NNPS / TCP port 433

[Grant Taylor]

Hi,

Can anyone say with any authority if the NNPS / TCP port 433 is clear 
text like the NNTP / TCP port 119 or implicitly encrypted like the NNTPS 
/ TCP port 563?

IANA has the following three ports registered for NNTP:

NNTP  - 119 - RFC 3977 - unencrypted & explicit encryption via STARTTLS
NNSP  - 433 - RFC 3977 - unspecified
NNTPS - 563 - RFC 4642 - implicit encryption via TLS

RFC 3977 has "STARTTLS" but discusses it on TCP port 119.

RFC 3977 also states:    The official TCP port for the NNTP service is 
119.  However, if a host wishes to offer separate servers for transit 
and reading clients, port 433 SHOULD be used for the transit server and 
119 for the reading server.

This second statement makes me think that the only difference between 
TCP ports 119 and 433 is their intended purpose.  This seems reminiscent 
of SMTP's MTA port 25 and MSA port 587, both of which are unencrypted / 
explicit encryption via STARTTLS.

So ... what should the NNSP / TCP port 433 be?  My inclination is that 
NNSP / TCP port 433 is identical to NNTP / TCP port 119.

What say you?



-- 
Grant. . . .
unix || die

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