[cc'd to ph-linux-newbie, this may interest them]
On Thursday 06 September 2001 17:58, Rowel Atienza wrote:
> > Now "telnet" works, but "telnet hostname 25" does not
> > so "sendmail" fails to deliver mail. How does one get
> > sendmail to work? Help!
>
> is there a listening telnet socket at port 25? i think this is used
> by smtp and you can not telnet to it ( or can you? ). telnet uses port
> 23.
hi there rowel,
you can actually use a telnet client to initiate tcp connections to ports
other than 23. this is useful for checking if tcp services are listening on
the specified port.
e.g.
to check for smtp
telnet hostname 25
to check for pop3
telnet hostname 110
to check for http
telnet hostname 80
etc. etc.
if you know the standard 'conversations' of the protocol you're checking, you
can do stuff like send/retrieve email, browse web pages, etc. all with a
telnet client.
neat huh?
-eric
--
�.--. �Enrique D. Rosel II � � � � � � � � � � office://+63.2.894.3592/
( () ) Q Linux Solutions, Inc.
�`--\\ A Philippine Open Source Solutions Co. �http://www.q-linux.com/
_
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