Any news on this? I've had similar problem since two updates ago. Not sure if it was because of jolla update or update of our front end server. After that I've had the same "Credentials check FAILED! error == 5"
From frontend server logs I can find the OPTIONS query but I couldnt find it from the actual server.
With advanced rest client and curl on jolla phone I can make at least succesfull OPTIONS query to the server.
curl -u user:pass -X OPTIONS https://server.uri/Microsoft-Server-ActiveSync -k -i
It responses with:
Cache-Control: private
Allow: OPTIONS,POST
Content-Length: 0
Server: Microsoft-IIS/8.5
Ms-Server-Activesync: 14.3
Ms-Asprotocolversions: 2.0,2.1,2.5,12.0,12.1,14.0,14.1
Ms-Asprotocolcommands: Sync,SendMail,SmartForward,SmartReply,GetAttachment,GetHierarchy,CreateCollection,DeleteCollection,MoveCollection,FolderSync,FolderCreate,FolderDelete,FolderUpdate,MoveItems,GetItemEstimate,MeetingResponse,Search,Settings,Ping,ItemOperations,Provision,ResolveRecipients,ValidateCert
Public: OPTIONS,POST
X-Aspnet-Version: 2.0.50727
X-Powered-By: ASP.NET; ARR/3.0
Date: Fri, 19 Aug 2016 12:15:53 GMT
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