I am using Window 10 and was trying to use 4Team Sync2 for my Outlook synchronization between my desktop and laptop. I have talked with their tech support and here's their response:
Frank Freese: I want to continue with Windows firewall. Does Windows firewall present a problem for 4Sync?
Daniel: Sorry, your Windows firewall is somehow messed up. I added Sync2 to trusted software list, and it is still blocking Sync2 to connect 4team ftp..
Frank Freese: how does one unmess Windows firewall?
Daniel: It is question for Windows support.
Frank Freese: OK...I'll see what I can find out. So you've done all you can do, correct?
Daniel: Yes. Sync2 working when firewall is disabled. Something is wrong with it as it does not allow Sync2 to pass the firewall even when Sync2 is on trusted programs list.
How does one repair Windows 10 firewall w/o reinstalling Windows 10?