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This article mainly introduces how to display 421 Service not available when logging in to the ftp server, the article is very detailed, has a certain reference value, interested friends must read it!

When you log in to the server, it displays:

[root@station10 ~] # ftp server1

Connected to server1.example.com.

421 Service not available.

Ftp > bye

[root@station10 ~] #

Use chkconfig to check whether the service is started by only one ftp, and then restart the vsftpd service, or not, reinstall the service, and check the log to find no specific reason.

Both iptables and selinux checked, and the result was the same error report.

Finally, find out that the reason is that hosts.deny has banned the service. It is difficult to find the reason for this situation, because there is no log information, so we can only look at experience.

The above is all the contents of this article "how to display 421 Service not available when logging in to the ftp server". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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