Re: Ports used on ICC
- From: David Richerby <davidr@xxxxxxxxxxxxxxxxxxxxxx>
- Date: 24 Jul 2006 10:19:29 +0100 (BST)
Dave (from the UK) <jun-2006@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Gil Baron wrote:
Dave (from the UK) wrote:
Obviously in this case I am forcing the use of port 5000.
Doesn't ICC actually useTelnet?
Yes, but not at the standard port for telnet, which is 23.
And with good reason. Telnet is typically used as a remote login
service (in a sense, this is what ICC is providing) but many networks
block access to this port. This is because telnet is insecure for
remote login, since it sends passwords around unencrypted. A sensible
network will only block *incoming* connections to port 23 but fire-
walls are often run by monkeys and many networks block outgoing port
23, as well.
(Actually, blocking outgoing telnet isn't so stupid: many users have
the same username and password on different systems so knowing that
you're user `fred25' with password `crackme' on the system you're
telnetting to gives me a good guess at what your username and password
might be on the system you came from.)
Dave.
--
David Richerby Disgusting Gnome (TM): it's like a
www.chiark.greenend.org.uk/~davidr/ smiling garden ornament but it'll turn
your stomach!
.
- References:
- Ports used on ICC
- From: Dave (from the UK)
- Re: Ports used on ICC
- From: Gil Baron
- Re: Ports used on ICC
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