[@Ivan] Hello, sorry Windows XP is supported as a legacy compatibility version, so please make sure your system has all updates/upgrades and is not running any 3rd-party (non-Microsoft) software that may interact with the Winows Firewall. In any case that error won’t prevent you from using our software, you will simply have to open the ports (20-21-22-989-990-4443) on your Windows Firewall manually. Thank you for your patience.