

Today morning I started searching for more about this message. I have saved the screenshot of the popup I received. This time I didn't face any trouble to access the web server. I deleted the entire FTP cache and entered the FTP server access details manually once again. Since I was in a hurry, I couldn't troubleshoot the issue by myself. This tutorial explains the reasons and solution of " 503 Login Authentication Failed". One time it showed a different alert with the same code. I tried to log in to web host account a few more times but received the same error. I have checked the username, password and host address once again but they are correct. However, I do not believe it is an issue with FireFTP. I had been using FileZilla before migrating to FireFTP but it never showed such a problem. I have been using FireFTP as my FTP client for one year and I never faced such an issue. Yesterday while trying to access my web hosting account, I received an error message " 503 Login Authentication Failed".
