From cc03842f5fae3b5d1ee7a933b4020e5a82cc77dd Mon Sep 17 00:00:00 2001
From: Brant DeBow <125889545+brant-livefront@users.noreply.github.com>
Date: Wed, 31 Dec 2025 11:59:59 -0500
Subject: [PATCH] Disable database distributed cache in non-self-hosted
 environments (#6783)

* Disable database distributed cache in non-self-hosted environments

* Added distributed memory cache as a final fallback option
---
 .../Utilities/ServiceCollectionExtensions.cs  | 28 ++++++++++++-------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/SharedWeb/Utilities/ServiceCollectionExtensions.cs b/src/SharedWeb/Utilities/ServiceCollectionExtensions.cs
index 91047d98bc..8f5dfdf3f4 100644
--- a/src/SharedWeb/Utilities/ServiceCollectionExtensions.cs
+++ b/src/SharedWeb/Utilities/ServiceCollectionExtensions.cs
@@ -661,8 +661,9 @@ public static class ServiceCollectionExtensions
     }
 
     /// <summary>
-    ///     Adds an implementation of <see cref="IDistributedCache"/> to the service collection. Uses a memory
-    /// cache if self hosted or no Redis connection string is available in GlobalSettings.
+    ///     Adds an implementation of <see cref="IDistributedCache"/> to the service collection. Uses Redis
+    /// if a connection string is available in GlobalSettings, a database-backed distributed cache if
+    /// self-hosted or a distributed memory cache as a final fallback.
     /// </summary>
     public static void AddDistributedCache(
         this IServiceCollection services,
@@ -677,19 +678,26 @@ public static class ServiceCollectionExtensions
         }
         else
         {
-            var (databaseProvider, databaseConnectionString) = GetDatabaseProvider(globalSettings);
-            if (databaseProvider == SupportedDatabaseProviders.SqlServer)
+            if (globalSettings.SelfHosted)
             {
-                services.AddDistributedSqlServerCache(o =>
+                var (databaseProvider, databaseConnectionString) = GetDatabaseProvider(globalSettings);
+                if (databaseProvider == SupportedDatabaseProviders.SqlServer)
                 {
-                    o.ConnectionString = databaseConnectionString;
-                    o.SchemaName = "dbo";
-                    o.TableName = "Cache";
-                });
+                    services.AddDistributedSqlServerCache(o =>
+                    {
+                        o.ConnectionString = databaseConnectionString;
+                        o.SchemaName = "dbo";
+                        o.TableName = "Cache";
+                    });
+                }
+                else
+                {
+                    services.AddSingleton<IDistributedCache, EntityFrameworkCache>();
+                }
             }
             else
             {
-                services.AddSingleton<IDistributedCache, EntityFrameworkCache>();
+                services.AddDistributedMemoryCache();
             }
         }