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MQSeries.net Forum IndexGeneral IBM MQ SupportChannel 'SYSTEM.DEF.SVRCONN' Ended Abnormally.

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josec
PostPosted: Tue May 22, 2018 8:14 am Post subject: Channel 'SYSTEM.DEF.SVRCONN' Ended Abnormally. Reply with quote

Newbie

Joined: 22 May 2018
Posts: 2

Greetings,

I'm getting the following error:

5/14/2018 17:23:49 - Process(11420.2961) User(MUSR_MQADMIN) Program(amqrmppa.exe)
Host(server) Installation(Installation1)
VRMF(7.5.0.2) QMgr(QM_ESB)

AMQ9999: Channel 'SYSTEM.DEF.SVRCONN' to host 'server (ip)' ended
abnormally.

EXPLANATION:
The channel program running under process ID 11420(18600) for channel
'SYSTEM.DEF.SVRCONN' ended abnormally. The host name is 'server
(ip)'; in some cases the host name cannot be determined and so is shown
as '????'.

It tells me to check previous messages and they shows this:

AMQ9513: Maximum number of channels reached.

The maximum number of channels that can be in use simultaneously has been reached. The number of permitted channels is a configurable parameter in the queue manager configuration file.

Wait for some of the operating channels to close. Retry the operation when some channels are available.

The MaxChannel count is set to 1000 on the qm.ini file.

Can someone help me on identifying the root cause?
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exerk
PostPosted: Tue May 22, 2018 8:27 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 5955

The root cause is that the maximum number of active channels has been reached, so you need to identify which client application is racking up the most connections and is either not closing them correctly, or it needs more connections than you have set currently.

Also, using SYSTEM.DEF.SVRCONN is a really, really BAD idea - give each application its own, then if one goes totally tonto and spawns new connections such that you hit MAXACTIVE again, you can 'kill' that one connection without affecting others.
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys.

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gbaddeley
PostPosted: Tue May 22, 2018 5:35 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1898
Location: Melbourne, Australia

exerk wrote:
Also, using SYSTEM.DEF.SVRCONN is a really, really BAD idea - give each application its own, then if one goes totally tonto and spawns new connections such that you hit MAXACTIVE again, you can 'kill' that one connection without affecting others.

Agree. Create separate SVRCONN type channels for each app and set MAXINST and MAXINSTC to reasonable values. Set the security parameters appropriately. Each channel should have a unique MCAUSER setting, and MQ authority profiles set up to limit access to objects based on group memberships.
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Glenn
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josec
PostPosted: Wed May 23, 2018 4:20 am Post subject: Reply with quote

Newbie

Joined: 22 May 2018
Posts: 2

Thanks for the suggestions. I didn't have any part in the design of this system, so I'm not sure how the company will proceed, but I'll show them this comments so they can evaluate.
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gbaddeley
PostPosted: Wed May 23, 2018 3:54 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1898
Location: Melbourne, Australia

josec wrote:
Thanks for the suggestions. I didn't have any part in the design of this system, so I'm not sure how the company will proceed, but I'll show them this comments so they can evaluate.

We are suggesting industry best practices. Try to change the uninformed design choices while you can.
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Glenn
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