TFS 서버의 이벤트 로그 오류 - WebHost failed to process a request. Parameter name: certificate

TFS AppTier의 이벤트 로그에 다음과 같은 항목들이 대량으로 쌓여 있었습니다.

Log Name:      Application
Source:        System.ServiceModel 3.0.0.0
Date:          2013-04-08 오후 3:36:00
Event ID:      3
Task Category: WebHost
Level:         Error
Keywords:      Classic
User:          TESTAD\tfs2010admin
Computer:      ttfs2012.testad.com
Description:
WebHost failed to process a request.
 Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/17653682
 Exception: System.ServiceModel.ServiceActivationException: The service '/SecurityTokenServiceApplication/securitytoken.svc' cannot be activated due to an exception during compilation.  The exception message is: Exception has been thrown by the target of an invocation.. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentNullException: Value cannot be null.
Parameter name: certificate
   at System.IdentityModel.Tokens.X509SecurityToken..ctor(X509Certificate2 certificate, String id, Boolean clone, Boolean disposable)
   at System.IdentityModel.Tokens.X509SecurityToken..ctor(X509Certificate2 certificate)
   at Microsoft.IdentityModel.SecurityTokenService.X509SigningCredentials..ctor(X509Certificate2 certificate)
   at Microsoft.SharePoint.IdentityModel.SPSecurityTokenServiceConfiguration..ctor()
...[생략]...
   at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath)
   at System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String relativeVirtualPath)
 
Process Name: w3wp
Process ID: 5072

SharePoint 2010: Nailing the error "The Security Token Service is unavailable"
; http://blogs.technet.com/b/sykhad-msft/archive/2012/02/25/sharepoint-2010-nailing-the-error-quot-the-security-token-service-is-unavailable-quot.aspx

$h = Get-SPServiceHostconfig
$h.Provision()
$services = Get-SPServiceApplication
foreach ($service in $services) { $service.provision(); write-host $service.name}