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CentOS Linux Avahi Error: avahi-daemon[2699]: Invalid query packet

While troubleshooting another problem this evening I noticed a bunch of avahi-daemon errors in the messages log on a CentOS Linux development server. The error hasn’t caused any issues that I am aware of and may be a simple case of a new warning message or another server on the network sending rogue DNS packets to the CentOS server in question. Below is information displaying the error in the messages log and what steps I took to resolve the problem.

Avahi Error: avahi-daemon[2699]: Invalid query packet

Sep 13 10:10:27 cent2 avahi-daemon[2699]: Invalid query packet.
Sep 13 10:17:16 cent2 last message repeated 3 times
Sep 13 10:23:26 cent2 last message repeated 3 times
Sep 13 10:32:11 cent2 last message repeated 3 times
Sep 13 10:51:48 cent2 last message repeated 3 times
Sep 13 11:05:47 cent2 last message repeated 3 times
Sep 13 12:19:03 cent2 last message repeated 3 times
Sep 13 12:44:43 cent2 last message repeated 3 times
Sep 13 12:49:06 cent2 last message repeated 3 times
Sep 13 13:14:30 cent2 last message repeated 3 times
Sep 13 14:03:40 cent2 last message repeated 3 times
Sep 13 15:27:44 cent2 last message repeated 3 times
Sep 13 15:37:50 cent2 last message repeated 2 times
Sep 13 16:38:30 cent2 last message repeated 3 times
Sep 13 17:22:27 cent2 last message repeated 3 times
Sep 13 17:32:18 cent2 last message repeated 3 times
Sep 13 17:54:15 cent2 last message repeated 3 times
Sep 13 18:01:22 cent2 last message repeated 3 times
Sep 13 19:29:30 cent2 last message repeated 9 times

The avahi-daemon is the Avahi mDNS/DNS-SD daemon that runs on Linux so it is likely the above error messages are normal and simply come from servers sending the incorrect type of packets to the server. I went ahead and upgraded the avahi-daemon through from avahi version 0.6.16-6.el5.i386 to avahi version avahi-0.6.16-9.el5_5.i386 which appears to have stopped the errors. It is also possible though that there have not been any packets sent to the server that cause this specific error. You can update the avahi-daemon on CentOS Linux with the Yum Package Manager using the below syntax.

Update avahi-daemon On CentOS Linux:

yum update avahi

If I continue to see invalid query packet errors in the messages log I will investigate more.


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