GRMG Monitoring For ADS Returns HTTP 500

Hi fellows,

we have a CRM 7.0 system running. I am desperately trying to set up GRMG monitoring for Adobe Document Services according to this documentation:

http://help.sap.com/saphelp_crm700_ehp03/helpdata/en/de/9bdb4064da712ae10000000a155106/frameset.htm

However all I get in RZ20 in the "Availability and Performance Overview" monitor is a HTTP communication failure with a HTTP 500 status code in the corresponding "Run Status/Error Messages" node. Any ideas?

Best regards,

Michael