Installing KB 3080353 on Lync Server 2013 causes users to not be able to log in with Lync Mobility clients

Problem

You’ve recently installed Lync Server 2013 updates, and more specifically the Lync Server 2013, Web Components Server (KB3080353) onto your Lync Server then immediately noticed that users with iPhones or Androids are no longer able to log in with their Lync clients via the Lync Mobility service.

You’ve confirmed that login traffic from Lync Mobility clients are indeed hitting the IIS server when you review the IIS logs:

2015-10-22 12:23:44 10.21.1.106 GET / sipuri=sip:a-tluk@contoso.com 4443 - 216.249.42.188 ACOMO - 200 0 0 78

2015-10-22 12:23:44 10.21.1.106 GET /Autodiscover/AutodiscoverService.svc/root/user originalDomain=contoso.com 4443 - 216.249.42.188 ACOMO - 401 0 0 0

2015-10-22 12:23:44 10.21.1.106 GET /Autodiscover/AutodiscoverService.svc/root/user originalDomain=contoso.com 4443 - 216.249.42.188 ACOMO - 401 0 0 15

2015-10-22 12:23:44 10.21.1.106 GET /Autodiscover/AutodiscoverService.svc/root/user originalDomain=contoso.com 4443 - 216.249.42.188 ACOMO - 401 0 0 15

2015-10-22 12:23:44 10.21.1.106 POST /WebTicket/WebTicketService.svc/mex - 4443 - 216.249.42.188 ACOMO - 500 0 0 93

2015-10-22 12:23:44 10.21.1.106 GET / sipuri=sip:a-tluk@contoso.com 4443 - 216.249.42.188 ACOMO - 200 0 0 15

2015-10-22 12:23:44 10.21.1.106 POST /WebTicket/WebTicketService.svc/mex - 4443 - 216.249.42.188 ACOMO - 500 0 0 15

Reviewing the Application logs show the following event consistently logged:

Log Name: Application

Source: System.ServiceModel 4.0.0.0

Event ID: 3

Level: Error

User: NETWORK SERVICE

WebHost failed to process a request.

Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/35236192

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: 2768

Solution

I’ve noticed that this known issue from installing KB 3080353 is commonly overlooked as described in the following Microsoft article:

https://support.microsoft.com/en-us/kb/3080353#/en-us/kb/3080353

Clicking on the link to KB 3098577:

https://support.microsoft.com/en-us/kb/3098577#/en-us/kb/3098577

… will bring you to a KB that suggests either to uninstall KB 3080353 to bring the service up or uninstall KB 3080353, reinstall the July 2015 Lync Server 2013 cumulative updates, then reinstall KB 3080353.  The latter would be the better route to take as it ensures all the security patches are installed.

Before I uninstall KB 3080353, I’d like to paste the version of the Lync components on the server experiencing this problem just as a reference:

Proceed with locating KB 3080353 and uninstall the update:

You’ll notice that Lync Mobility works again after executing iisreset immediately after the uninstall of the patch:

Proceed to download the July 2013 Cumulative updates (KB 2809243) here:

http://www.microsoft.com/en-us/download/details.aspx?id=36820

Then download KB 3080353 here:

http://www.microsoft.com/en-us/download/details.aspx?id=48875

Reinstall the patch:

Lync Mobility should now work properly.  The following is a screenshot of the Lync Server 2013 component versions after performing the operations above: