I have been having repeat issues with the Sonicwall SSO Agent/Directory Connector showing offline (red) in the SSO Agent settings in the Sonicwall. After trying multiple fixes I finally found one that works. The issue is caused by the default configuration that the installer creates having issues and these steps below will re-write that with the correct information and allow the service to work properly.
Start by loading the Directory Connector Configurator application and then change the Shared Key using the auto-generated key. Copy the key and paste it into the Sonicwall SSO Agent configuration and apply the new settings in the Sonicwall and the Directory Connector Configurator. Once this is done follow the steps below in the screenshots. Once these steps are complete it should show as online (green) in the SSO Agent settings. If it does not please let me know and I’ll see if I can find a fix. Also if you have Sonicwall support I would suggest giving them a ring and see what they say.