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Active and Passive Application are running on different PCs
1. Check the IP information. (Set Passive IP to Passive and Active IP.)
2. Check if the Port information matches.
3. Check the Connection mode. (Passive mode, Active mode)


If Active and Passive Application are running on the same PC
1. Check the IP information. (You can set the local PCs IP or set it to 127.0.0.1.)
2. Check if the Port information matches.
3. Check the Connection mode. (Passive mode, Active mode)


Cautions
If you repeatedly connect and disconnect, this is a firewall issue.
Please check your firewall.
Firewall
You should check both the vaccine program (V3 ..) and Windows Firewall.
Make sure you are registered as a licensed program in the vaccine program.