[NET-642] FTPSClient execPROT removes proxy settings

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.6
• Fix Version/s: 3.9.0
• Component/s: FTP

Environment

Java 1.8.0_112
Linux 64bit

• Assignee: Unassigned
• Reporter: Johannes Frank
• Created: 17/Jul/17 12:13
• Updated: 03/Jun/24 13:18
• Resolved: 07/Nov/22 15:20

Description

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.

Issue Links

• is related to: NET-718 "Unsupported or unrecognized SSL message" for FTPS via proxy
• is related to: NET-731 FTPSClient no longer supports fileTransferMode (eg DEFLATE)
• is related to: NET-726 Add protected getters to FTPSClient
• relates to: NET-637 FTPSClient not using the Socks Proxy when opening passive data connection
• links to: GitHub Pull Request #27
• links to: GitHub Pull Request #90
• links to: GitHub Pull Request #118