SUM :"Unable to locate the requested resource"

Symptom:

SUM launching error -Unable to locate the requested resource.

Solution :

1. Stop the SAP Hostagent with saphostagent -stop

2. Check that there are no running processes which belong to SAP Host Agent, and kill any remaining Host Agent's sapstartsrv processes.

3. Delete the /tmp/.sapstartsrv99_sapstartsrv.log and content of the Host Agent's work directory

4. Stop the saphostwatcherservice also

5. Launch the SUM again

Also you can refer the below SAP Note :

2475146 - SUM : logon via SAP Host Agent is failing "Unable to locate the requested resource"

Hope this helps!!!

Abraham