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Network Working Group                                     Alex McKenzieRequest for Comments: 593                                           BBN                                                             Jon Postel                                                                  MITRE             Telnet and FTP Implementation Schedule ChangeTelnet and FTP Implementation Schedule Change   We have been contacted by several Telnet implementers and concerned   users regarding the scheduled changeover from old to new Telnet.   There is a good deal of concern about accomplishing a coordinated   changeover especially in light of the potential incompatibilities   (RFC 559, NIC18482).  Therefore the changeover is reformulated as   follows.   New Telnet implementations are to be ready 1 Jan 74 (as before), but   are to use ICP socket 23 (decimal).  That is the server Telnet will   listen on socket 23, and user Telnet programs will connect to socket   23.  It will also be useful for the user program to let the user   optionally select the server socket, as many user Telnet programs   currently do.  It will also be useful for implementers to consider a   server Telnet program capable of dealing with both protocols as MIT-   DMCG has done (RFC 559).  This will provide an opportunity for   testing and debugging the new programs in a way that does not   interfere with normal use.   During January we will survey the technical liaisons to determine the   status of the Telnet implementations.  As soon as we determine that   the Telnet implementations have reached a point where the changeover   can be made without disruption of user services the technical   liaisons will be notified.   In light of this change in the Telnet implementation schedule, the   FTP schedule is also modified.  New FTP implementations are to be   ready by 1 Feb 74 (as before), but will continue to use ICP socket 21   (decimal) until we can determine that a changeover is appropriate.References   Telnet Protocol NIC 18639   File Transfer Protocol NIC 17759         [This RFC was put into machine readable form for entry ]         [into the online RFC archives by Mirsad Todorovac 5/98 ]McKenzie & Postel                                               [Page 1]