Continuous request for the CalDav password

Thanks Linc but I'll need some further details.

* First, the calendar account should be set up as a generic CalDAV account, not as an OS X Server account.

It is set up this way already. Maybe my original post wasn't clear or perhaps I am not understanding what you're saying here so I'll reiterate. Please follow up with more details if I am misinterpreting. The OS X Server account exists on my MacMini and not the MacBook Pro. On the MacBook Pro the account is set up as a generic CalDAV account.

* If it is, delete the password item from your keychain in the Keychain Access application. The next time you're prompted for the password, check the box to store it in the keychain.

I didn't mention this in my original post, sorry about that, but I did try this at least twice when I couldn't stop it by deleting the account through the preferences.

Sure, happy to provide them as soon as I get back. Which ones should I be looking at and how do I go about retrieving them?

ETA: I know most are in /var/log but I am not sure which logs you'd be after, syslog, auth?

On the client side I am getting this each time I am prompted:

4/23/16 5:30:37.228 PM CalendarAgent[502]: [com.apple.calendar.store.log.caldav.mismatch] [Sync report for calendar home 192.168.XXX.XXX, failed with error Error Domain=CoreDAVHTTPStatusErrorDomain Code=401 "(null)" UserInfo={CoreDAVHTTPHeaders=<CFBasicHash 0x7fe63d9bfef0 [0x7fff79412440]>{type = immutable dict, count = 8,

entries =>

0 : Server = <CFString 0x7fe63db0f280 [0x7fff79412440]>{contents = "Twisted/15.4.0 TwistedWeb/9.0.0"}

1 : Content-Type = <CFString 0x7fff79378e60 [0x7fff79412440]>{contents = "text/html;charset=utf-8"}

3 : Strict-Transport-Security = <CFString 0x7fe63db2fdb0 [0x7fff79412440]>{contents = "max-age=604800"}

6 : Date = <CFString 0x7fe63a2d5110 [0x7fff79412440]>{contents = "Sat, 23 Apr 2016 21:30:37 GMT"}

9 : Www-Authenticate = <CFString 0x7fe63a2f0700 [0x7fff79412440]>{contents = "digest algorithm="md5", opaque="06e8cf4616b72af1affd111be79a9fb0-MDJkYmUwODRmNWZkZmIyOTc4ZjkyMGM1LDAuMC 4wLjAsMTQ2MTQ0NzAzNw==", realm="xxxxxx-mac-mini.local", nonce="02dbe084f5fdfb2978f920c5", basic realm="xxxx-mac-mini.local""}

10 : Content-Length = 141

11 : Keep-Alive = <CFString 0x7fe63a2bb3a0 [0x7fff79412440]>{contents = "timeout=5, max=99"}

12 : Connection = <CFString 0x7fff793b5940 [0x7fff79412440]>{contents = "Keep-Alive"}

}

}]

I am still trying to sort out what's going on on the server side.

Nope, nothing yet. I was hoping for a reply based on the logs I posted. But I am still trying to find a solution.