Hi,
I’ve been running Nixos successfully on a Thinkpad T480 since January. However, this morning, my device started refusing to connect to any site whatsoever. Connecting to e.g. a router works fine, and nmcli lists my connection state as full, but no hostnames (or ip addresses) resolve. Given that I can’t install new software, can anyone offer advice on how to debug this?
I’m on nixos-unstable. The only possible symptom I’ve noticed is that sudo journalctl -b | grep -i "net\|dns\|resolv" surfaces a message about ‘dbus-org.freedesktop.resolve1.service’ not being found, but I don’t think I’ve ever had that installed.
Things tried:
- Different connection types (wifi, ethernet, network via bluetooth).
- Connecting with different devices to isolate issue to my laptop.
- Rollback to a configuration from two weeks ago.
- Manually modify /etc/resolv.conf nameserver to 8.8.8.8 and 8.8.8.4.
- Reboot device.
- Reboot router.
- sudo systemctl restart NetworkManager
- nmcli radio wifi off/on
- manually edit
/etc/sysctl.confto disable ipv6 - Check iptables for REJECT lines
- Check ip addr show
- Connect to local devices, e.g. 192.168.0.1 (fails).
So I am officially out of ideas 
, any suggestions would be highly appreciated 
. Thanks!