Tag: Exchange 2013

Exchange 2013 Calendar Events In OpenHAB (CalDAV)

We’ve wanted to get our Exchange calendar events into OpenHAB — instead of trying to create a rule to determine preschool is in session, the repeating calendar event will dictate if it is a break or school day. Move the gymnastics session to a new day, and the audio reminder moves itself. Problem is, Microsoft stopped supporting CalDAV.

Scott found DAVMail — essentially a proxy that can translate between CalDAV clients and the EWS WSDL. Installation was straight-forward (click ‘next’ a few times). Configuration — for Exchange 2013, you need to select the “EWS” Exchange protocol and use your server’s EWS WSDL URL. https://yourhost.domain.cTLD/ews/exchange.asmx … then enable a local CalDAV port.

On the ‘network’ tab, check the box to allow remote connections. You *can* put the thumbprint of the IIS web site server certificate for your Exchange server into the “server certificate hash” field or you can leave it blank. On the first connection through DAVMail, there will be a pop-up asking you to verify and accept the certificate.

On the ‘encryption’ tab, you can configure a private keystore to allow the client to communicate over SSL. I used a PKCS12 store (Windows type), but a java keystore should work too (you may need to add the key signing key {a.k.a. CA public key} to the ca truststore for your java instance).

On the advanced tab, I did not enable Kerberos because the OpenHAB CalDAV binding passes credentials. I did enable KeepAlive – not sure if it is used, the CalDAV binding seems to poll. Save changes and open up the DAVMail log viewer to verify traffic is coming through.

Then comes Scott’s part — enable the bindings in OpenHAB (there are two of them – a CalDAVIO and CalDAVCmd). In the caldavio.cfg, the config lines need to be prefixed with ‘caldavio’ even though that’s not how it works in OpenHAB2.


Then in the caldavCommand.cfg file, you just need to tell it to load that calendar identifier:


We have needed stop openhab, delete the config file from ./config/org/openhab/ related to this calendar and binding before config changes are ingested.

Last step is making a calendar item that can do stuff. In the big text box that’s where a message body is located (no idea what that’s called on a calendar entry):


The subject can be whatever you want. The start time and end time are the times for the begin and end events. Voila!

Really Wacky Exchange (ActiveSync) Error

My husband changed his Active Directory password. Routine enough – we’ve got 15k accounts at the office and require a password change every 90 days. That’s 150-200 people changing their password every day. They get themselves locked out a lot (mobile devices, cached workstation credentials, and a host of other unique places people manage to store their creds), but it’s trivial to unlock an individual user.

*Except* — after the account was unlocked, his Windows 10 mail client updated properly and was interacting with the Exchange server. Android, however, still wouldn’t accept his new password. If he typed the wrong thing, it would say invalid password. But whenever he typed the right thing, he got an error indicating the phone and tablet were unable to communicate with the server. Which was bogus — I could see the communication coming across the reverse proxy server. With 200 codes — although you can have a very successful HTTP call deliver an application error message. But it wasn’t like he couldn’t COMMUNICATE with the server. He turned sync off on the phones to avoid getting locked out again, and in the process of troubleshooting ended up deleting all of his accounts hosted on our Exchange 2013 server.

I looked through all of the event logs, Exchange logs … nothing interesting. In desperation, I enabled the individual user ActiveSync logging:

Set-CASMailbox mailNickName -ActiveSyncDebugLogging:$true

Had him attempt to add the mailbox profile again, and dropped the log myself:

Get-ActiveSyncDeviceStatistics -Mailbox mailNickName -GetMailboxLog:$true -NotificationEmailAddress mysmtp@mydomain.ccTLD

Bingo! An exception in the provisioning (Microsoft-Server-ActiveSync?Cmd=Provision) call — I see the phone information come across, the mobile device gets partially added to his account (no OS, phone number, carrier type information … but if you go into OWA and remove the mobile device, an Android device gets added). Error:

Command_WorkerThread_Exception :
— Exception start —
Exception type: System.IO.FileLoadException
Exception message: Could not load file or assembly ‘Microsoft.Exchange.Configuration.ObjectModel, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
Exception level: 0
Exception stack trace: at Microsoft.Exchange.AirSync.DeviceInformationSetting.ProcessSet(XmlNode setNode)
at Microsoft.Exchange.AirSync.DeviceInformationSetting.Execute()
at Microsoft.Exchange.AirSync.ProvisionCommand.Microsoft.Exchange.AirSync.IProvisionCommandHost.ProcessDeviceInformationSettings(XmlNode inboundDeviceInformationNode, XmlNode provisionResponseNode)
at Microsoft.Exchange.AirSync.ProvisionCommandPhaseOne.Process(XmlNode provisionResponseNode)
at Microsoft.Exchange.AirSync.ProvisionCommand.ExecuteCommand()
at Microsoft.Exchange.AirSync.Command.WorkerThread()
Inner exception follows…
Exception type: System.IO.FileLoadException
Exception message: The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
Exception level: 1
Exception stack trace:
— Exception end —

Now that is an error I’ve never seen before. As a programmer, I know what it means … you’ve basically got some components that don’t match another. But … huh? He changed his password. Connected to the Exchange server directly (instead of remotely viewing logs & files) and saw Windows Update had dropped files and a reboot was pending. Which … some files replaced, others staged for replacement pending a reboot. *That* is some components not matching others. Rebooted our box, and voila … registration goes through, mailbox sync started.

I don’t know how many people allow auto-updates with a manual reboot on a production enterprise server (we manually patch and reboot during a scheduled maintenance window) where this could happen … but evidently Windows Update can get your Exchange server into a state where already configured clients are able to send and receive mail. But clients are unable to update passwords, and new clients cannot be configured.