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Then the client connects its command port to port 21 on the server, but instead of using a PORT command, it sends a PASV command which tells the server that the connection is set in passive mode. Kindly let us know if the above helps or you need further assistance on this issue. First, the FTP Client opens two dynamic ports - a command port (for example port 1025) and a data transfer port (the command port +1 port 1026).
Please refer to the below similar issue : Test case: If I have opened ports 10001-10005 in Passive mode, then I need to add ports 10001-10005 in my Load balancer rules as below: For example, if you configure port 65520 to 65530 in Passive mode, then you need to create rules for those ports in Load balancer so that it forwards the traffic to the backend server. You need to create rules for each of those ports in Load balancer individually. My image is "explicit proxy for FTPS" about such as above feature.Using Azure Load balancer seems to be the best way to forward FTP traffic in Azure but there is no way to add a port range in load balancing rules.
I looking for a solution with Fortigate(FortiOS) to dynamically open the required FTPS-data port on Firtigate(firewall) with passive FTPS mode.ġ.When the client initiates a Control session(send Request:PASV), and get Response(with Data Port) from Server.Ģ.The firewall extracts the Data port number from the Response packet.ģ.The firewall then records both the client and server's IP addresses and port numbers in an FTPS-data pending request list.Ĥ.When the client later attempts to initiate a data connection, the firewall compares the connection request's parameters (ports and IP addresses) to the information in the FTPS-data pending request list, to determine whether the connection attempt is legitimate.ĥ.Since the FTPS-data pending request list is dynamic, the firewall can ensure that only the required FTP ports open.Ħ.When the session is closed, the firewall immediately closes the ports, guaranteeing the FTPS server's continued security.
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