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winperezFlag for United States of America

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AS 400 and Terminal Sessions

I am using Mocha @32 TN5250 to connect to an IBM AS400. Lately users are complaining that their sessions are freezing up a lot of times during the day.
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Gary Patterson, CISSP
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Well, this can be a result of performance problems on the AS/400, Windows issues, or network/communications issues.  

As always, a good question to ask is "what changed"?  You say "lately".  Did anything change in your network or on the AS/400 around the time of the change?  

Did you apply patches or service packs to the workstations that are experiencing problems?  If so, try rolling back one of the workstations that is experiencing trouble and see if that alleviates the problem.

If your AS/400 is experiencing performance issues, that can certainly cause long response times that might look to users like the application is freezing.  Are you experiencing AS/400 performance troubles?

Network issues, including routing problems, VPN problems, duplicate IP addresses, duplicate MAC addresses, firewall problems, failing network adapters, failing switch or router ports can also cause these problems.  

Questions and suggestions:

1

When you say "freezing", what exactly do you mean?  Do they go to "Not Responding" status in Windows?  Do they get the "locked" 5250 indicator and just stay there?
How often does the problem happen?  
Is it happening to all AS/400 users, or just certain ones?  
What happens if you PING the as/400 from one of the problem workstations during a trouble period?
Does it only happen during certain times of the day?
Check the event log on a problem PC.  Are there any meaningful events that correspond to the "freeze times"?
Check the QHST and QSYSOPR message queues on the AS/400 for related messages, too.
- Gary Patterson
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JohnSQL
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Thought he said "freezing", not "dropping".

winperez, could you please clarify what exactly is happening?

- Gary