1. Check the network connection: confirm whether the local network is normal and whether the access to the external network is smooth. If necessary, restart the router or contact the network operator.

2. Check the firewall settings: the firewall may prevent the sunflower from connecting. You can try turning off the firewall or adding sunflowers to the firewall whitelist.

3. Check the port settings: Sunflower uses specific ports (593 1 and 5932) for communication to ensure that these ports are open and not occupied by other programs.

4. Check the software version: If you use the old version, there may be connection problems. Try to upgrade or download the latest version of sunflower.