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From "Sebb (JIRA)" <>
Subject [jira] [Resolved] (NET-588) FTPClient.setPassiveNatWorkaround assumes host is outside site local range
Date Tue, 07 Feb 2017 20:05:41 GMT


Sebb resolved NET-588.
       Resolution: Fixed
    Fix Version/s: 3.6

Thanks for the report and the PR.

NET-588 FTPClient.setPassiveNatWorkaround assumes host is outside site local range


> FTPClient.setPassiveNatWorkaround assumes host is outside site local range
> --------------------------------------------------------------------------
>                 Key: NET-588
>                 URL:
>             Project: Commons Net
>          Issue Type: Bug
>          Components: FTP
>    Affects Versions: 3.1, 3.3, 3.4
>            Reporter: Dave Nice
>             Fix For: 3.6
> We have a NAT firewall between two "site local" 10.x networks. The effect is that the
FTP library tries to make data connections to the wrong host because the passive NAT workaround
doesn't operate if the FTP connection is made to a "site local" private address and the host
returned in the PASV reply is also "site local".
> I see that Damon Dan references pretty much the exact issue within bug NET-363 when the
workaround was originally introduced.
> Users with "site local" networks would be quite at liberty to subnet within the network,
I guess, to suit their administrative needs, so this seems like a valid issue.
> Options I can see:
> 1) Include a way of forcing the workaround in place
> 2) Remove the selectivity around rewriting the host only if the PASV reply is "site local"
and original host isn't... Issue here is around a server that has multiple endpoints for data
> 3) Allow the user to specify their own data host via API
> 4) Check for whether the PASV reply address is in a different subnet to the original
host we connected to and apply the workaround if so
> I haven't yet identified a workaround within the current code!

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