pyinstaller --onefile

[Marbelous]

this is not very descriptive. What error do you get when you run the exe from cmd? I would guess there is missing imports (i.e. some of the third-party packages is not included with the bundle).

I don't get any error. what I see is the exe is running for unlimited long time and never closes until I close it.
How can I find which module is not included , I mean How I can find a debug log or such log to clear the problem?
Thank You

You can't see anything about what was included with the --onefile option. You need to use the standard method of building to a folder first so you can ensure that all the imports were handled properly.

https://pyinstaller.readthedocs.io/en/st...o-one-file

I haven't used pyinstaller much in the past but have a couple big(ish) projects I'm about to try it on. See what you get using the folder method and if you still can't figure it out I'll try building your code too. I don't see anything problematic in your code except maybe the Windows IIS stuff.