OpenSSH 3.9 server (packaged by HP - HP-UX Secure Shell-A.03.91.002) /
PuTTY 0.56 client / DSA 1024 key...

Any reason why a tunneled port would work when I use password auth. and
not work when I use public/private keys for auth?
The use of a key doesn't seem to make a difference when using an OpenSSH
client, only with PuTTY. Here's a snapshot of the log file dumped by
PuTTY.

---snip---
Event Log: Opening forwarded connection to localhost:5555
Outgoing packet type 90 / 0x5a (SSH2_MSG_CHANNEL_OPEN)
00000000 00 00 00 0c 64 69 72 65 63 74 2d 74 63 70 69 70
.....direct-cpip
00000010 00 00 01 01 00 00 40 00 00 00 40 00 00 00 00 09
......@...@.....
00000020 6c 6f 63 61 6c 68 6f 73 74 00 00 15 b3 00 00 00
ocalhost.......
00000030 16 63 6c 69 65 6e 74 2d 73 69 64 65 2d 63 6f 6e
..client-side-on
00000040 6e 65 63 74 69 6f 6e 00 00 00 00 nection....
Incoming packet type 92 / 0x5c (SSH2_MSG_CHANNEL_OPEN_FAILURE)
00000000 00 00 01 01 00 00 00 01 00 00 00 0b 6f 70 65 6e
............open
00000010 20 66 61 69 6c 65 64 00 00 00 00 failed....
Event Log: Forwarded connection refused by server: Administratively
prohibited [open failed]
---/snip---


Never seen this behavior before...


-Carl