If you don't see the server, execute the following in a command line prompt (Start\Run..., type
cmd and click on OK):
netsh interface ipv4 show interfaces
You'll see something like:
Idx Met MTU State Name
--- ---------- ---------- ------------ ---------------------------
1 50 4294967295 connected Loopback Pseudo-Interface 1
13 20 1500 connected Local Area Connection
If you know which one is the connection you're using tell me the MTU value, else just paste the whole thing.