When you encounter "unable to receive or send files," Check the firewall settings for WINXP/WIN7/WIN8, and you can find the "start" → "Control Panel" → "System and Security" → "Windows Firewall feature" → "Allow programs or features through Windows Firewall". ZAPYAWPF "(Win7/win8 users log on as a non-administrator, please click" Change Settings ", Win8 users can use win +x start Control Panel, follow up and WIN7 consistent). All three boxes are checked, click OK and try to reopen the "fast tooth computer version".
(Reason: WinDOS Firewall protects system communication security, all communication applications are protected)
Example diagram for Win7 system
Open Control Panel in the start interface
Click "Windows Firewall" in the Control Panel to enter
Click "Allow program or function through firewall"
Find the Zapyawps item and play "√" inside three frames