MSN Messenger uses
UPnP now
uPnP is about 'firewall
discovery', gateway awareness
at the O/S level, and
automatic opening for
traffic for applications.
MSN Messenger uses UPnP
so if your router does
not support it you can
just forget about sending
any files / audio / video
with MSN Messenger.
Previous MSN connection
problems are resolved
by UPnP-aware applications
and routers.
So just use a uPnP enabled
router. (Make sure your
router is uPnP enabled
some routers that are
uPNP compatable still
require this to be enabled
by the user)
Currently Microsoft offer
uPnP on Windows XP only.
It does not work with
Windows 2000.
Port forwarding (The
old way)
If your broadband router
does not support uPnP,
try to do port forwarding.
However, fixed port
does not work well because
it will limit you to only
one client PC behind the
router. UPnP is still
the preferred method.
Enable NAT port forwarding
on these incoming TCP
ports 6901 & 6891-6900.
To enable voice communications,
make sure that outgoing
TCP connections from port
6901 are enabled. Also
enable UDP packets where
either the source or the
destination port is 6901.
To enable file transfers,
enable both incoming and
outgoing TCP connections
to the 6891-6900
range of TCP ports. This
allows each sender to
perform up to 10 simultaneous
file transfers. Note that
if only TCP port 6891
is open, users are only
able to perform one file
transfer at a time.
To enable messaging,
enable outgoing TCP connections
to TCP port 1863.
Last Updated:
December 30, 2004
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