SCP Problem

[Kurt Wall]

Hola, list,

I have an interesting problem. The short version is that there is host
out there into which I can ssh without incident from my systems here
at KurtWerks (using either password or public key authentication - I 
use public keys). I can also ssh back to KurtWerks. Similarly, from the
remote host, I can scp files to and from KurtWerks. 

The problem, though, is that scp from KurtWerks to the remote system, that
is, when KurtWerks is the orgin of the scp session, will not work. I
start the session, authenticate, and then it stops. No data is
transmitted. When I turn debugging with scp -vvv, the last few lines
read like so:

debug1: Sending command: scp -v -r -p -d -t /usr/www/users/kwall
debug2: channel 0: request exec confirm 0
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 131072 

That last line is the last thing I see; 10 minutes later, it hasn't
moved and I just kill the session with Ctrl-c. I ran an strace on the
scp session, and the last few lines look like so:

rt_sigaction(SIGTERM, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGTERM, {0x80001d50, [], 0}, NULL, 8) = 0
rt_sigaction(SIGINT, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGINT, {0x80001d50, [], 0}, NULL, 8) = 0
rt_sigaction(SIGHUP, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGHUP, {0x80001d50, [], 0}, NULL, 8) = 0
read(7,

Yes, that's an incomplete read() syscall because that's where the strace
output stops. Finally, running a tcpdump on the session, I see much the
same thing: session initiation followed by authentication, and then
nothing. Again, the last few lines of tcpdump's output:

02:06:22.710183 IP latte.local.51303 > the.remote.host.ssh: P
2238:2366(128) ack 2088 win 93 <nop,nop,timestamp 2640818 4136540140>
02:06:22.749597 IP the.remote.host.ssh > latte.local.51303: P
2088:2136(48) ack 2366 win 32942 <nop,nop,timestamp 4136540183 2640818>
02:06:22.789387 IP latte.local.51303 > the.remote.host.ssh: . ack 2136
win 93 <nop,nop,timestamp 2640838 4136540183> 

I'm stumped for how to proceed. Suggestions welcome and thanks.

Kurt
-- 
You prefer the company of the opposite sex, but are well liked by your own.