[Bug]: Linux Desktop version loose token after network reconnect

[alexander-potemkin]

⚠️ Before submitting, please verify the following: ⚠️

• [X] This is a bug, not a question or a configuration issue.
• [X] This issue is not already reported on Github (I've searched it).
• [X] Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• [X] I agree to follow Nextcloud's Code of Conduct

Bug description

I'm using 3.5.3 Linux version and every time my laptop loose and regain connectivity, NextCloud stops syncing and appears to be offline. None of my actions bring it back online and after some time it shows a window requiring to grant authorization to the app (in the web browser).

Steps to reproduce

1. Open NextCloud
2. Do your things
3. Disconnect your network (iPhone lost network in my case)
4. Reconnect to the internet
5. Done

Expected behavior

I was expecting it would reconnect once the network is there (like it does on MacOS).

Which files are affected by this bug

all?

Operating system

Linux

Which version of the operating system you are running.

Linux Mint 20.3

Package

Appimage

Nextcloud Server version

4.13.2

Nextcloud Desktop Client version

3.5.3

Is this bug present after an update or on a fresh install?

Fresh desktop client install

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

Are you using an external user-backend?

• [ ] Default internal user-backend
• [ ] LDAP/ Active Directory
• [ ] SSO - SAML
• [ ] Other

Nextcloud Server logs

No response

Additional info

No response

[koenr]

I can confirm this behaviour on Ubuntu 20.04, Desktop client 3.5.2, kernel ubuntu-5.4.0-122-generic I have to restart the Nextcloud Desktop client to restore the connection. I didn't see it asking for authorisation, but may be I'm not patient enough.

[camilasan]

Does this still happen with the 3.6.0-rc1? https://download.nextcloud.com/desktop/prereleases/Linux/Nextcloud-3.6.0-rc1-x86_64.AppImage

[gregor-j]

The problem doesn't appear with 3.6.0-rc1 anymore on Ubuntu 20.04.

[Anarch157a]

Problem still happens on Debian unstable with 3.6.0 AppImage

[erdnuesse]

Confirming Nextcloud version 3.6.4git on 6.0 Arch-Repo (endeavourOS), Issue persists. [Edit:]

• Confirming Nextcloud version 3.6.4 (build 12825) AppImage, Issue persists.
• checked a fix from someone in another (closed, stale) thread, to redirect https; got myself a certbot and ssl-only config, no change.
• checked App Token, connecting worked, Issue persists.
• current task: checking different solutions and products. This issue is stale for over 2 years now, if my research over all bugreports was correct.