Problem using Curl for FTP upload

I have an issue on one of the sites I manage when trying to connect out to an external FTP server. From a client on the network I am using Curl to process FTP uploads. I can connect to the FTP server manually using FileZilla and upload files successfully. However, when trying to use Curl it will not work without the argument "--disable-epsv" specified. This forces the connection into Extended Passive mode.

I assume there is something on my firewall blocking this connection but I cannot figure out what. Any help would be greatly appreciated.


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    Perhaps using the FTP proxy for this with Diagnostic logging set to Information will show you what is happening.

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