RDP through reverse ssh tunnel fails

[Nixon T Murdock III]

Hi there, happy new year!

Has anyone encountered the following? Much Googlage hasn't turned up much
to go on.

I'm connecting from a WinXP PC "at the office" (for the want of a simpler
explanation) from which I can SSH to "unix.branch-office.net" (using Putty,
if you really wanted to know).

What I'm trying to do is "push" my workstation's local tcp/3389 to
"unix.branch-office.net", so that I can then use the RDP-client to connect
to unix.branch-office.net:3389 from it's own local subnet. The ssh syntax
for those that care is -R 3389:localhost:3389, with "allow other hosts"
set.

Anyway, this works - but only as far as the logon screen, once through
logon it freezes dead. Remote desktop works fine "in the office", so I
know it ain't that, and other tunnelled protocols seem to work OK.

I've tried specifying all sorts of things in the -R ssh syntax: localhost;
127.0.0.1; 192.168.0.12; but nothing will get me through.

Many thanks in advance for any pointers and tips.

Nix