iCal "server error" and “509” error
For the past couple of days when I try to add or change an event on iCal I get the warning triangle and when I click it I get "The server responded with “509” to operation CalDAVMoveEntityQueueableOperation." If I revert to server I get the unchanged post. I can't seem to make changes stick.
Today I decided to try and go straight to the calendar on iCloud. I can't even add an event there - it says "server error, please try again"
At the same time (as a result) the calendars are not syncing between devices (3 desktop and 1 laptop all signed in to my iCloud).
I LIVE on this calendar - how can I fix this??
Sigh.
iMac (21.5-inch, Late 2015), iOS 10, null