Calendar and Contacts just stopped working

Question

I have an odd issue creep up that Apple Enterprise support and I cannot seem to remedy, I am hopeful someone here might give me some insight.
Mac Mini Server, Running OS X Server 10.8.4.
A few users (no Open Directory)
Each user has their own contacts and calendars.
Each user can enter user and password to see server shares
As of yesterday each users account on their client Macs cannot access either contacts or calendars, the server keeps asking for the password within both calendar and contact apps, entering in the correct password still yields the error.
I have tried:
-resetting the password
-logging that user in directly to use the server be sure they can login, they can.
-resetting the password with must reset password upon next login checked
-reset all the services
-reset the databse for contacts and calendars via terminal
-removed keys from keychain
-looked at console and found errors, but they don't point to much
-restored the entire server from a TM backup when I know all was working fine. Did that and then accounts that were working no longer work, so it became worse
-apple is stumped, therefore I am starting phase 3 of digging deeper
Their suggestion at this point is a clean install of the OS which is a large undertaking and does not provide comfort as I am not sure what started this issue to begin with therefore it could come up again.
Any one out there with any ideas? I can provide more information if needed.

Answer 1

jakekub wrote:
Yes indeed will do that. Another item I found curious is some accounts I deleted and tried to create them again but got an error stating that I could not create that account because there was another one with that name. I checked this in terminal as well but even there the account could not be found.
This am I restored from a TM backup from July 1st and things are smooth. Apple Eng suggested instead of putting the same calendar and contact account on each client Mac so that multiple users have the same calendar and contacts accounts in order to read and write to those, instead use delegation for multiple calendars and contacts. The PostgreSQL will work more effieciently with delegation.
Any experience with this?
I had a situation very similar to yours some two years ago (Server 10.6).  Happened out of the blue as I was finishing setting up the server.  All of a sudden the calendar and contacts stopped working.  In their situation we had one account used just for calendar and contact.  Separate credentials for shares etc, and no OD.  I basically did everything you mentioned in the OP several times, hours on the phone w/ Enterprise Support.  Even escallated to Engineering but nothing worked.  Ended up doing a nuke and pave.
On the delegation versus adding each account thing.  I've done both ways and never had any problems.  In fact my production server has half a dozen separate accounts for major customers of mine.  The only problem I have had is with my iPhone.  For some reason it randomly stops updating an account so I have to remove and re-add the account.  Does not happen on my iPad though.