If it does not respond, enter the correct hostname in the configuration files, then restart the network and try again. Invalid FTP host: Use the ping command to check the connection to the FTP host.Depending on the cause, try the following steps to get rid of the bothering error message.
The most common reasons for error 421 to show up are invalid FTP hosts, firewall and anti-virus software restrictions, and service configuration errors. The range of 4xx errors are temporary conditions, meaning that the action may be requested again. Another common FTP error is error 421 along with the error message “service not available.” This return code lets you know that there was a problem with the connection and your requested action.
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