What you are is in deep need of being removed from your post.

Are you even an FDM developer? I'm not sure why you are so defensive of what is certainly a bug in the software, but don't worry: I won't be spending more of my time attempting to contribute to this project.

Excuse me, you should resume the download, not restart it.

...and for good measure, you can save the resolved URL if you wish and paste it back in after you get the error. Resuming will now work properly.

Or you can restart the download, losing all existing progress. That works too.

Problem : Sometimes when resuming a file in v3.9.6 build 1614 (maybe others too), the mysterious catch-all error "Unknown Server Error" is reported. Analysis : The source code is using IR_SERVERUNKERROR as a catch-all error code in several situations that have nothing to do with server er...

When the maximum number of connections per server (network settings) is not a multiple of permitted connections sections per file (set in new downloads\advanced) , connections are not properly distributed to files. In particular, over time FDM stops assigning connections to some files, and eventuall...