The computer still answers incoming requests for authorized apps.
You should try to contact its developers, and ask them for a solution, or try another Fire Wall.
The system services that are still allowed to receive incoming connections are: Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them.
Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled.
This makes it easier to gain the benefits of firewall protection, and helps prevent undesirable apps from taking control of network ports open for legitimate apps.
Selecting the option to "Block all incoming connections" prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections.
The steps for configuring the firewall above are meant for a corporate firewall positioned between WSUS and the Internet.