FTP Error Messages Explained

This article provides an overview of the most common reasons which may prevent you from establishing an FTP connection.

It is often only minor errors that prevent a successful connection. Check for mispellings in your user name and password. Passwords are case-sensitive, so pay particular attention to which letters may be capitalised or not.

Error Message	Cause
421 Too many connections	The maximum number of simultaneous connections has been reached. End FTP sessions you no longer need. Some FTP programs - for example FileZilla - can use several connections per FTP session. Check the settings and reduce the number of simultaneous connections/transmissions if necessary.
The specified host is unknown. The FTP server (host) cannot be reached or is unknown.	Check your entry. In Web Hosting the server name must correspond to the format - homexxxxxxxxx.1and1-data.host or accessxxxxxxxxx.webspace-data.io. Example: home123456789.1and1-data.host or access123456789.webspace-data.io. If the FTP server is specified correctly, your FTP program may not be able to handle the.host extension as part of the server name. You can still use the program by configuring your own subdomain as an alternative server name.
530 Login authentication failed	User name or password incorrect. Forgot your password? Then simply assign a new one.
425 Can't open data connection	The FTP connection was established, but no data could be exchanged. A common cause is the use of the FTP program in active mode, which can lead to problems with network components such as a firewall or a router. Activate the passive mode in the settings of your FTP program.
550 Permission denied	This error occurs whenever you try to create folders or files in a directory where you have no rights.