diff --git a/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthCalloutTests.Impltests.cs b/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthCalloutTests.Impltests.cs
index 8075dd3..043e32d 100644
--- a/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthCalloutTests.Impltests.cs
+++ b/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthCalloutTests.Impltests.cs
@@ -108,20 +108,10 @@ public sealed class AuthCalloutTests
         server.ShouldNotBeNull();
     }
 
-    [Fact] // T:117
+    [Fact(Skip = "DEFERRED: requires full operator-mode auth callout integration runtime")] // T:117
     public void AuthCalloutOperatorModeBasics_ShouldSucceed()
     {
-        var (server, err) = NatsServer.NewServer(new ServerOptions());
-        err.ShouldBeNull();
-
-        var opts = new ServerOptions
-        {
-            TrustedOperators = [new object()],
-            AuthCallout = new AuthCalloutOpts { Account = "AUTH", Issuer = "OP" },
-        };
-
-        Should.Throw<NotImplementedException>(() =>
-            server!.ProcessClientOrLeafAuthentication(CreateClient(1, "h", "u", "p"), opts));
+        // DEFERRED: requires end-to-end operator resolver + auth service runtime setup.
     }
 
     [Fact] // T:120
@@ -228,51 +218,22 @@ public sealed class AuthCalloutTests
         req.ConnectOptions!.Username.ShouldBe("leaf-user");
     }
 
-    [Fact] // T:138
+    [Fact(Skip = "DEFERRED: requires leafnode auth callout integration runtime")] // T:138
     public void AuthCalloutLeafNodeAndConfigMode_ShouldSucceed()
     {
-        var (server, err) = NatsServer.NewServer(new ServerOptions());
-        err.ShouldBeNull();
-
-        var opts = new ServerOptions
-        {
-            AuthCallout = new AuthCalloutOpts { Account = "AUTH" },
-        };
-
-        Should.Throw<NotImplementedException>(() =>
-            server!.ProcessClientOrLeafAuthentication(CreateClient(21, "leaf", kind: ClientKind.Leaf), opts));
+        // DEFERRED: requires multi-server leafnode handshake + callout service.
     }
 
-    [Fact] // T:140
+    [Fact(Skip = "DEFERRED: requires operator-mode credential mismatch integration runtime")] // T:140
     public void AuthCalloutOperatorModeMismatchedCalloutCreds_ShouldSucceed()
     {
-        var (server, err) = NatsServer.NewServer(new ServerOptions());
-        err.ShouldBeNull();
-
-        var opts = new ServerOptions
-        {
-            TrustedOperators = [new object()],
-            AuthCallout = new AuthCalloutOpts { Account = "AUTH", Issuer = "OP", AuthUsers = ["bad-user"] },
-        };
-
-        Should.Throw<NotImplementedException>(() =>
-            server!.ProcessClientOrLeafAuthentication(CreateClient(30, "h", "user", "pass"), opts));
+        // DEFERRED: requires connected external auth service with mismatched user creds.
     }
 
-    [Fact] // T:141
+    [Fact(Skip = "DEFERRED: requires leafnode+operator mismatched credentials integration runtime")] // T:141
     public void AuthCalloutLeafNodeOperatorModeMismatchedCreds_ShouldSucceed()
     {
-        var (server, err) = NatsServer.NewServer(new ServerOptions());
-        err.ShouldBeNull();
-
-        var opts = new ServerOptions
-        {
-            TrustedOperators = [new object()],
-            AuthCallout = new AuthCalloutOpts { Account = "AUTH", Issuer = "OP", AuthUsers = ["leaf-bad"] },
-        };
-
-        Should.Throw<NotImplementedException>(() =>
-            server!.ProcessClientOrLeafAuthentication(CreateClient(31, "leaf", "lu", "lp", kind: ClientKind.Leaf), opts));
+        // DEFERRED: requires multiple servers and live leafnode credential exchange.
     }
 
     private static ClientConnection CreateClient(
diff --git a/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthHandlerTests.Impltests.cs b/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthHandlerTests.Impltests.cs
index 1cf5f64..22372de 100644
--- a/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthHandlerTests.Impltests.cs
+++ b/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/AuthHandlerTests.Impltests.cs
@@ -16,6 +16,9 @@ public sealed class AuthHandlerTests
         };
 
         AuthHandler.ValidateNoAuthUser(opts, "alice").ShouldBeNull();
+        var missingUser = AuthHandler.ValidateNoAuthUser(opts, "bob");
+        missingUser.ShouldNotBeNull();
+        missingUser!.Message.ShouldContain("not present as user or nkey");
     }
 
     [Fact] // T:150
@@ -27,6 +30,7 @@ public sealed class AuthHandlerTests
         };
 
         AuthHandler.ValidateNoAuthUser(opts, "NKEY1").ShouldBeNull();
+        AuthHandler.ValidateNoAuthUser(opts, "NKEY2").ShouldNotBeNull();
     }
 
     [Fact] // T:152
diff --git a/porting.db b/porting.db
index cecddda..602c25c 100644
Binary files a/porting.db and b/porting.db differ
diff --git a/reports/current.md b/reports/current.md
index 1365a04..41a4875 100644
--- a/reports/current.md
+++ b/reports/current.md
@@ -1,6 +1,6 @@
 # NATS .NET Porting Status Report
 
-Generated: 2026-02-28 02:41:54 UTC
+Generated: 2026-02-28 09:39:14 UTC
 
 ## Modules (12 total)
 
@@ -21,9 +21,9 @@ Generated: 2026-02-28 02:41:54 UTC
 
 | Status | Count |
 |--------|-------|
-| deferred | 2640 |
+| deferred | 2555 |
 | n_a | 187 |
-| verified | 430 |
+| verified | 515 |
 
 ## Library Mappings (36 total)
 
@@ -34,4 +34,4 @@ Generated: 2026-02-28 02:41:54 UTC
 
 ## Overall Progress
 
-**1924/6942 items complete (27.7%)**
+**2009/6942 items complete (28.9%)**
diff --git a/reports/report_564b91d.md b/reports/report_564b91d.md
new file mode 100644
index 0000000..41a4875
--- /dev/null
+++ b/reports/report_564b91d.md
@@ -0,0 +1,37 @@
+# NATS .NET Porting Status Report
+
+Generated: 2026-02-28 09:39:14 UTC
+
+## Modules (12 total)
+
+| Status | Count |
+|--------|-------|
+| verified | 12 |
+
+## Features (3673 total)
+
+| Status | Count |
+|--------|-------|
+| deferred | 2377 |
+| n_a | 24 |
+| stub | 1 |
+| verified | 1271 |
+
+## Unit Tests (3257 total)
+
+| Status | Count |
+|--------|-------|
+| deferred | 2555 |
+| n_a | 187 |
+| verified | 515 |
+
+## Library Mappings (36 total)
+
+| Status | Count |
+|--------|-------|
+| mapped | 36 |
+
+
+## Overall Progress
+
+**2009/6942 items complete (28.9%)**