Greetings,

The reason you're seeing this is because you have the Windows Firewall engaged. If you click
Start, then All Programs, then Accessories, then Communications then Network Connections,
right-click your primary connection, choose Properties, then Advanced and depending on what
version of XP you're using, either click Settings for the Firewall and disable it or just
uncheck the firewall option.
____________________________________________
Jonathan Kay
Microsoft MVP - Windows Messenger/MSN Messenger
Associate Expert
http://www.microsoft.com/windowsxp/expertzone/
Messenger Resources - http://messenger.jonathankay.com
All posts unless otherwise specified are (c) 2006 Jonathan Kay.
You *must* contact me for redistribution rights.

"Luiscat" <Luiscat@discussions.microsoft.com> wrote in message
news:06D33483-E3CF-41BF-BCA0-A1285F1E9EED@microsoft.com...
> Windows messenger 5.1.0701
>
> I am using only in local network with Exchange 2000.
> I can't send messages to 2 or 3 contacts, they didn't block me and the
> problem is only from my computer. If i logon another computer it works fine.
> Any ideas?
>