Summary

This knowledgebase article explains how to install a plugin on a single server from a Neverfail Engine pair/trio when the other servers (Secondary/Tertiary) are not connected.

More Information

Once Neverfail Engine has been fully deployed on a pair or a trio it will no longer allow the installation of a plugin unless all the servers in the pair/trio are connected and replicating. The reason for this is that when a plugin is being installed, the new files and settings have to be replicated from the Active server to the Passive servers too in order to keep those machines in a clone state.

However, in the rare case where connectivity to Passive servers can't be provided and a plugin has to be installed on the Active server, this can be achieved by following the steps below.

1. Stop the Neverfail Engine service.
2. From the Engine Management Service (EMS), browse to c:\ProgramData\Neverfail\VAD\catalog\plugins and manually copy the files (dlls) of the plugins you wish to install in the `Neverfail\R2\Catalog` folder.
3. Open Regedit and navigate to [HKLM\SOFTWARE\JavaSoft\Prefs\neverfail\current\/Controller] hive.
4. Edit the `IsServerConfigured` value false.
5. Start Neverfail Engine service.
6. Open Engine Advanced Management Client UI and install the plugin from the Applications\Plugins section by using the Install button.

 Important Note: This procedure will only install the plugin on the local server and therefore the other servers in the pair/trio will not have the plugin installed and so the protection of the new application can't be achieved by Engine. To fix this you will need to re-clone the Secondary/Tertiary server or make those machines Active and repeat this manual procedure for installing the plugin on those machines too. 

Applies to

Neverfail Engine