Common ports, such as TCP port 80 (HTTP), may be locked down - but other ports may get overlooked and be vulnerable to hackers. The easiest way to fix this vulnerability is to restrict the access on this port to the local DNS server IP addresses. ![]() Consequently, it has a rule to allow incoming DNS traffic (UDP) through source port 53. Remediating UDP Source Port Pass Firewall Vulnerability on ESXi servers ESXi uses a stateless firewall.
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