Hello @ThierryC , 

Could you give me the result of the following command: 

dnf list installed | grep "centreon-pack"

In addition, could you provide a screenshot of the “Administration > Extensions > Manager” page please? 

dnf list installed | grep "centreon-pack"

Hello,

No Centeon-pack installed. But no centreon-pack available with ‘dnf search’

All the centreon-plugin packages are installed.

Screenshots :

Hi @selkostali If you use IT-100 you don’t need to install centreon-pack packages.

These connectors are the only ones in grey or all connectors?

Hello, 

@Laurent, you’re right ! Thanks for the precision.

In addition @ThierryC, have you already tried to update the Centreon Monitoring Connector Manager ? https://docs.centreon.com/docs/monitoring/pluginpacks/#centreon-monitoring-connector-manager

I’ve found an other topic with a similar issue, but not sure if it really the same problem you are facing : 

Almost all the connectors are greyed.

I tried an update of centreon-pp-manager. The result is ‘Nothing to do do’ because already uptodate.

You can try to follow the procedure mentioned by @selkostali 

Hello.

 Problem solved.

I deleted the server (virtual), and create a new one.

Everything seems OK after a complete re-installation.

Thank you all.