diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Historian/ServerHistorianOptions.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Historian/ServerHistorianOptions.cs
index c63cb16a..254dd24a 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Historian/ServerHistorianOptions.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Historian/ServerHistorianOptions.cs
@@ -30,7 +30,7 @@ public sealed class ServerHistorianOptions
     public string Host { get; init; } = "localhost";
 
     /// <summary>TCP port the Wonderware historian sidecar listens on.</summary>
-    public int Port { get; init; }
+    public int Port { get; init; } = 32569;
 
     /// <summary>When <c>true</c>, the client connects over TLS.</summary>
     public bool UseTls { get; init; }
@@ -44,12 +44,14 @@ public sealed class ServerHistorianOptions
     /// <summary>Returns operator-facing misconfiguration warnings for an <c>Enabled</c> historian
     /// (empty when disabled or correctly configured). Pure — the registration logs each entry.</summary>
     /// <returns>Zero or more human-readable warning messages.</returns>
-    public IEnumerable<string> Validate()
+    public IReadOnlyList<string> Validate()
     {
-        if (!Enabled) yield break;
+        var warnings = new List<string>();
+        if (!Enabled) return warnings;
         if (string.IsNullOrWhiteSpace(SharedSecret))
-            yield return "ServerHistorian:SharedSecret is empty while the historian is enabled — the Wonderware sidecar Hello frame will carry an empty secret.";
+            warnings.Add("ServerHistorian:SharedSecret is empty while the historian is enabled — the Wonderware sidecar Hello frame will carry an empty secret.");
         if (Port <= 0)
-            yield return $"ServerHistorian:Port is {Port} — must be > 0; the read client cannot dial the sidecar.";
+            warnings.Add($"ServerHistorian:Port is {Port} — must be > 0; the read client cannot dial the sidecar.");
+        return warnings;
     }
 }
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ServiceCollectionExtensions.cs b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ServiceCollectionExtensions.cs
index e31a023a..c6aa75c6 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ServiceCollectionExtensions.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ServiceCollectionExtensions.cs
@@ -119,7 +119,7 @@ public static class ServiceCollectionExtensions
         if (opts is not { Enabled: true }) return services; // leave the Null default from AddOtOpcUaRuntime
 
         foreach (var warning in opts.Validate())
-            Serilog.Log.Logger.ForContext<ServerHistorianOptions>().Warning("ServerHistorian config: {ServerHistorianConfigWarning}", warning);
+            Serilog.Log.Logger.ForContext<IHistorianDataSource>().Warning("ServerHistorian config: {ServerHistorianConfigWarning}", warning);
 
         // Last-registration-wins over the TryAddSingleton Null default seeded by AddOtOpcUaRuntime.
         services.AddSingleton<IHistorianDataSource>(sp => dataSourceFactory(opts, sp));