Verify:
Please verify that all necessary Net Control 2 modules were successfully registered in Microsoft Firewall:
for Windows XP, click Start -> Control Panel -> Windows Firewall. In Windows Firewall window, click "Exceptions" tab;
for Windows Vista, click Start -> Control Panel -> Security -> Windows Firewall.

The list of exceptions should include the following modules:

Name of module as specified in Windows Firewall	Default path to the module
NetControl2 Chat	C:\Program Files\Net Control 2\netchat.exe
NetControl2 Client	C:\Program Files\Net Control 2\netctl.exe
NetControl2 Server	C:\Program Files\Net Control 2\ncserver.exe
NetControl2 RD Server	C:\Program Files\Net Control 2\ncvserver.exe
NetControl2 RD Viewer	C:\Program Files\Net Control 2\ncview.exe

When modules were not added to the list of exceptions automatically, you should add them to the list manually, as specified above.