hello. "you are disconnected from server" help plz

I downloaded MuOnline_SS12EP2 (full server/client)
And I use localhost IP (127.0.0.1) for test.
servers seem working well.
connections look good.
green button on.

But client doesn't connect to server.
Logs below here:

[ResourceGuard] Stop checking integrity.
Loading ok. [Connect to Server] ip address = 127.0.0.1, port = 55667
Failed to connect. 2020/08/17 20:45
Login Scene init success.
[Send Packet Error] WSAGetLastError() != WSAEWOULDBLOCK
[Socket Closed][Clear PacketQueue]

what could be the problem?
Thanks for your helps

- - - Updated - - -

my mistake was.... I set ConnectServer ip "127.0.0.1" of client main.exe
I changed it "192.168.0.103" my local ip.
then problem solved