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| gs |
 Posted: Wed Apr 09, 2008 5:20 am Post subject: amqrmppa process spamming DNS server |
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Master
Joined: 31 May 2007
Posts: 254
Location: Sweden
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Hi,
I got a call from the network team who said that a server was spamming the DNS server with about 500+ DNS lookups per second.
The requests was for an ip that belongs to my client computer which doesn't have a reverse dns entry.
The server in question is a SuSE linux server running MQ 6.0.1.1 to which I connect using broker toolkit, mqmon & rfhutil on a SSL'ed client channel (selfsigned exchanged certificates).
A netstat check on the server indicates that my client has 5 established MQ related connections and 77 CLOSE_WAIT (yes, we should enable keepalive).
However, a netstat check on my client reveals no MQ related connections to the server.
Nothing in any MQ logs related to this, what could cause this behaviour? |
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| Gaya3 |
| Posted: Wed Apr 09, 2008 5:29 am Post subject: |
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Jedi
Joined: 12 Sep 2006
Posts: 2493
Location: Boston, US
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you answered the solution in your previous post...
TCPKeepAlive, if its a Server/Client
Regards
Gayathri 
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Regards
Gayathri
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Do Something Before you Die |
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| gs |
| Posted: Wed Apr 09, 2008 5:31 am Post subject: |
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Master
Joined: 31 May 2007
Posts: 254
Location: Sweden
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| Thanks, the question wasn't about the CLOSE_WAIT connection but why the DNS spamming occurs. |
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| jefflowrey |
| Posted: Wed Apr 09, 2008 5:32 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Also, you should upgrade to 6.0.2.3... 6.0.1.1 is troublesome on a lot of fronts.
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I am *not* the model of the modern major general. |
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| gs |
| Posted: Wed Apr 09, 2008 5:54 am Post subject: |
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Master
Joined: 31 May 2007
Posts: 254
Location: Sweden
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| jefflowrey |
| Posted: Wed Apr 09, 2008 5:58 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I didn't expect a bug that specific to your situation... Well, 
And now you have a driver to apply the update...
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I am *not* the model of the modern major general. |
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