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The TCP port usually used for FTP connection is port 21. Most often the reason for FTP time out is that your firewall or Internet service provider blocks this port or because your FTP client is NOT set to use Passive mode. First of all you should make sure that you use Passive mode with your FTP client. Then, if the problem persists, you should run a check of the connection between your computer and the port 21. If there is a problem with the connectivity you should try disabling your local firewall, or, if this does not help, you should contact your Internet Service Provider.

For information on how to check whether your FTP port 21 is blocked, you can refer to this article.

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