After many months of perfect operation, the transparent telnet proxy I
had configured just broke. I can telnet to the remote host from a
public machine, so I know the remote host is responding. I have
unloaded the filters and updated the IP stack (and rebooted) to no avail.

However, if I use sockclnt.nlm on the BM server, I can't connect to the
remote host. If I telnet from a workstation and capture the data for
analysis in Ethereal, I get a TCP ZeroWindow every time I attempt to
telnet from the workstation, which the docs tell me means that the
remote host didn't grab the data off the wire in a timely fashion.

My server is NW65SP2, and BM38 with the patches and proxy.cfg from
Craig's website.

Any ideas where to look next?