DNS times out

ciscosupp
ciscosupp used Ask the Experts™
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When my DNS server is behind an ASA it sometimes times out on  (Client queries to DNS)  clients but when DNS server is not behind firewall it works fine. Port 53 tcp and udp are open to DNS server.

Any idea what issue can be.
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Commented:
The only conclusion here is still that you have to look at the rules in the ASA, DNS traffic is still being blocked.

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Commented:
DNS inspection caused the problem

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