- Open the Windows Firewall dashboard (e.g. by entering wf.msc on the command-line)
- Click Inbound Rules (left panel)
- Click New Rule... (right panel)
- Select Program as the type of rule and click Next
- Enter the path of CompleteFTPService.exe (see * below) and click Next
- Select Allow the connection and click Next
- Check Domain, Private and Public and click Next
- Enter the name of the rule (e.g. CompleteFTP inbound) and click Finish
It is worth noting that if CompleteFTP is in a DMZ, you may need to open firewall ports to allow it to access domain controllers to add users. Typically the LDAP ports will need to be opened: TCP and/or UDP 389.
* CompleteFTPService.exe is in C:\Program Files (x86)\Complete FTP\Server on 64-bit systems and in C:\Program Files\Complete FTP\Server on 32-bit systems.