage Director Can't open (IS 8.1)

Problem:
The job can be created using DS Designer and compiled as well. But, while opening in the Director, the error message was thrown like below:
Error calling sunroutine DSR_EXEJOB ( Action=5); check Datastage is set up correctly in project SBIDEMO ( The connection is brocken (81002))

Cause:
The Director crashes with an 81002 error when a job is invoked and log view is selected even though you can login to the Designer and create and compile a job. The issue occurs if the jobmon (px engine job monitor) application crashes or is not running (in our case it crashed with nothing in its log file after running several jobs successfully) and is due to the changes introduced with 8.1 that direct DataStage logging to xmeta instead of the local DSEngine log files.

Resolution:
It is possible to revert to the old 8.0.1 functionality by setting the following project level
parameters in the DSParams file to the following values:

RTLogging=1
ORLogging=0

After making the switch back to DSEngine level logging an error will be logged in the job log indicating that the job monitor is not running but the job will run to completion: main_program: Failed to initialize job monitoring. Monitor information will not be generated.
The job monitor can be started manually via the following steps while in the InformationServer/Server directory:

# . ./DSEngine/dsenv
# ./PXEngine/java/jobmoninit start