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Filetransfer fails when an older client (eg. 1.4.3.6) connects to the newest server (1.8.2.4) #385

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@ScherzerThomas

Hi,

i've encountered the issue that the file transfer fails when using an old viewer (1.4.3.6) in combination with the latest server (1.8.2.4).

Upload (from viewer to server) works normally.

Download of large files (>>1MB) fails immediately with following error message and the vnc viewer terminates:
Image
Download of very small files (few KB) works usually.
Download of files up to a few MB sometimes causes no immediate failure, but freezing of the file transfer dialog and a progress staying at 0%.
But after pressing "Forced Stop" the same error message appears.

Encryption via SecureVNCPlugin64.dsm was enabled, but it doesn't change the behavior (I've tested both constellations)

This is the server log:
vnc_filetransfer_log.txt

File transfer with this client (1.4.3.6) worked in combination with server version 1.6.4.0, so the issue was introduced in the latest versions.

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