1. Make sure you are connected to the Internet by ping a web site, for
example, ping chicagotech.net.
2. Check any errors in Event Viewer.
3. Make sure no firewall blocks the MSN Messenger
4. Reset Auto Tuning.
5. Install the latest version of MSN Messenger.
6. Install the latest available updates for your operating system.
7. Make you have latest driver for the NIC and firmware for the router.
Case 1: If I shut down zone alarm, it works.
Case 2: I fixed this problem by disabling the Auto Tuning Networking
feature. This how to may help.
Vista IPCONFIG and Network Settings
How to change the binding order of network providers • How to disable
Auto-tuning on Windows Vista • How to disable TCP/IPv6 ...
www.howtonetworking.com/vista/vistaipconfig.htm
Case 3: My problem is the IPv6 and Auto Tuning were disabled.
Case 4: If you have Zonealarm, you may want to disable ad blocking by going
to control Center>Privacy>Disable ad blocking, and cookie Control.
Case 5: I fixed it by rolling back my Netgear DG834v2 firmware from 3.01.29
to 3.01.25.
Case 6: I found our company proxy server blocks MSN Messenger.
Case 7: Try the following to help resolve the situation:
Click the MSN Messenger icon in the taskbar (next to the clock), and then
click Exit.
Make the following changes to your Internet options:
Click the Microsoft Windows Start button, point to Settings, and then click
Control Panel.
Click Internet Connections.
Click Set up or change your Internet connection.
Click the Content tab.
Under Certificates, click Clear SSL State.
Click OK when you receive a confirmation.
Click the Advanced tab, and then scroll down to Security.
Make sure that Check for server certificate revocation (requires restart) is
not selected, and that Use SSL 2.0 and Use SSL 3.0 are selected.
If your computer is running Microsoft® Microsoft® Windows® XP, clear the DNS
resolver cache.
On the taskbar, click Start, and then click Run.
In the box, type cmd, and then click OK.
At the command prompt, type ipconfig /flushdns, and then press ENTER.
Try to sign-in to MSN Messenger again.
