this might be some help.
16. If you are still encountering an issue and if you are running a firewall, temporarily disable Internet Security (including all firewall applications and anti-virus applications) and then restart messenger and sign in and verify again. If this works and if the computer is running third-party (non-Microsoft) software or firewall software, such as ZoneAlarm, Norton Internet Security or McAfee, make sure that the software is set to let MSN Messenger operate, and then try to sign in to MSN Messenger again. Visit the following Web site for information about the most common firewalls:
http://messenger.msn.com/help/issues.aspxThese firewall software are installed in your computer and you need to check if they allow MSN Messenger full access:
Windows Firewall
a. Click Start, click Run, type FIREWALL.CPL, and then press ENTER.
b. On the General tab, if the On check box is selected, the Windows Firewall is enabled. Go to step c.
c. Click the Exceptions tab.
d. Under Programs and Services, select MSN Messenger if it appears in the list, and then click Delete.
e. Click Add Program, click Browse, and then locate the C:\Program Files\MSN Messenger folder.
f. Double-click the Msnmsgr file.
Note: The computer settings determine whether the file name is followed by the extension ".exe."
g. Make sure that the Msnmsgr file is added to the Programs and Services list and that MSN Messenger is selected.
h. Click OK to save the changes.
Norton Internet Security 2003 or later and Norton Personal Firewall 2003 or later
a. Start the Norton Internet Security or Norton Personal Firewall program.
b. Click Personal Firewall, and then click Configure.
c. Click the Programs tab.
d. Remove all the instances of Msnmsgr.exe from the Manual Program Control List.
e. To add MSN Messenger to the list, click Add.
f. Click Browse, locate the C:\Program Files\MSN Messenger folder, and then double-click the Msnmsgr file.
Note: The computer settings determine whether the file name is followed by the extension ".exe."
g. Make sure that the file is added to the Manual Program Control List.
h. In the Internet Access column, make sure that MSN Messenger is set to Permit All.
i. For more information, visit
http://www.symantec.com/techsupp/consumer.html, select the version of the product that you are using, and then search for "Changing Internet Access Control settings" or "Changing firewall rule settings" in the product manuals.
For all other versions of Norton, visit
http://www.symantec.com/techsupp/nis/discontinued.html, and then look for "Changing Internet Access Control settings" or "Changing firewall rule settings " in the product manuals.
I hope these steps resolve your concern with MSN Messenger. If you need further assistance, you may contact us at
http://support.msn.com. For additional information and self-help instructions, visit
http://messenger.msn.com/Help/.
HTH