Problem:

When launching Trend Micro Worry Free Business Web Console/Dashboard you get a blank page in Internet Explorer (or other browser), that is, you cannot access the webconsole.

Solution:

The solution to this problem is to uninstall and re-install the Virtual Website. To do this, follow these steps on the server where Trend is installed:

1. On the Security Server, open the IIS Manager (found in Administrative Tools) and find "OfficeScan" listed under "websites", then close IIS Manager.
2. Open a command prompt and then change directory to ..\Trend Micro\Security Server\PCCSRV.
3. Type the following command and press Enter:
4. svrsvcsetup.exe -uninstall
5. Open the IIS Manager and check that "OfficeScan" is no longer listed under "websites"
6. Type the following command and press Enter after each entry/line:
   1. svrsvcsetup.exe -install
   2. svrsvcsetup.exe -setvirdir
   3. svrsvcsetup.exe -setprivilege
   4. svrsvcsetup.exe -enablessl
7. Restart the following services:
   1. Trend Micro Security Server Master Service
   2. IIS Admin Service
   3. World Wide Web Publishing service.
8. You may want to open Internet Explorer and clear the history, cookies and cashes/temporary internet files.

Now try to access the webconsole/dashboard again. The problem should be solved.

Trend's Solution:

If the above steps do not work for you, you can try the more detailed steps below (I tried these first, as recommended by Trend, when they made no difference I tried the steps above, which worked):

1. On the Security Server, open the IIS Manager.
2. Delete the OfficeScan virtual website and then close the IIS Manager.
3. Open a command prompt and then change directory to ..\Program Files\Trend Micro\Security Server\PCCSRV.
4. Type each command and press Enter:
   1. svrsvcsetup.exe -setvirdir
   2. svrsvcsetup.exe -setprivilege
      svrsvcsetup.exe -enablessl (if using SSL)
5. Close the command prompt and then open the IIS Manager.
6. Right-click Application Pools and then click New > Application Pool.
7. Use default settings for the new Application Pool.
8. Right-click the new Application Pool and click Properties.
9. Click the Identity tab and select "Predefined" > "Local System".
10. Check if the OfficeScan virtual website was recreated.
11. Right-click OfficeScan and then click Properties.
12. Click the ISAPI Filters tab and click on Add.
13. Type "ReverseProxy" in the Filter Name field.
14. Click Browse and find ..\Security
15. erver\PCCSRV\Web_console\CGI\ReverseProxy.dll.
16. Click the Home Directory tab and select the newly created Application Pool.
17. Click OK when the Inheritance Overrides prompt shows up.
18. Set the Execute permissions to "Scripts and Executables".
19. Tick the "Read" and "Write" boxes.
20. Click the Directory Security tab and click on "Edit" under "Authentication and access control".
21. Enable anonymous access and use an Administrator account (instead of the IUSR account) and the corresponding password.
22. click on "Edit" under "IP address and domain name restrictions".
23. Choose to grant access to all computers.
24. Stop and restart the OfficeScan virtual web site.
25. Close the IIS Manager.
26. Make sure 'Everyone' has full permissions on the \PCCSRV folder (on the Security Server).
27. Make sure 'IIS_IUSRS(Server_Name\IIS_IUSRS)' has full permissions on the \PCCSRV\TEMP folder (on the Security Server).
28. Delete all temporary files, cookies, history and offline content from the Internet Explorer options.
29. Restart the Trend Micro Security Server Master Service, the IIS Admin Service and the World Wide Web Publishing service.
30. Try to access the webconsole again. 

Additional Notes:

Trend Continued to work properly (detecting and logging viruses and even allowing us to update the licence) while we were experiencing this problem.

I am running IIS on a Windows Storage Server Operating System (SP2) on this machine.