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DNS inspection caused the problem
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When my DNS server is behind an ASA it sometimes times out on &nbsp;(Client queries to DNS) &nbsp;clients but when DNS server is not behind firewall it works fine. Port 53 tcp and udp are open to DNS server.<br />
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Any idea what issue can be.
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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.

DNS times out

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.