Always sudden network down on SCO box :(

[eepico]

Dear all,

I have a SCO Openserver 5.0.5 and it always encounter a sudden network down problem. All the connected terminals are kicked out but the console is still working fine. It only kicked out the terminals connected to that local box but not for the box in other side of the router. I guess it is the problem on the network card or its cable or some background daemons. Is there any other hints? How can I check them are in good condition or not?

Jack

 

[edfair]

ping or tracert from the terminal.
ifconfig -a from the SCO box to see what it thinks is running.
ping a terminal from the SCO.
Should give you some idea where to go. Ed Fair
unixstuff@juno.com
Any advice I give is my best judgement based on my interpretation of the facts you supply. Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.

 

[Megabitman]

I'll beg the question... how are the terminals (are they really terminals or pcs emulating terminals?) connected? If the terminals are connected to a terminal server, perhaps the issue is as easy as power fluctuations affecting the terminal server or other device handling the terminals. If you provide a bit more info, it may be that someone can help you.

 

[eepico]

Thanks, but this box is in other site not in my own office... I need to go to their site to do what you told me to do above once this problem occur again. Is there any pre- or post-action I can work on? Coz once this problem occur they will reboot the box and then everything goes normal.

The terminals are just PCs running telnet emulations. If power was fluctuating, then all the terminals will reboot itself not just freeze then disconnect, isn't it, and the server has UPS to protect the fluctuations.

 

[edfair]

Two network cards? One for router and one for a hub? Sounds that way from the description. The local terminals die and the remote terminals are OK. Ed Fair
unixstuff@juno.com
Any advice I give is my best judgement based on my interpretation of the facts you supply. Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.

 

[eepico]

Nope, the PC terminals, router and server are all in a local hub and the remote server is on other district throught a data line connected the routers on both side. My case is only the connection of local terminals to local server dropped, all network devices were fine. Thank God!

 

[SARUN]

Hi,

I've a similar problem as Jack, in SCO 5.0.4, There are dumb terminals connected to the server by Terminal Server and PC's using telnet. Both are disconnected and only the console is running. I've checked the ps, which shows the sessions are active.

This occurs very rarely and restart solves the problem temperarily. But I've not found the long term solution. As Megabitman speculated I too am doubting as power fluctuation of the terminal server.I'm still trying to convince my maintenance guys to look up the power point of the Terminal Server.

but i'd also try edfair's suggestions, maybe it might throw something else. I'll post the reults.

Arun

 

[Slick629]

Run a netstat -m and see if there are any failures in the fail column when the sessions are kicked out. If there are then you need to modify the streams memory.