this post was submitted on 31 Mar 2026
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Weird networking issue, seeking help (piefed.ca)
submitted 3 days ago by iamthetot@piefed.ca to c/linux@programming.dev
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I run CachyOS on my desktop. I host Homepage for myself on a home server. This is reached at home.mydomain.tld. Pihole on my local network catches that request and points it at my local nginx, which reverse proxies me to the homepage.

Now, I set this all up a while back and it all worked totally fine for several weeks. Then, about a week or so ago, for some reason almost every, but not every time I boot my PC, home.mydomain.tld gives me a "cannot be reached" error in my browser... until I run systemctl restart NetworkManager and then it works completely normally.

Can anyone help me troubleshoot why oh why that would suddenly be a thing? Does anyone have suggestions of a way I can troubleshoot a permanent fix to this so that I don't have to restart NetworkManager almost every boot?

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[–] iamthetot@piefed.ca 1 points 2 days ago (1 children)

No, the DNS calls do not show up in pi-hole log when it's not reaching destination. If I do it from my phone, which works fine and has never not resolved for me, they show up on pi-hole as expected.

[–] Petter1@discuss.tchncs.de 3 points 2 days ago

Hmm, interesting…

But we learned now, that your desktop somehow isn’t reaching your DNS (pi-hole) until restart of Network Manager

So next thing i would do is traceroute and dig on your desktop while it is not working, to see what DnS is used in this state