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https://issues.apache.org/jira/browse/NET-642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121397#comment-16121397
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Johannes Frank commented on NET-642:
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Setting it to critical because we already have two customers now that can't
switch from FTP to FTPS due to the need of going through a Proxy.
> using execPROT on FTPSClients with Proxy Settings removes Proxy Settings
> ------------------------------------------------------------------------
>
> Key: NET-642
> URL: https://issues.apache.org/jira/browse/NET-642
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 3.6
> Environment: Java 1.8.0_112
> Linux 64bit
> Reporter: Johannes Frank
> Priority: Critical
>
> In Reference to https://issues.apache.org/jira/browse/NET-578
> I'm trying to establish an FTPS Connection via a HTTP Proxy. The Control
> Connection is properly established, however the Moment I do execPROT the
> Proxy settings are resetted by call to setSocketFactory(new
> FTPSSocketFactory(context)); in FTPSClient.java:534.
> This causes FTPSClients with a call to execPROT to actually ignore the proxy
> settings and attempt to contact the FTPS Server directly for data connections.
> Since we are required to use PROT P this is currently blocking our feature
> for FTPS Connections via HTTP proxy.
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