Security practitioners for decades have advised people to limit DNS queries against their DNS servers to only use UDP port 53. The reality is that DNS queries can also use TCP port 53 if UDP port 53 ...
Our Cisco 2921 is blocking an specific UDP port outbound. The 2921 has the firewall enabled. So far I'm stumped - I've added an ACL to allow the traffic, created a user defined service and added that ...
Pretty normal setup here, 3 interfaces, inside, outside, and voip, the voip interface only needs access from (inside) for management, I am seeing tons of these errors in ...
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