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Guaranteed communication/delivery is the key difference between TCP and UDP. TCP guarantees delivery of dataĪnd that packets will be delivered in the same order in which they were sent. To establish a connection and exchange streams of data. TCP ports use the Transmission Control Protocol, the most commonly used protocol

Used port numbers for well-known internet services.

IANA is responsible for internet protocol resources, including the registration of commonly Ports are unsigned 16-bit integers (0-65535) that identifyĪ specific process, or network service. Port numbers in computer networking represent communication endpoints. Ports 27000 to 27050 are typically used by some online games. Half-Life and its mods, such as Counter-Strike (unofficial)ĭark Messiah of Might and Magic Steam Client By sending a specially-crafted datagram to UDP port 27015, a remote attacker could exploit this vulnerability to cause the server to crash. The SV_CheckForDuplicateNames function in Valve Software Half-Life CSTRIKE Dedicated Server 1.1.1.0 and earlier allows remote authenticated users to cause a denial of service (infinite loop and daemon hang) via a certain connection string to UDP port 27015 that represents "absence of player informations," a related issue to CVE-2006-0734.Ĭall of Duty: Modern Warfare is vulnerable to a denial of service, caused by an error in the online multiplayer functionality. The SV_CheckForDuplicateNames function in Valve Software Half-Life CSTRIKE Dedicated Server 1.6 and earlier allows remote authenticated users to cause a denial of service (infinite loop and daemon hang) via a backslash character at the end of a connection string to UDP port 27015. Ports 27000 to 27040 are typically used by some online games. Half-Life and its mods, such as Counter-StrikeĮmpire: Total War (The Creative Assembly)

Steam (Valve gaming platform) uses these ports:Ģ7000-27015 udp (Steam client game client traffic)Ģ7015-27030 tcp/udp (typically matchmaking and HLTV, also used to download Steam content)Ģ7031 udp, 27036 tcp/udp, and 27037 tcp (incoming for in-home streaming)ģ478 udp, 4379 udp, 4380 udp (outbound - Steamworks P2P networking and voice chat) Ports 27000 to 27040 are typically used by online games. GoldSrc and Source engine dedicated server port