Issue WP Toolkit, unable to log in to Wordpress Backend (500 Header Values must me RFC 7230 compatible strings)

[fpanzer]

Server operating system version

Ubuntu 24.04

Plesk version and microupdate number

Plesk Obsidian 18.0.77 Update 4 Web Host Edition

When using the login button for a wp-toolkit enabled Wordpress Instance

i get a new tab where it says
"Anmeldeinformationen des WordPress-Administrators werden abgerufen. Bitte warten...", then after a few seconds i get

{"meta":{"status":500,"message":"Interner Serverfehler: Header values must be RFC 7230 compatible strings"}}

Plugins, Themes etc. can be retreived from the wordpress instance without any problem.
Directly logging in to domain.tld/wp-admin works.

Any advice, anyone?

 

[alapshin]

Hello @fpanzer
Please check if WP Administrator name contain only alphanumeric symbols, white space characters, the @ sign, dot, dash, and underscore symbols.
For thorough investigation I suggest you to create ticket to Plesk Support.