On Wed, 20 Jul 2016, Dan Donahue wrote:

Downloading via sftp sees significant decrease in speed and eventually stalls without any indication of error or timeout. Download never resumes following the stall.

The same result occurs using the curl command line tool.

With 7.44.0 average sftp download speed is ~3MBs/sec. With 7.49.1 speed registers initially at ~100KB/sec and slowly increments to ~600KB/sec. With large files (256MB) the download stalls and does not recover. No SSH disconnects or errors are seen on the server (until my abort logic).

Strange! Any chance you can bisect down to a suspected commit that introduced this behavior?

Setting the FTP_RESPONSE_TIMEOUT option to 10 seconds (< progress timeout logic) does not cause a timeout.

That option is for FTP only and that is pretty clearly stated in the documentation I think. SFTP is not FTP. The option is completely meaningless for SFTP transfers.

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