Hello,
Is the SEPM installed on the Windows 7 machine?
Make sure the Windows Firewall and UAC are turned off and disabled.
OR
>> Are you trying to access the Symantec Endpoint Protection Manager via Symantec Endpoint Protection Manager Java console?
Check this Article:
SEPM Remote Console access fails with "Unexpected server error. [0x10010000]"
http://www.symantec.com/docs/TECH191010
OR
Are you talking a Remote Desktop to the SEPM server and then trying to Login?
Make sure you have take a Remote Desktop Console session (Session ID: 0)
Hope that helps!!