SSH terminal locking up from OS X to FreeBSD

[Jim Freeze]

* Chad Leigh -- Shire.Net LLC <chad at shire.net> [2005-02-22 22:58:17 -0700]:

> Just for giggles, what happens when you try a different encryption 
> method with the ssl client?  For example,  -c blowfish

Ok, so I tried this, but it still locks up. However, I was 
able to do <RETURN>~C to get a command line and <RETURN>~^Z to
background the ssh terminal, but I was never able to re-activate
it.

I did manage to log the IP activity through tcp dump, and I discovered
that after the 'lock up', there are no IP messages originating
from the remote machine. Also, the IP blocks are of type FP,
whatever that is. (Hmm, maybe I need to clear out the known hosts
on the remote machine.)

An abbreviated version is below.
The full log file is at:

  http://www.freeze.org/tcpdump3b.log

00:22:59.999439 IP localhost.53245 > remotemachine.com.ssh: S 611378943:611378943(0) win 65535 <mss 1360,nop,wscale 0,nop,nop,timestamp 1996513030 0>
00:23:00.053942 IP remotemachine.com.ssh > localhost.53245: S 77400915:77400915(0) ack 611378944 win 57344 <mss 1460,nop,wscale 0,nop,nop,timestamp 1100668230 1996513030>
00:23:00.054039 IP localhost.53245 > remotemachine.com.ssh: . ack 1 win 65535 <nop,nop,timestamp 1996513030 1100668230>
00:23:00.331844 IP remotemachine.com.ssh > localhost.53245: P 1:24(23) ack 1 win 57964 <nop,nop,timestamp 1100668258 1996513030>
00:23:04.922358 IP localhost.53245 > remotemachine.com.ssh: . ack 3512 win 65535 <nop,nop,timestamp 1996513040 1100668711>
# Long break - remote terminal stops responding but data is still flowing as you can see.
# <RETURN>
00:34:05.662885 IP localhost.53245 > remotemachine.com.ssh: P 1519:1559(40) ack 3512 win 65535 <nop,nop,timestamp 1996514361 1100668711>
00:34:07.284836 IP localhost.53245 > remotemachine.com.ssh: P 1519:1559(40) ack 3512 win 65535 <nop,nop,timestamp 1996514364 1100668711>
00:34:09.285235 IP localhost.53245 > remotemachine.com.ssh: P 1519:1559(40) ack 3512 win 65535 <nop,nop,timestamp 1996514368 1100668711>
00:34:43.290382 IP localhost.53240 > remotemachine.com.ssh: FP 0:48(48) ack 1 win 65535 <nop,nop,timestamp 1996514436 1100663377>
# <RETURN>~?
00:35:09.294870 IP localhost.53245 > remotemachine.com.ssh: P 1519:1719(200) ack 3512 win 65535 <nop,nop,timestamp 1996514488 1100668711>
00:37:17.308387 IP localhost.53245 > remotemachine.com.ssh: FP 1519:2655(1136) ack 3512 win 65535 <nop,nop,timestamp 1996514744 1100668711>
#Closed terminal

-- 
Jim Freeze