Alma Linux 9, Nginx Proxy Manager Networking Issue

Operating Systems & Open Source Linux
1

Hello All,

I had an Alma 9 server that contained only NPM running in a docker container that suddenly stopped accepting pings / ssh / http requests outta nowhere. After some initial troubleshooting making sure that nothing obvious was broken like network config, firewall blocking, etc I moved NPM to my DNS server and moved on. Today that server is now unable to accept pings, ssh, I can’t access either NPM or PiHole’s UI. Via the server console I can ping everything on my network. Any thoughts on what could be going on here? I’m at a loss as to what could be happening. I’ve not had any issues running NPM with this same build for months until now and it cropped up outta nowhere not even instigated by patching or even a service restart

Thanks,

c2cahoon

2

Netstat show the ports are being listened on. I can use CURL and SSH 127.0.0.1 to confirm the services are accepting requests locally. Nothing from outside seems to make it in.

I removed docker and rebooted, no change.

Added a second interface and confirmed that it was not a problem with the first interface.

3

Seems like it was something to do with TailScale on the server. I’m not sure what’s breaking but when I removed it it appears to work now.