OpenVPN Port: use 1194 UDP or 443 TCP? | Netgate Forum

DNS port 53 (udp) is for a client to query a server. This is the standard method of pulling down a single query from a DNS server and is by far the most commonly used form of DNS . DNS port 53 (tcp) is used for server-to-server communications (typ) when one server is requesting a zone transfer of the entire zone. Check UDP connection to any port of any IP or website from different places. For example you could check a DNS or game server for availability from many countries. Examples: 8.8.8.8:53. domain://8.8.4.4. cw.live-cs.ru:27997 Port(s) Protocol Service Details Source; 135 : tcp,udp: loc-srv: Remote Procedure Call (RPC) port 135 is used in client/server applications (might be on a single machine) such as Exchange clients, the recently exploited messenger service, as well as other Windows NT/2K/XP software. UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message

Jun 23, 2013 · OpenVPN can run over either the TCP (Transmission Control Protocol) or UDP (User Datagram Protocol) transports. Choosing which one to use is a highly technical issue, and one that most VPN providers (quite understandably) keep hidden ‘behind the scenes’.

OpenVPN Port: use 1194 UDP or 443 TCP? | Netgate Forum

Which TCP and UDP Port used by uTorrent? - General

The computer enters the Port addresses into the UDP or TCP message. Then the UDP or TCP message is put inside of an IP packet, which is in turn addressed by the computer using IP addresses. Since applications always listen to a specific Port but also a specific Transport Protocol (UDP or TCP), then you always have to know not just which port