If you hit some of published calendars in Web Calendar publisher host, your browser just spins until bad gateway error is displayed.
There is a bug in our code. If any appointment in a published calendar has attachment of few MBs, then previewing it via publisher calendar host cause this problem. Furthermore, for end user, if he clicks on such published calendar, any other published calendars show the same symptoms. he will need to close and restart the browser and then other users published calendars will work again until he clicks on a bad one.