[SOLVED] Login Proxmox not working

N33T

New Member
Nov 19, 2025
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Hi guys,
I'm new to the forum and Proxmox. As a newbie I managed to get Proxmox working (and a few other things).
However, today I wanted to login again, but I get an Login failed: authentication failure (401) Please try again, message.
I am one-hundred-million precent sure that this is my password (using root to login).

Can I troubleshoot why login is not working? Logs? I am so lost, anyone who can show a newbie the/a way in these kind of scenarios?

I'm sure that I'm not the first and only problem with this issue but all the topics are also related to people who tried stuff and edited some important files, which is why they can't login. I tried nothing and changed nothing..
 
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do you have other means to access the system (SSH, IPMI, ..)? do those work?
 
Hi, @N33T .
I guess you're talking about logging in the web GUI (https://ip.ad.dr.ess:8006).

In the 3rd line of the login form (named "Realm") there's a drop-down menu.

Sometimes it is auto-selecting "Proxmox VE authentication server" instead of "Linux PAM standard authentication" in which of course your password doesn't match.

So: pay attention to select "Linux PAM standard authentication".

Does it work for you then? I'm asking because there can be some other reason, of course.