Ok Kendor, here's the reply from Trend Micro:
Dear Sir,
Please try the following:
1. Check for virus and/or spyware infection.
2. Check for conflicts with other software and hardware.
3. Make sure the firewall is configured correctly.
1.
**Checking for virus and/or spyware infection**
Some viruses and spywares prevent the firewall to function properly and may even disable the feature. Make sure the computer is not infected with viruses and spyware by doing the following:
Run HouseCall, Trend Micro's free virus online scan:
http://uk.trendmicro-europe.com/housecall/v6.5/
Run the free online Spyware Scan in the Trend Micro Anti-Spyware for the Web page:
http://www.trendmicro.com/spyware-scan/
2.
**Checking for conflicts with other software and hardware**
A conflict with a software and hardware installed in the computer where PC-cillin Internet Security is installed prevents the firewall from functioning properly.
Check for conflicts with the following:
Other Anti-virus programs
Most antivirus programs cause conflict because they use the same resources used by PC-cillin Internet Security. To avoid software conflict, make sure the computer has only one antivirus program.
Uninstall conflicting antivirus and firewall software.
Third Party Firewall
Running more than one firewall can slow or disable Internet connection because the firewall rules used by each software do not match and are conflicting with each other.
Uninstall conflicting firewall softwares.
Windows XP Firewall (if using Windows XP) The Windows XP firewall should be disabled to prevent issues with PC-cillin Internet Security firewall. To disable, refer to Disabling the Windows XP Firewall in a computer installed with Trend Micro PC-cillin Internet Security:
http://kb.trendmicro.com/solutions/search/main/search/solutionDetail.asp?solutionID=26174
Note: Most routers also have a built-in firewall. Contact the manufacturer of the router for information on how to disable the firewall.
If a firewall other than Trend Micro's firewall is being used, uninstall PC-cillin Internet Security:
http://kb.trendmicro.com/solutions/search/main/search/solutionDetail.asp?solutionID=22087
3.
**Configuring the firewall correctly**
Verify the profile being used.
Internet connection issues may arise if the current profile does not apply to the current Internet settings. To check if the correct profile is being used, refer Unable to connect to the Internet after installing Trend Micro PC-cillin Internet
Security:
http://kb.trendmicro.com/solutions/search/main/search/solutionDetail.asp?solutionID=24578
Make sure Port 80 is selected in the Exception list.
Port 80 is the port commonly used for Internet connection. To make sure the port is selected in the current profile, refer to Including Port 80 in the Exception list of Trend Micro PC-cillin Internet Security:
http://kb.trendmicro.com/solutions/search/main/search/solutionDetail.asp?solutionID=26182
Verify the Security Level
All incoming traffic is blocked when the security is set to High, unless exceptions are made. Medium security is the recommended setting that will resolve the issue.
Best Regards,
Mark
Trend Micro Support
Hope this is of some help to you,
Gcol