FTP connection drop after PORT command: 421 Service not available, remote server has closed connection

Created:

2017-01-11 11:19:27 UTC

Modified:

2017-08-08 13:46:12 UTC

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FTP connection drop after PORT command: 421 Service not available, remote server has closed connection

Issue Symptoms

When opening an FTP connection (active or passive) to the server, after the PORT command the connection is dropped wth resulting error message in client:

421 Service not available, remote server has closed connection

Conditions

Your hosting provider or your network equippment is dropping the connection after specific PORT command.

Resolution

Contact your network administrator to check your router/NAT/firewall connected to the server as such device is dropping connection after some FTP commands

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