No active mode any more, everyone else in network is able to load

Hey community,
I was able to use DC++ for about 1 month without any problems.
From one to the next day it only sets up the passive mode with the error:
"Local network with possible NAT detected, trying to map the ports...
Port mapping: Failed to map the Transfer port (59341 TCP) with the NAT-PMP interface
Port mapping: Failed to initalize the MiniUPnP interface
Port mapping: Failed to map the Transfer port (59341 TCP) with the Windows UPnP interface
Port mapping: Failed to create port mappings
Active mode could not be achieved; a manual configuration is recommended for better connectivity"

Since every one else in the network is still able to use DC++ it seems to be a local problem.
I use win 7 x64 and tried the UPnP Test Program which is recommended on many web links.

The output acknowledges my suggestion:
"TEST 1 - Operating System Support - PASSED
TEST 2 - SSDP Service Running Check - FAILED
TEST 3 - SSDP Service Automatic Check - FAILED
TEST 4 - UPnPHost Service Running Check - FAILED
TEST 5 - UPnPHost Service Automatic Check - FAILED
TEST 6 - UPnP Framework Firewall Exception Check - PASSED
TEST 7 - Adapter #0 - 192.168.48.1 - FAILED
TEST 8 - Get External IP Address - FAILED
TEST 7 - Adapter #1 - 10.12.169.8 - FAILED
TEST 8 - Get External IP Address - FAILED"

But the SSDP and UPnPHost Services are automatic on my system and are running. Furthermore is DC++ added to my Firewall, respectively I even deactivated it without any advantage.

Is there a way to figure out which program blocks or uses a service?

It seems that this happend after I installed Visual Studio 2010 Pro complete, so maybe some SQL Server or whatever could possibly block the services?!

Thanks for your help in advance!