[NET-700] FTPSClient FTP File transfer, failure on Android 11

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: FTP

Environment

Android 8, 9 and 10 work OK, 11 does not. Standard phones (mostly Samsung), an A40 has Android 11 on it.

• Assignee: Unassigned
• Reporter: EDMUND ROBERT TODD
• Created: 27/Apr/21 17:35
• Updated: 28/Apr/21 13:08

Description

I have an Android app which does, among other things, FTP uploads and downloads with a file server. Up to Android 10, all is fine, but I'm getting problems with Android 11.

I have opened a FileStream. Available shows the right byte count, and a read returns a byte array with the right data in it, so I'm pointing in the right place and my Android/Java app can handle it fine. A FTPSClient (3.8.0) storeFile creates a file on the server, but the data is totally corrupt. The application also locks, the storeFile never returns until I am forced off the server. It's all in a try/catch, with enough catches to choke an elephant. All files are in a folder within my application 'sandbox'. As I said, my Java code can handle the file.