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Live Messenger Cannot Sign-in … 80072745 Error in Live Messenger – Solved!

Windows Live Messenger Screen Shot

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The 80072745 Error


I’ve been getting the 80072745 error in Windows Live Messenger the last 4 days. I contacted Microsoft but there was no answer from their side. I searched a lot but no solution on the net seemed to work with the error I was getting.


I’ve installed Live messenger 8.0, Live Messenger 8.5 and also the beta version (9.0) but every time, the same error pop up. I tried to remove the messenger and reinstall it but no luck! I removed even the registry keys messenger uses and installed it again, but nothing changed. The troubleshooting wizard reported that everything was fine and the connection was OK!


I installed Windows Messenger 5.1 for XP and tried to login, and that WORKED!! so I found out that there’s no problem with my account, my IP or microsoft services’ servers!


After some tests, I found out that the problem is that I can’t send data to the messenger servers. I had OUTPOST FIREWALL PRO 2008 installed on my computer. I configured the firewall to trust Live Messenger and allow TCP and UDP communications for the messenger, but the problem was still there. I uninstalled Outpost Firewall and restarted the computer, but still no luck!