Happy I could help you, it took me a while to figure out what was going out (but not 4 years ok :D)
If you want to play, here is the explanation of those registry keys:...

Here it is:
239005

I also added those two keys:
PortsInternetAvailable = Y
UseInternetPorts = Y
in addition to Ports = 5000-9000
in
HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet

I had the same problem, and it appeared there is a registry key limiting the number of RPC ports to be opened:
HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet
The value set for me was...