SpnEndpointIdentity Class
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SpnEndpointIdentity Class


Represents a service principal name (SPN) for an identity when the binding uses Kerberos.

Namespace:   System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)


public class SpnEndpointIdentity : EndpointIdentity


Initializes a new instance of SpnEndpointIdentity with the specified identity claim.


Initializes a new instance of SpnEndpointIdentity with the specified service principal name (SPN).


Gets the identity claim that corresponds to the identity. (Inherited from EndpointIdentity.)


Specifies the maximum time allowed to look up the service principal name (SPN).


Returns a value that determines whether a specified object is equal to the current identity object or if they have equal security properties.(Inherited from EndpointIdentity.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Provides a hash code for the current instance of the identity.(Inherited from EndpointIdentity.)


Gets the Type of the current instance.(Inherited from Object.)


Initializes an EndpointIdentity with the specified claim.(Inherited from EndpointIdentity.)

System_CAPS_protmethodInitialize(Claim, IEqualityComparer<Claim>)

Initializes an EndpointIdentity with the specified claim and an interface and compares equality.(Inherited from EndpointIdentity.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns the identity.(Inherited from EndpointIdentity.)

An SPN is the name by which a client uniquely identifies an instance of a service. If you install multiple instances of a service on computers throughout a forest, each instance must have its own SPN. A given service instance can have multiple SPNs if there are multiple names that clients might use for authentication.

When a client wants to connect to a service, it locates an instance of the service, composes an SPN for that instance, and sets the identity to a SpnEndpointIdentity. A check will be made that the message is intended for that service.

The three authentication modes used under Kerberos are:

  • SSPINegotiate

  • Kerberos

  • KerberosOverTransport.

The following code shows one common way to create an instance of this class.

static EndpointIdentity CreateIdentity()
     WindowsIdentity self = WindowsIdentity.GetCurrent();
     SecurityIdentifier sid = self.User;

     EndpointIdentity identity = null;

     if (sid.IsWellKnown(WellKnownSidType.LocalSystemSid) ||
         sid.IsWellKnown(WellKnownSidType.NetworkServiceSid) ||
         identity = EndpointIdentity.CreateSpnIdentity(
             String.Format(CultureInfo.InvariantCulture, "host/{0}", GetMachineName()));
         // Need an UPN string here
         string domain = GetPrimaryDomain();
         if (domain != null)
             string[] split = self.Name.Split('\\');
             if (split.Length == 2)
                 identity = EndpointIdentity.CreateUpnIdentity(split[1] + "@" + domain);

     return identity;

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.0
Portable Class Library
Supported in: portable .NET platforms

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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