Support for Extended Passive Mode EPSV?

Question

I'm trying to connect to an FTPS server that requires use of Extended Passive Mode (EPSV). When starting the file transfer the FTP object is sending the standard PASV command which results in the following error.

[Rebex.Net.FtpException] No connection could be made because the target machine actively refused it.

Is EPSV supported by the Rebex FTP libraries and if so how is it configured when using FTPS?

There doesn't appear to be anything relating to this in the documentation, FTP object model or release notes.

For reference I am currently using an older version of the File Transfer Pack, version 1.0.4086.

Answer 1

Rebex FTP/SSL only uses Extended Passive Mode (EPSV) when connected to an FTP server using IPv6. It can't be currently configured to use EPSV for IPv4 as well. Do you simply need an option to force EPSV instead of PASV? That would be easy to add.

Comments

Unfortunately IPv6 isn't an option for us in this instance. If it's possible to also enable it on IPv4 that would be great. What's the general release strategy for things like this?

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Hello, do I understand correctly that adding the option which would force EPSV instead of PASV would fit your needs? If yes, we would be able to issue a hotfix in the beginning of next week which will include the option and send you a link to download.

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OK, we will add an option to enable it on IPv4. This will become part of the next release. Until then, we can provide a custom hotfix (based on the latest release) - it should be ready early next week.

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We added ForceExtendedDataChannelCommand options for the next release. It can be enabled by setting Ftp.Settings.ForceExtendedDataChannelCommand to true.

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This has been released with Rebex FTP/SSL 2014 R2.

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Thanks for adding this option. We've now upgraded to 2014 R2 and it's working a treat.