L2Walker not working in every C1 server

I was using L2Walker on a C1 private server and it was working fine. But in others C1 servers, it doesn't work. I know how to use L2decrypt, I know how to determinate IP, port and protocol. But i tried with 2 extra servers wich port is 7777, and I obtain the clasic LoginFail error. I don't know if the parameter ServerList has something to do, or not. Any idea?

which version of Walker u use? For C1 u should try 10.2.3 or Ingame Walkers ;)

set the port in the walker to 2106, 7777 is game server port not login port ;)

protocol is 419/786