Graylog GUI isn't working after SSO plugin installed

[smolit]

Hello Communnity, I tried to install the SSO Plugin to my Graylog test setup. After copying the jar file to the plugin folder the Graylog GUI dosn't work. The only log entry I can find is: graylog-server[16756]: Exception in thread "main" java.lang.NoClassDefFoundError: org/graylog2/security/realm/LdapUserAuthenticator and graylog-server[16756]: Caused by: java.lang.ClassNotFoundException: org.graylog2.security.realm.LdapUserAuthenticator

Currently I am using LDAP as authentication service.

I have no idea what problem here occures and wold be happy if I can get any help.

Thanks Sebastian

Steps to reproduce the problem

1. copy the jar file to the plugin folder
2. restart graylog-server service

Environment

• Graylog Version: 4.0.5+d95b909
• Plugin Version: 3.3.0
• Elasticsearch Version: 7.10.2
• MongoDB Version: 4.0.23
• Operating System: ubuntu1804
• Browser version: Microsoft Edge Version 89.0.774.50, Firefox 86.0.1 (64-bit)

[bernd]

@smolit As stated in the README, the SSO plugin is not compatible with Graylog 4.0.

The core functionality (HTTP header authentication) is now included in the server since 4.0.

[smolit]

Oh! I am sorry. I should read the README more carefully ;-)