This happened suddenly just today. I have 3 applications (AVG Antivir, Windows Defender and Spybot S&D) which cannot connect to the internet. Both IE and Firefox can connect OK as can Spywareblaster. I don't know if this is all connected to the same problem or not. I am using Comodo firewall.
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AVG Antivir
Displaying the message: "No connection to the internet could be produced"
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Windows Defender
Comodo displays message "DW20.exe is an invisible application. Could be trojan/spyware/virus activity. MSASCUI.exe might be using DW20.exe to connect to the internet. "
Windows update through ie displays the error message "Error Code: 0x8024402C" and the message:
"The website has encountered a problem and cannot display the page you are trying to view. The options provided below might help you solve the problem" on the next page.
I have tried the troubleshooting tips from the Microsoft site but none of them worked. They were asking to change proxy settings on my firewall which I could not find on Comodo.
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Spybot S&D
OK - just tried this again and it seems to have fixed itself. There was a dialog message about port 10060 (or something). Seems to be fine now.
The problems with the other two apps still exist.
Sorry about the long post but thought I would put them all together as the problems may be related.
Thanks for all help.
Cheers.