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Setting up an FTPS server behind a firewall, NAT, reverse proxy, or other routing device for passive (PASV) mode data transfers
Posted by John Villanueva on 07 November 2016 12:30 AM

When your FTPS server is behind a firewall, NAT, reverse proxy, or other routing device, clients might encounter connectivity issues due to the fact that the firewall (or other routing device) can't read the source IP address and port number from the response packet. This can  be resolved by setting an external IP address for the "passive IP address" and specifying a range of passive ports.

The following article describes the problem in detail and explains how to resolve it in JSCAPE MFT Server:

Setting Up An FTPS Server Behind A Firewall or NAT For PASV Mode Data Transfers

 

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