NNPS / TCP port 433

[Russ Allbery]

Grant Taylor <gtaylor at tnetconsulting.net> writes:

> 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?

433 is generally not encrypted.  The S in NNPS is for "server" not
"security."  433 is the port generally used by servers that want to
separate server-to-server connections on a separate port from
reader-to-server connections (because, among other reasons, spawning the
reader server from the transit server is unnecessary overhead).

> This second statement makes me think that the only difference between
> TCP ports 119 and 433 is their intended purpose.

Correct.

> This seems reminiscent of SMTP's MTA port 25 and MSA port 587, both of
> which are unencrypted / explicit encryption via STARTTLS.

Correct.

-- 
Russ Allbery (eagle at eyrie.org)             <https://www.eyrie.org/~eagle/>

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