Warning: One or more synchronization actions could not be completed because a connection could not be made to the MAS 90 and 200 Integration engine. Please check the configuration of the integration engine. The requested synchronization actions will remain in the queue and will be completed with the next synchronization request after the integration engine becomes available.
This happens when trying ot update a zip code in customer maintenance. I've seen this before but can't remember the fix - version 4.5, integration with Sage CRM, all services up and running.