Using Flint (GL-AX1800) with Glinets OpenWRT Fork, newest stable version
Fibre Modem from Vodafone Germany
After setting the Internet Connection/WAN to PPPOE I input user name and password. It tries to connect but stops at the Registering new address step. In Luci it shows the "Unknown Error [User_Request]
I found this post PPPoE connection fails occasionally, 'Unknown error (USER REQUEST)' - #3 by it49xck but deleting the alias didn't seem to solve it for me.
User name I tried the simple username and the vodafone-ftth.komplett/username both didn't work. I contacted vodafone support and they told me simple username should be fine.
Any ideas how to solve this? Only idea I got is installing the beta firmware and see if that fixes it or completly switching to vanilla and trying it that way.
GL.iNet's fork is heavily modified and outdated.
The forums expertise is about genuine OpenWRT.
So for GL.iNet's software better ask at their forum.
Or install genuine Openwrt
It appears you are using firmware that is not from the official OpenWrt project.
When using forks/offshoots/vendor-specific builds that are "based on OpenWrt", there may be many differences compared to the official versions (hosted by OpenWrt.org). Some of these customizations may fundamentally change the way that OpenWrt works. You might need help from people with specific/specialized knowledge about the firmware you are using, so it is possible that advice you get here may not be useful.
Ask for help from the maintainer(s) or user community of the specific firmware that you are using.
Provide the source code for the firmware so that users on this forum can understand how your firmware works (OpenWrt forum users are volunteers, so somebody might look at the code if they have time and are interested in your issue).
If you believe that this specific issue is common to generic/official OpenWrt and/or the maintainers of your build have indicated as such, please feel free to clarify.