Very strange issue. I am managing a friends unRaid server through a VPN. I realized he didn't have a root password set, so using the web gui, i went ahead and set it. I use a password manager, i generated the password and saved the new password profile, then copy/pasted it into the new password field (and the second confirm field). After hitting "Change" it prompted me for a password to login to the web gui. I entered "root" and the new password and it didn't work. Huh? If i SSH into the server with root and the new password, it works fine. What the heck? Any idea what would cause this? this is on unRaid 6.3.4

Ok, i probably should have spent more time troubleshooting before starting a thread. It looks like the password i choose, the web gui didn't like. Is there any restrictions with passwords? This password was 30 characters in length and had a mix of letters, numbers, spaces, special characters, etc. including brackets. I re-did the password removing brackets and reset it via the console and the web gui is working again.

There was a fix for passwords some time ago, but you probably managed to find another bug  Might be one of the characters that wasn't liked. I guess @bonienl might know better.