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This article applies to: ML v7, ML8, MultiStore

"Service Unavailable" Errors After Enabling Event Handlers

After enabling one or more Event Handlers, your site thows 'Service Unavailable' errors

This can happen when the listener that your site is configured to connect to for your Event Handlers is not available.  The site may function normally, until an event fires a callout to the listener.

Verify that your listener is active and responding.  If this cannot be done, you will need to disable your Event Handlers by setting the Active values to 0 in the EventHandler table in the DB.