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paintchip
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Joined: 02 Jan 2010
Posts: 57
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 Posted: Mon Jul 18, 2022 10:29 am Post subject: Can't Open Applications After Connecting to Network [SOLVED] |
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As the title says, I think I caused an issue where after connecting to a WiFi network, applications, settings, etc. don't launch. Any help is appreciated because I can't find the connection here. Also, I'm using KDE, if it matters.
It started after I tried to get NetworkManager to use dnscrypt-proxy instead of the router provided DNS settings. This setup worked before on previous routers, so I don't think it's dnscrpyt (or from the router, which worked fine as well without trying to use dnsproxy).
While reading the Arch wiki I attempted to stop NM from updating resolve.conf by running | Code: | | sudo chattr +i /etc/resolv.conf |
I noticed things not launching after that. I tried reversing the changes by running | Code: | | sudo chattr -i /etc/resolv.conf |
and even by removing the file and remaking it. None of it has worked.
Everything seems to work normally until after I connect to a network (I've tried more than one). I can also switch terminals with Ctrl + Alt + F2, run startx, and the second session works normally, all of the applications launch.
While launching applications from the terminal, I get the following errors. I've looked them up, but I can't find any connection to NetworkManager.
Firefox:
| Code: | Authorization required, but no authorization protocol specified
Error: cannot open display: :0 |
Dolphin:
| Code: | Authorization required, but no authorization protocol specified
qt.qpa.xcb: could not connect to display :0
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: minimal, offscreen, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.
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Last edited by paintchip on Tue Jul 19, 2022 10:05 am; edited 1 time in total |
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alamahant
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Joined: 23 Mar 2019
Posts: 3879
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| Posted: Mon Jul 18, 2022 11:00 am Post subject: |
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Are you accessing your system remotely somehow?
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paintchip
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Joined: 02 Jan 2010
Posts: 57
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| Posted: Mon Jul 18, 2022 12:31 pm Post subject: |
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Thanks for the reply. No. This is all local. Possibly related, I don't use a DM and start KDE with startx and this command in my.xinitrc
| Code: | | exec dbus-launch --sh-syntax --exit-with-session startplasma-x11 |
That's been working for a while, though.
Edit: I also tired logging out of the initial KDE session and having startx start a new one. Applications launched after that, even if I disconnected and reconnected to different networks. I did have to logout using the CLI, though. The buttons didn't work, just like the applications. |
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alamahant
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Joined: 23 Mar 2019
Posts: 3879
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| Posted: Mon Jul 18, 2022 12:48 pm Post subject: |
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Do you have a file
Try reemerging
But the reason why this happens after connecting to a wifi is a mystery.
Do you have elogind and dbus running?
Is your user member of audio and video groups?
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paintchip
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Joined: 02 Jan 2010
Posts: 57
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| Posted: Mon Jul 18, 2022 1:14 pm Post subject: |
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Thanks for the suggestions
I reemerged xauth, but it didn't fix it. I do have a .Xauthority file and it is populated with info.
dbus is running, but strangely, elogind shows as stopped. If I try to start it, it complains that elogind is already running. None of those services change states from when applications are launching and not launching, though.
My user is also in the audio and video groups |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 21715
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| Posted: Mon Jul 18, 2022 2:13 pm Post subject: |
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What is the output of hostname before and after you connect to a bad network? My guess is that your hostname is being updated as part of joining the new network. Your Xorg MIT auth cookie is hostname-locked, so changing the hostname prevents use of the old cookie. Starting a new X session under your new hostname generates a new cookie, locked to your new hostname, which works until you change networks (and therefore hostname) again.
This pops up a few times a year, though more commonly on new installs rather than someone who had a working setup, changed something, and suffered a mysterious break. |
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paintchip
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Joined: 02 Jan 2010
Posts: 57
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| Posted: Mon Jul 18, 2022 5:06 pm Post subject: |
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That's exactly what's happening. Before I connect to a network the hostname matches what I have in /etc/hostname. After I connect to any network it changes to localhost.localdomain. What I don't get is how or why it started changing or how to get NM to stop. From the few posts I just read the problem was in /etc/hostname or /etc/conf.d/hostname. Both of these are set correctly for me. I also don't see that option anywhere in the NM settings.
I'll keep searching. |
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alamahant
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Joined: 23 Mar 2019
Posts: 3879
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| Posted: Mon Jul 18, 2022 9:03 pm Post subject: |
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OK I think i found it it for you.
Plz edit
| Code: |
/etc/NetworkManager/NetworkManager.conf -->>
[main]
hostname-mode=none
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and restart NM.
According to
| Code: |
man 5 NetworkManager.conf
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| Quote: |
hostname-mode
Set the management mode of the hostname. This parameter will affect only the transient hostname. If a
valid static hostname is set, NetworkManager will skip the update of the hostname despite the value of
this option. An hostname empty or equal to 'localhost', 'localhost6', 'localhost.localdomain' or
'localhost6.localdomain' is considered invalid.
default: NetworkManager will update the hostname with the one provided via DHCP or reverse DNS lookup of
the IP address on the connection with the default route or on any connection with the property
hostname.only-from-default set to 'false'. Connections are considered in order of increasing value of
the hostname.priority property. In case multiple connections have the same priority, connections
activated earlier are considered first. If no hostname can be determined in such way, the hostname will
be updated to the last one set outside NetworkManager or to 'localhost.localdomain'.
dhcp: this is similar to 'default', with the difference that after trying to get the DHCP hostname,
reverse DNS lookup is not done. Note that selecting this option is equivalent to setting the property
'hostname.from-dns-lookup' to 'false' globally for all connections in NetworkManager.conf.
none: NetworkManager will not manage the transient hostname and will never set it.
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So apparently you have not set a proper hostname probably just "localhost"
It would be good to set a full FQDN even if it is a bogus one.
Maybe something like
| Code: |
my-machine.my-bogus-internal.domain
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Then all machines in your lan can share this internal domain.
Thanks Hu for pointing out this hostname thing.
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paintchip
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Joined: 02 Jan 2010
Posts: 57
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| Posted: Tue Jul 19, 2022 10:03 am Post subject: |
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Thanks for the reply. I had found that, but still ran into issues. My hostname was unique, but did contain an underscore, which I read can cause promblems. Also, the /etc/NetworkManager/NetworkManager.conf file didn't exist and creating it with the lines you provided didn't originally work.
I'm not sure which of the following fixed it, but I removed the underscore from the hostname in both /etc/hostname and /etc/conf.d/hostname, created the NetworkManager.conf file and added hostname-mode=none line under [main], and then actually restarted the machine (restarting NM didn't seem to work with a bunch of attempts).
The combination of the above solved the issue! Thanks a ton for all of the help, guys. I really appreciate it.
https://wiki.gentoo.org/wiki/NetworkManager |
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