[Info-vax] TCPIP RWAST

[Dave Froble]

On 3/9/2021 4:20 PM, Jeffrey H. Coffield wrote:
>
>
> On 03/09/2021 12:05 PM, Stephen Hoffman wrote:
>> On 2021-03-09 19:48:05 +0000, Jeffrey H. Coffield said:
>>
>>>  FIN_WAIT_2
>>
>> Some number of connections in that state is to be expected, pending
>> timeout.
>>
>> App crashes or network disconnections or misconfigured firewalls can or
>> will exacerbate those numbers.
>>
>> https://benohead.com/blog/2013/07/21/tcp-about-fin_wait_2-time_wait-and-close_wait/
>>
>>
>>
>>
> This may be the answer, I checked all the other vms systems I have
> access to and the number of FIN_WAIT_2 connections is 0 to 2. The system
> in question has 975.
>
> I have a conference call with with the network people today. I'll update
> this thread with any results.
>
> Many thanks
> Jeff

Might be something there, especially with the history.

I believe your wait is what TCP/IP does before taking down the device. 
Noise on the network, not sure what that might be, could be keeping the 
devices allocated.

We have had some issues with the timeout in the past.  Might have 
changed parameters to make the timeout shorter.

I'm wondering if a duplex mismatch could cause such problems?

-- 
David Froble                       Tel: 724-529-0450
Dave Froble Enterprises, Inc.      E-Mail: davef at tsoft-inc.com
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