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+Network Working Group                                     Alex McKenzie
+Request for Comments: 593                                           BBN
+                                                             Jon Postel
+                                                                  MITRE
+
+
+             Telnet and FTP Implementation Schedule Change
+
+Telnet 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]
+