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Enable logging to file and reboot. Check the log file for errors why the server didn't come online.

That's the wrong question to ask. The correct question is: How well does IIS follow the protocol specifications, so that it works with each, any and all FTP clients?

FileZilla Server is currently being rewritten from scratch.

Patches can be submitted through the issue tracker in the form of unified context diffs. Patches need to be of high quality if they are to be accepted. If a patch adds new functionality, it also needs to fit the project's vision.

Do you still experience this issue after switching to a non-garbage-collected language?

Have you tried rebooting yet?

What's the latency between the client and the server machines?

How are the speeds if you connect using localhost using a client running on the server machine itself?

Outdated versions are especially and particularly not supported. It's time you buy new hardware.

Which client software are you using?

Windows Vista (and it's server rebrands) are not supported. FileZilla Server requires Windows 7 or newer.

There's no such functionality.

Normal programs cannot cause bluescreens, the very design of modern operating system is there to prevent this.

This means that there's something wrong with your system. Could be corrupt system files or a bad driver. Last but not least, it could also be faulty hardware.

The data connections too require handshakes, one for each new transfer. In any case, handshake performance depends a lot on the used handshake algorithm. If you connect to your server using FIleZilla and then click the lock icon in the status bar, what does it list as TLS version and key exchange al...

In order to connect with a third-party server you need to use an FTP client such as FileZilla.

FileZilla Server on the other hand is an FTP server, it's administration interface can only be used to administrate FileZilla Server.

It should work fine using Wine.

Are you using the same protocol in both versions? Note that 3.6 is insecure, it does not default to FTP over TLS.

Try removing your snake oil.