Have you used dmesg to see what the interface is doing?

Have you tried reloading the kernel module used by the interface?

Tried using a different kernel module?

Is SELinux enabled?

Run a packet capture to see what connection attempts are being made, if any?

Just spitballing.

Have you tried using Debian instead 😂

Have you tried these troubleshooting techniques with NetworkManager not running? NM will fuck you up sometimes because it will change things with no indication of what it changes.

If you’ve ever royally fucked something up in git, that hotline is necessary