After upgrading from 24.04 to 25.1 I found that I couldn’t install apps via the catalog page. After digging down I sequentially found that I couldn’t connect to Docker at all, and then digging further I discovered that my system is completely unable to perform DNS lookups via UDP. Forcing TCP allows…

Hm okay I definitely missed this deadline but I guess my follow-up question would be is this related to a system-wide networking thing? When I dig any URL it times out, not just docker URLs. If this is the underlying issue then I assume the only fix would be to re-install the OS?

Post how you have your networking set up. Others will use that to make advice or try to diag the problem. Looking for things like if using DHCP or static ips with manual configuration for routing, etc. Are you using a bridge or have more advanced network setup. Is there a firewall setup?

My networking hardware setup is very basic, TP Link CR700 modem/router. No firewall on the router currently. Here’s my network config on TrueNAS. I have DHCP on and my network interface is enp0s31f6 for whatever that’s worth [Screenshot_20260729_112029]

Could it be the port 53 binding of incus blocking dns request since incus was not in 24.04?

Any insight on how I could check or test this? The only place I’ve seen 53 is when I run a dig command in the shell it says ; ; communications error to 8.8.8.8#53: timed out. Also when I run dig forcing TCP it is able to connect and shows SERVER: 8.8.8.8#53(8.8.8.8) (TCP)

you could try to rebind the incus port and free up port 53 This command from shell rebinds the incus port from 53 to 5354 sudo incus network set incusbr0 raw.dnsmasq="port=5354" My thinking is that incus grabbed port 53 for itself and now truenas doesn’t have access to port 53 fort its reseolved …

It’s telling me that incus isn’t set up. I get: root@truenas[~]# sudo incus network set incusbr0 raw.dnsmasq="port=5354" If this is your first time running Incus on this machine, you should also run: incus admin init To start your first container, try: incus launch images:ubuntu/22.04 Or for a virt…

Ok good, well not good, but at least one definite reasong others had issues ruled out.

Please also post a screenshot of your interface config. Do you have a bridge with no IP, but the IP on enp0s31f6?

Here’s the interface config, I think. I don’t even know how to answer that question haha I apologize I’m fairly unfamiliar with networking stuff. I don’t think I have a bridge? [Screenshot_20260729_134036]

UDP DNS lookup blocked on my system after upgrading to 25.1 (from 24.04)

TrueNAS General

dain August 4, 2026, 5:26pm 17

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UDP DNS lookup blocked on my system after upgrading to 25.1 (from 24.04)

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