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Port 1 tcpmux
tcpmux (TCP) 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). This service is almost never used in practice.
CERT: CA-95.15.SGI.lp.vul- RFC1078 -TCPMUX acts much like Sun's $/Exploits/Ports/111$portmapper$ or Microsoft's $/Exploits/Ports/135$end-point mapper$ in that it allows services to run on abitrary ports. In the case of TCPMUX, however, after the "lookup" phase, all further communication continues to run over that port.
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