Firewall Settings on Primary Machine
Third party firewall
If there is a third-party firewall software or anti virus (eg Avast, AVG, etc.) with own firewall settings running on Primary Machine, then this can prevent spacedesk discovery and connection.
Please ensure that C: \ Windows \ System32 \ spacedeskService.exe is allowed through the firewall software or the spacedesk TCP / IP network protocol port is opened. spacedesk is using TCP port 28252.
Please ensure that the Windows Firewall settings is correct. For details please check chapter Setup Primary Machine – Verify if setup was successful .