![]() ![]() RFC1078 - TCPMUX acts much like Sun's portmapper, or Microsoft's end-point mapper in that it allows services to run on arbitrary ports. This service is almost never used in practice. Scans against this port are commonly used to test if a machine runs SGI Irix (as SGI is the only system that typically has this enabled). Backdoor.Sockets23, Lame, Backdoor.Kamikaze, IRC_trojan, TROJ_Backdoor, W32/Cheval.gen, coded in Delphi 3, 06.1998). Sockets des Troie remote access trojan uses this port (a.k.a. TCP Port Service Multiplexer (IANA registered) Port 0 can be used by applications when calling the bind() command to request the next available dynamically allocated source port number. Some ISPs may block it because of exploits. It is sometimes used to fingerprint machines, because different operating systems respond to this port in different ways. Port 0 is reserved by IANA, it is technically invalid to use, but possible.
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