SCO Unix breaking Telnet connections.

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3 total messages Started by Phil Trubey Thu, 31 Jan 1991 04:03

#34

Author: Phil Trubey
Date: Thu, 31 Jan 1991 04:03

18 lines
1118 bytes

I have this annoying problem with my SCO Unix machine.  Every once in
a while when I'm logged in via a Telnet session, the Unix machine just
drops my connection.  In fact it drops all telnet connections from 
my machine if I have multiple connections outstanding (I use PC/TCP from
a PC to telnet in).  When it drops the connections, my session just
freezes until PC/TCP realizes that the other end is not talking anymore
and then lets the connection go.  After dropping my connections, I can't
initiate new connections - it just times out.  A few minutes later I can
initiate new connection and continue as if nothing happened.

Any ideas on what might be causing this?

Thanks,

-- 
Phil Trubey
SHL Systemhouse Inc.
(Internet: phil@shl.com      UUCP: ...!uunet!shl!phil)

Re: SCO Unix breaking Telnet connections.

#35

Author: Tom Fitzgerald
Date: Fri, 01 Feb 1991 00:01

19 lines
1157 bytes

phil@shl.com (Phil Trubey) writes:
> I have this annoying problem with my SCO Unix machine.  Every once in
> a while when I'm logged in via a Telnet session, the Unix machine just
> drops my connection.

One problem is, apparently SCO's rlogin and telnet demons will die horribly
if a "suspend" character comes across the line.  As shipped, this is a
null (^@) character and you can trash your session by typing a control-space
on most workstations.

To avoid this, "stty susp '^-'" in your .profile or /etc/profile if you're
telnetted in.

This sounds only vaguely like your problem though.  If it doesn't apply,
never mind.

---
Tom Fitzgerald   Wang Labs        fitz@wang.com
1-508-967-5278   Lowell MA, USA   ...!uunet!wang!fitz

Re: SCO Unix breaking Telnet connections.

#36

Author: E.J. Leoni-Smith
Date: Wed, 06 Feb 1991 22:28

32 lines
2148 bytes

phil@shl.com (Phil Trubey) writes:

>I have this annoying problem with my SCO Unix machine.  Every once in
>a while when I'm logged in via a Telnet session, the Unix machine just
>drops my connection.  In fact it drops all telnet connections from 
>my machine if I have multiple connections outstanding (I use PC/TCP from
>a PC to telnet in).  When it drops the connections, my session just
>freezes until PC/TCP realizes that the other end is not talking anymore
>and then lets the connection go.  After dropping my connections, I can't
>initiate new connections - it just times out.  A few minutes later I can
>initiate new connection and continue as if nothing happened.

>Any ideas on what might be causing this?

I have seen similar behaviour on another TCP/IP : My guess - and it 
is only a guess - is that you might be seeing two packets hitting
the ethernet adapter in quick succesion, the second whilst the first
is still being processed under interrupt. Then the driver exits the ISR
clears down the interrupt - and maybe doesn't reset the hardware correctly.
I have written bad hardware interface code like this om several occasions.

You don't say what hardware you are using: I have heard rumours of this 
behaviour with certain intelligent cards...but no more than that.

In my case it happened on a development release on a WD8003 - but so 
infrequently that it was not a problem. Sometimes Heavy NFS would
cause it, and it would sometimes clear if i sent an outbound packet -
sometimes not - needed reboot.

I am intereseted in further detail. I run the support dept of a company
that has to support connections TO SCO (we don't sell that) so if I can
get info - it saves ME time!

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