Issue with DNS on dmz onm ASA 5510

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Sep 30th, 2010
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I have an issue with an server that is connected to a DMZ on a ASA 5510

There are errors on the log that says deny inbound udp from "object" to "dns server" due to dns query

The rule base has port 53 open and is configured as part of a service group that also has other ports open as well but still issues

I have attched config and any help would be appreciated


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Jennifer Halim Thu, 09/30/2010 - 03:03
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The rule that you have is TCP/53, DNS resolution is on UDP/53. Please allow UDP/53 accordingly.

Hope that helps.

game123 Thu, 02/16/2012 - 00:25
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Dns service needs top and udp 53 both ...

Udp 53 for name resolutions and Tcp 53 for zone transfers !!!


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