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> error in Sendmail or HylaFAX or a bug? Is it absolutely necessary that > the data socket always is on port 4558 rather than an arbitrary free In following this up, I noted that 4557, 4558 and 4559 are marked unallocated in the IANA assigned numbers list. Is anyone familiar with the procedures for registering port numbers, as this really ought to be done. 444 is assigned to SNPP.