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| Unexplained Loss of Connection |
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| mandrews |
 Posted: Thu Apr 01, 2004 11:00 am Post subject: Unexplained Loss of Connection |
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Newbie
Joined: 01 Apr 2004
Posts: 3
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Our customer, running JMS on a single multi-homed server, is connecting over a VPN to two different W2K servers running MQ 5.3. Intermittently (every couple of days), the customer application will suddenly not be able to connect to one or the other of the MQ servers, but within 5 to 30 minutes, the issue resolves itself as mysteriously as it began. The error message is along the lines of:
"RemoteException: clientname.acc.servername.MQJMSException: No response
for message ID:xxxxxxxxxxx for client 15.06 was received in 20000 milliseconds...."
When we look at the MQ servers, the channels to the mainframe are up and there are no error messages. The firewall on the MQ server side only shows the time that the last session was established through the VPN and not the detail about specific packet activity, so we can't verify whether data is leaving the client-side network and getting to the MQ Server. The firewall does show that the VPN is (and has been ) up, and there are no dropped packets. No networking or other monitors have indicated a problem.
The VPN settings have been verified on both sides, and the customer has been asked to check the MTU size to see that it is set to 1324 (so the additional firewall encapsulation will keep it under 1500).
Any ideas how or why this intermittent issue would occur? Thanks in advance for the help! |
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| mandrews |
| Posted: Mon Apr 12, 2004 4:22 am Post subject: Last call - does anyone have any ideas? Thanks! |
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Joined: 01 Apr 2004
Posts: 3
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| jefflowrey |
| Posted: Mon Apr 12, 2004 4:32 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Are you catching a linked exception to the MQJMSException?
Are you seeing an MQSeries errors on the mainframe queue manager?
_________________
I am *not* the model of the modern major general. |
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| mandrews |
| Posted: Tue Apr 13, 2004 1:08 pm Post subject: Error Messages and Dump Data |
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Newbie
Joined: 01 Apr 2004
Posts: 3
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Thanks for the reply, Jeff, and my apologies for the late reply - I didn't receive the notification of your posting.
Anyway, the customer is reporting MQJMS2008, and MQJMS2005 MQException: Completion Code 2, Reason 2059.
On our side, there are no errors on the channel to the mainframe - in fact, other packets are getting through this channel and being returned to the MQ server and ultimately through the VPN to a different box at the customer side.
ALL indications (from our point of view), are that the root cause is in the customer's network - specifically, somewhere in their application. The intermittent nature is inconsistent with anything that we have visibility to.
Another new point - a recent TCP dump taken on the customer side during the issue, yielded a responding MAC address that did not correspond to any on our side of the WAN (server, firewall, and ARP tables). Further indication to us that, during the issue, their traffic is not reaching our network.
Please let me know if this gives you any other ideas, and thanks again! |
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| gunter |
| Posted: Tue Apr 13, 2004 2:36 pm Post subject: |
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Partisan
Joined: 21 Jan 2004
Posts: 307
Location: Germany, Frankfurt
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If you hava a problem with client-connections, the log is the MQSeries log, not the queuemanager-log, maybe you looked in the wrong directory.
On a channel between two queuemanager, you can configure the retry counts and interval to handle connection-problems like spanning tree. For a client-connection you have to handle this in the application. In a LAN, is it not really nessessary because the network is stable, but if you have a connection in the WAN, interrupts are possible. Maybe you can avoid this errors by changing the tcp/ip settings, but I'm not familiar with VPN and it's configuration.
_________________
Gunter Jeschawitz
IBM Certified System Administrator - Websphere MQ, 5.3 |
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