I am currently out of town, and my server went down. All my services go through nginx, and suddenly started giving error 502. My SSH won’t let me in. I had my sister reboot the server, and it still doesn’t work. I apologize for the lack of details, but that is all I know, and I can’t access logs. I’ve cleared cache, and used a VPN in case fail2ban got me. I recently got a tp link router, so it could be something with that, but it was working for a while. I will have her do another reboot, and if that doesn’t work I will have her power off and unplug the server in case it was hacked.
Edit: I have absolutely no clue why, but it works now. I literally did nothing. As far as I know, my sister hasn’t touched it today. It just started working. Computers, man…
Edit 2: Actually she said she did something. Not sure what, but it works now.
Are you by chance using something like Cloudflare? It may be possible that during the reboot the static IP changed, so your “gateway” cannot reach your router on your old IP no more?
In other words : it’s always the DNS?
It’s not the DNS. That was the first thing I checked. Also, I don’t use cloudflare.