Nextbox didn't send any data

Hi. My nextbox does not respond anymore to requests via https. It just says

xxx.xxx didn’t send any data.
ERR_EMPTY_RESPONSE

The LED is still green, and I can access via SSH. What shall I check? Please advise…

Best
Ben

Hahaha. Ein Boot tut immer gut, as we say in German…don’t know exactly what the problem was, but

sudo -i
reboot

did the trick. @daringer or anyone else competent: What’s the correct way to reboot via SSH?