<b>drh</b>, now it works.<verbatim>C:\Projects>fossil clone fossil.fossil
                Bytes      Cards  Artifacts     Deltas
Sent:              53          1          0          0
Received:     4003936       2879        255       2622
Sent:             651         26          0          0
Received:     4114679       2700        946       1736
Sent:              56         17          0          0
Received:     4093181       2864       1139       1723
Sent:              56          1          0          0
Received:     4719404        234        102        130
Sent:              56          1          0          0
Received:     3142843        850        386        462
Total network traffic: 1217 bytes sent, 7002624 bytes received</verbatim>
Actually it started working almost immediately after this:

I'm using an ADSL router to connect to the Internet, I have no firewall, no AV software, no other active network interfaces. Also I have WinPCap installed but I don't think it can cause any problems.

As for [052de1d35b] I've sent you an email with --httptrace.