Lync 2013 – Mobile Clients Unable to Sign In Following Update KBKB308035 (09/15)

We recently received a request from a customer with issues related to the Lync App Usage on an apple device, however from research it seems that this is spread to all mobile clients for Lync 2013.

It seems that the latest stream of updates for Lync Server 2013 introduces KB308035 that seems to cause a whole host of issues with the key error showing up in Event viewer on the front End as:

WebHost failed to process a request.

Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/58029198

Exception: System.ServiceModel.ServiceActivationException: The service ‘/WebTicket/WebTicketService.svc’ cannot be activated due to an exception during compilation.  The exception message is: Method not found: ‘Microsoft.Rtc.Management.Config.Settings.Web.MobilePreferredAuthType Microsoft.Rtc.Management.Config.Settings.Web.WebServiceSettings.get_MobilePreferredAuthType()’.. —> System.MissingMethodException: Method not found: ‘Microsoft.Rtc.Management.Config.Settings.Web.MobilePreferredAuthType Microsoft.Rtc.Management.Config.Settings.Web.WebServiceSettings.get_MobilePreferredAuthType()’.

   at Microsoft.Rtc.Internal.WebTicketService.WebTicketServiceHostFactory.CreateServiceHost(Type serviceType, Uri[] baseAddresses)

   at System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses)

   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.CreateService(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)

   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(ServiceActivationInfo serviceActivationInfo, EventTraceActivity eventTraceActivity)

   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)

   — End of inner exception stack trace —

   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)

   at System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String relativeVirtualPath, EventTraceActivity eventTraceActivity)

Process Name: w3wp

Process ID: 924

The simple fix for this issue is to go straight ahead and uninstall the KB308035 update and give the Front End Servers a quick reboot.

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