I'm using an ispconfig multiserver with a proxy server at front and some servers at the back in a private network When I create an ftp user on the proxy server(master server), the user can connect to it, but when I change the server to a backend server(proxied server) or create a new ftp user on it, the server responds "530 Login authentication failed" This is the output of the FileZilla logs: Status: Connecting to MyIP... Status: Connection established, waiting for welcome message... Status: Initializing TLS... Status: TLS connection established. Command: USER user1 Response: 331 User user1 OK. Password required Command: PASS ******** Response: 530 Login authentication failed Error: Critical error: Could not connect to server Can anybody help me?