FTP Troubleshooting

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FTP Passive Mode

Passive ports are used to allow multiple FTP connections  by moving open FTP connections from port 21 to a port specified in the passive port range (40,000-40,100 is the standard ANS passive port range ). See relevant panel/cli doc pages for specific info on how the passive port range can be set.

If your FTP client is using passive mode, you'll usually see an output similar to the below. We can use this to calculate the port being used for passive mode (which we can then check for any restrictions on).

80,244,185,220,156,149  

First 4 numbers are the server IP,   

Multiply 5th number by 256 = x  

X+6th number = passive port which is being used  

156x256=39936+149=40085  

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