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From: jmr1@Ra.MsState.Edu (Mike Rackley)
Newsgroups: comp.dcom.sys.cisco
Subject: Terminal server hangs
Message-ID: <35086@boulder.Colorado.EDU>
Date: 14 May 91 23:44:44 GMT
Sender: daemon@boulder.Colorado.EDU
Lines: 32

For months we have been chasing the following problem.  We had it with
our original csc2 processor and are having it with our recent csc3
upgrade.  We are running 8.2(2) software, but we saw the same problem
with previous versions of the software.

The problem is that output coming back to dial up terminals through the 
terminal server will hang for anywhere from 30 seconds to 2 minutes at a 
time.  Once output resumes, it will run fine for varying lengths of time
and then hang again.  On bad days, a user might see such hangs every few
minutes.  The problem occurs regardless of which host the terminal user
is telnetted to.  Users have complained of it when logged in to Sun
SPARCserver 490's, Vax 780's and UNISYS 1100's.  The most annoying
manifestation of the problem is while the host is echoing keyboard
input back to the terminal.  The user can continue typing, and the host
will continue accepting the input, but the user won't see his input
echoed back to the terminal until the hang condition clears.

Last week, cisco customer support called and said that another user at
another site had complained of an identical problem.  He finally tracked
it down to the fact that the terminal server ethernet port was connected
to a transceiver that had SQE enabled.  When SQE was disabled, the
hanging problem went away.  We checked our transceiver and SQE was
disabled.  For good measure, we switched to another transceiver with SQE
disabled and the hangs stayed with us.

Has anyone out there seen a similar problem?  And more importantly, does
anybody have a clue as to what might be going on and how to fix it?


Mike Rackley, Mississippi State University
Internet: jmr1@CC.MsState.Edu    Bitnet: JMR1@MsState
Phone:    (601)325-7028          FAX:    (601)325-8921