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Two of the certificates for my servers expired today and everything went down hill after that. I had this same issue last year, however the person that fixed it for me wasn't even sure what he had done that solved the issue. I saved the link of the steps that he followed, however there is a completely different article on that page.

My main issue stems from the fact that I don't know how the trust is established among the servers. I don't know which server should generate the trust certificate or even if there is a special way to generate it. I tried to do it on my own however I am still getting a Server 500 error and a tons of errors in the event logs for both servers. Below is the error I am getting for Event ID 3:

WebHost failed to process a request. Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/12036987 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 Microsoft.SharePoint.Administration.Claims.SPSecurityTokenServiceManager.ConfigureTokenHandlerCollection(SPSecurityTokenServiceManager manager, SecurityTokenHandlerCollectionManager collectionManager, String key, SecurityTokenHandlerCollection& tokenHandlerCollection)
at Microsoft.SharePoint.IdentityModel.SPSecurityTokenServiceConfiguration.ConfigureTokenHandlerCollectionForLocalIssuer(SPSecurityTokenServiceManager manager, SecurityTokenHandlerCollectionManager collectionManager, String key) at Microsoft.SharePoint.IdentityModel.SPSecurityTokenServiceConfiguration..ctor() --- End of inner exception stack trace --- at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) at Microsoft.IdentityModel.Protocols.WSTrust.WSTrustServiceHostFactory.CreateSecurityTokenServiceConfiguration(String constructorString) at Microsoft.IdentityModel.Protocols.WSTrust.WSTrustServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) at Microsoft.SharePoint.IdentityModel.SPSecurityTokenServiceHostFactory.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: 8008

The part that jumped out at me is where it said that the certificate is null. How do I set that? Can someone point me in the article that tells me how to set this up?

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I figured it out and I am posting this just in case anyone else has the same issue. I had to run the below in PowerShell (please note that this is done after you create the certificate):

$pfxPath = "<path to replacement certificate (.pfx file)>"
$pfxPass = "<certificate password>"
$stsCertificate = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2 $pfxPath, $pfxPass, 20
Set-SPSecurityTokenServiceConfig -ImportSigningCertificate $stsCertificate
certutil -addstore -enterprise -f -v root $stsCertificate
iisreset
net stop SPTimerV4
net start SPTimerV4

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