diff --git a/src/Gemstone.Web/APIController/ModelController.cs b/src/Gemstone.Web/APIController/ModelController.cs
index c1130a52..c4f2311c 100644
--- a/src/Gemstone.Web/APIController/ModelController.cs
+++ b/src/Gemstone.Web/APIController/ModelController.cs
@@ -23,7 +23,6 @@
 // ReSharper disable StaticMemberInGenericType
 
 using System;
-using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Gemstone.Data;
diff --git a/src/Gemstone.Web/Security/IAuthenticationWebBuilder.cs b/src/Gemstone.Web/Security/IAuthenticationWebBuilder.cs
index 1f52340c..9678072f 100644
--- a/src/Gemstone.Web/Security/IAuthenticationWebBuilder.cs
+++ b/src/Gemstone.Web/Security/IAuthenticationWebBuilder.cs
@@ -24,6 +24,7 @@
 using System;
 using System.IO;
 using System.Net;
+using System.Security.Claims;
 using System.Text;
 using System.Threading.Tasks;
 using Gemstone.Security.AuthenticationProviders;
@@ -171,7 +172,16 @@ private static async Task HandleLogoutRequestAsync(HttpContext httpContext)
             // If the sign out procedure did not trigger any errors or redirects,
             // this asks the cookie authentication scheme to redirect to the login page
             if (IsSuccess(httpContext.Response.StatusCode) && !IsAjaxRequest(httpContext.Request))
-                await httpContext.ChallengeAsync(new AuthenticationProperties() { RedirectUri = "/" });
+            {
+                string redirectUri = httpContext.Request.PathBase.HasValue
+                    ? $"{httpContext.Request.PathBase}/"
+                    : "/";
+
+                await httpContext.ChallengeAsync(new AuthenticationProperties()
+                {
+                    RedirectUri = redirectUri
+                });
+            }
         }
 
         private static async Task HandleAccessDeniedAsync(HttpContext httpContext)
@@ -256,6 +266,12 @@ public static AuthenticationBuilder ConfigureOAuthProvider(this AuthenticationBu
 
             foreach (string scope in providerOptions.Scopes.Split(' ', StringSplitOptions.RemoveEmptyEntries))
                 config.Scope.Add(scope);
+
+            config.Events.OnTokenValidated = context =>
+            {
+                AddProviderIdentityClaim(context.Principal, OAuthAuthenticationProviderExtensions.DefaultIdentity);
+                return Task.CompletedTask;
+            };
         });
     }
 
@@ -318,7 +334,30 @@ private static AuthenticationBuilder ConfigureGemstoneWebDefaults(this IServiceC
         return services
             .AddWindowsAuthenticationProvider()
             .AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
-            .AddNegotiate("windows", _ => { })
-            .AddCookie();
+            .AddNegotiate("windows", options =>
+            {
+                if (options.Events is not null)
+                {
+                    options.Events.OnAuthenticated = context =>
+                    {
+                        AddProviderIdentityClaim(context.Principal, WindowsAuthenticationProviderExtensions.DefaultIdentity);
+                        return Task.CompletedTask;
+                    };
+                }
+            }).AddCookie();
+    }
+
+    /// <summary>
+    /// Adds a claim to the principal indicating the identity of the provider that authenticated the user, if it does not already exist.
+    /// </summary>
+    /// <param name="principal">The claims principal</param>
+    /// <param name="providerIdentity">The identity of the authentication provider</param>
+    private static void AddProviderIdentityClaim(ClaimsPrincipal? principal, string providerIdentity)
+    {
+        if (principal?.Identity is not ClaimsIdentity identity)
+            return;
+
+        if (!identity.HasClaim("Gemstone.ProviderIdentity", providerIdentity))
+            identity.AddClaim(new Claim("Gemstone.ProviderIdentity", providerIdentity));
     }
 }
diff --git a/src/Gemstone.Web/WebExtensions.cs b/src/Gemstone.Web/WebExtensions.cs
index 16fa28c0..b42df9c7 100644
--- a/src/Gemstone.Web/WebExtensions.cs
+++ b/src/Gemstone.Web/WebExtensions.cs
@@ -33,7 +33,6 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Features;
 using Microsoft.Extensions.FileProviders;
-using Microsoft.Extensions.Primitives;
 
 namespace Gemstone.Web
 {