Theo Markettos wrote:


3Pay SIM on APN three.co.uk. Has anyone any experience with them blocking
some ports? It appears SMTPS (I think that's port 465) is being blocked -
but I'm trying to diagnose this over the telephone so am not sure what's
going on. Are they trying to force you into using 3Mail?

Do they block other ports? I thought they were fairly lax, but port 24
didn't seem to work either.

Thanks
Theo

A google search for SMTPS turned up the following at
http://de.wikipedia.org/wiki/SMTPS (Google translation from German):

Originally, the Internet Assigned Numbers Authority in early 1997 to port
465 had registered for SMTPS. [1] This was withdrawn in late 1998, specified
as a STARTTLS was. [2] With STARTTLS same port can be used without TLS, and
TLS. [4] [5] For the SMTP was seen as particularly important because clients
respond with this protocol also foreign server from which they can not know
whether it is providing a separate port for TLS. [3] The port 465 is now
Source Specific Multicast for audio and video recorded. [4] [5]

[6] SMTPS will still remain available on port 465, but also on port 587 for
message submission to RFC 4409. [6]

At a guess, its the multicast service they want to block and you might
succeed with port 587 though that would depend on the server you're wanting
to connect to.

Good luck.

--
Steve Hayes, South Wales, UK
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