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| MQRC 2009 in Linux 7.5.0.2 |
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| vsathyan |
 Posted: Thu Mar 05, 2015 5:27 am Post subject: MQRC 2009 in Linux 7.5.0.2 |
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Centurion
Joined: 10 Mar 2014
Posts: 121
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Lately, we are facing a lot of mqrc 2009 issues (once in 2 seconds) when a windows app connects to a queue manager in Linux, 7.5.0.2 after a couple of hours after the app is started.
However, the same code/app when configured to connect to a windows queue manager, on v 7.0.1.8 works fine. Though we get one or two mqrc 2009 errors, it is not occurring as frequently when it connects to the Linux queue manager.
Network packets were captured, and the network team says there are no packet drops.
The disconnect interval for the server connection channel in Linux queue manager is set to 0, so that the channel continues to run when there are no messages flowing. (This is done to test whether its a problem with network).
qm.ini stanza is as below
TCP:
KeepAlive=Yes
ListenerBacklog=100
CHANNELS:
MaxChannels=8192
MaxActiveChannels=8192
AdoptNewMCA=ALL
AdoptNewMCATimeout=60
AdoptNewMCACheck=ALL
Any inputs why this issue may be occurring? Thanks in advance. |
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| Vitor |
| Posted: Thu Mar 05, 2015 5:51 am Post subject: Re: MQRC 2009 in Linux 7.5.0.2 |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| vsathyan wrote: |
| Network packets were captured, and the network team says there are no packet drops. |
What do they say about packets deliberately sent back because something in the network times the port connection out after 120 minutes?
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| PaulClarke |
| Posted: Thu Mar 05, 2015 6:52 am Post subject: |
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Grand Master
Joined: 17 Nov 2005
Posts: 1002
Location: New Zealand
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If it is happening consistently after being connected for a couple of hours (or perhaps 2 hours after the last data has been sent) then I'd be looking at all my firewall rules.
Cheers,
Paul.
_________________
Paul Clarke
MQGem Software
www.mqgem.com |
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| tczielke |
| Posted: Thu Mar 05, 2015 11:03 am Post subject: |
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Guardian
Joined: 08 Jul 2010
Posts: 941
Location: Illinois, USA
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If your Windows application uses long running connections, it might help your investigation to determine the network endpoints (i.e. ip address:port) that the Windows client app and the MQ queue manager on Linux are using. There are ways to do this on the Linux queue manager using the undocumented amqrdbgm program and lsof. I have commented more in detail how to do that with this thread -> http://www.mqseries.net/phpBB2/viewtopic.php?p=386727&sid=e6ebe5da3da4861520c46b62c0825ab6
Once you know your network endpoints for your MQ connection, you could ask your Windows and Linux admins to run TCP traces to see if the packets are making it from the Windows to the Linux server when your app gets the 2009. It would at least give your Network people something more specific to investigate.
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Working with MQ since 2010. |
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