Browser to access Intranet access everything is normal, the network can even on site, but no response, after the input password is normal with FlashFXP,
Use vb.net program step by step to check, found no problem login process, send the NLST command should return to normal after the code 125, but the returned is an empty message,
Current server router map the ports 21, tried to increase 20 port mapping, tried on the server access station firewall to allow the port, 20, 21 tried to close the firewall,
No change, is the same as a result, ask for help!

Chrome browser cannot access Internet explorer can!
Network normal together, which browsers can, vb.net application can access,