Udp port 53

domain name system - how to open port 53 for bind - Server

Remediating UDP Source Port Pass Firewall Vulnerability on Remediating UDP Source Port Pass Firewall Vulnerability on ESXi servers ESXi uses a stateless firewall. Consequently, it has a rule to allow incoming DNS traffic (UDP) through source port 53. The easiest way to fix this vulnerability is to restrict the access on this port to the local DNS server IP addresses. How to Find Open and Blocked TCP/UDP Ports Oct 21, 2019 Windows XP/Server 2003 may be listening on UDP Port 53

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Mar 26, 2013 TCP 53 - Port Protocol Information and Warning! Guaranteed communication over port 53 is the key difference between TCP and UDP. UDP port 53 would not have guaranteed communication in the same way as TCP. Because protocol TCP port 53 was flagged as a virus (colored red) does not mean that a virus is using port 53, but that a Trojan or Virus has used this port in the past to communicate. TCP domain name system - how to open port 53 for bind - Server

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security - How to verify that a UDP port is open UDP is obviously a send-and-forget protocol. For example, during an NMap UDP scan, the only way to definitively prove that a UDP port is open is if you receive a response from that port. Keep in mind that many services may not reply to arbitrary data and require protocol or application-specific requests in order to warrant a response. Technical Note: Traffic Types and TCP/UDP Ports used by Port(s) FortiManager v3.0: FortiGuard Web Filtering and Antispam rating replies: Source: UDP 53 (default) or UDP 8888 Destination: UDP 1027 or UDP 1031: FortiOS v3.0: FortiGuard Web Filtering and Antispam rating lookup This can be to the FDN or to a FortiManager acting as a private FDS. Source: UDP 1027 or 1031 Destination: UDP 53 (default) or TCPやUDPにおけるポート番号の一覧 - Wikipedia