This is SugarCRM Enterprise, Version 18.104.22.168 (Build 45)
So this instance all of a sudden won't let anyone log in. Here is the VERY non-descript/unhelpful error message:
Unable to sync with server. A request is failing that makes the application unusable. Please contact technical support.
It runs on Linux (CentOS 6.x) and the database is MySQL, and I have full access to a Linux terminal. I've restarted MySQL and Apache and the problem continues to persist.
Is there something useful being logged somewhere, and where should I look?