Table of the most frequent errors in FTP clients Step by Step

Here is a table of some of the most frequent errors that you may encounter while using FTP clients:

Error Code	Error Message	Description
421	Service not available, closing control connection	The FTP server is busy and cannot accept any more connections. Try again later.
425	Can't open data connection	The FTP client was not able to establish a data connection to the server. This may be due to a firewall or other network configuration issue.
530	Login authentication failed	The FTP client was not able to authenticate with the server using the provided username and password. Check that the credentials are correct and that the account is active.
550	Permission denied	The FTP client was not able to access the requested file or directory on the server. This may be due to incorrect permissions, or the file or directory may not exist.
553	Could not create file	The FTP client was not able to create the requested file on the server. This may be due to incorrect permissions or disk space issues on the server.
226	Transfer complete	The FTP client successfully transferred the requested file to or from the server.
421	Timeout detected	The FTP client timed out while waiting for a response from the server. This may be due to network connectivity issues or a problem with the server.
550	File not found	The FTP client was not able to find the requested file on the server. Check that the file exists and that the path is correct.
425	Unable to build data connection	The FTP client was not able to establish a data connection with the server. This may be due to a network configuration issue or a problem with the server.