To be fair, turning it off and on again is unreasonably effective.

I recently diagnosed and fixed an issue with Veeam backups that suddenly stopped working part way through the usual window and stopped working from that point on. This particular setup has three sites (prod, my home and DR), and five backup proxies. Anyway, I read logs and Googled somewhat. I rebooted the backup server - no joy, even though it looked like the issue was there. I restarted the proxies and things started working again.

The error was basically: there are no available proxies, even though they were all available (but not working but not giving off "not working" vibes).

I could bother with trying to look for what went wrong but life is too short. This is the first time that pattern has happened to me (I'll note it down mentally and it was logged in our incident log).

So, OK, I'll agree that a reboot should not generally be the first option. Whilst sciencing it or nerding harder is the purist approach, often a cheeky reboot gets the job done. However, do be aware that a Windows box will often decide to install updates if you are not careful 8)