By default, AD Connect logs activity to the Windows Event Viewer with the following source names:

Agent Source Name

AD Connect Agent

AuthenticationAgent.exe

AD Connect with IIS

SSO

Provisioning agent

Provisioner.exe

Update monitoring agent

SoftwareUpdates.exe

Configuration monitoring agent (IIS only)

ConfigurationService.exe

To view these logs, go to Logs > Application in the Windows Event Viewer.

You can configure both the IIS and non-IIS versions of AD Connect to log events to a log file in addition to the Event Viewer.