diff --git a/dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.JetStreamEvents.cs b/dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.JetStreamEvents.cs
new file mode 100644
index 0000000..7b7f10b
--- /dev/null
+++ b/dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.JetStreamEvents.cs
@@ -0,0 +1,86 @@
+// Copyright 2020-2026 The NATS Authors
+// Licensed under the Apache License, Version 2.0
+
+using System.Text.Json;
+
+namespace ZB.MOM.NatsNet.Server;
+
+public sealed partial class NatsServer
+{
+    internal bool PublishAdvisory(Account? acc, string subject, object advisory) =>
+        PublishAdvisory(acc, subject, advisory, SendInternalAccountMsg);
+
+    internal bool PublishAdvisory(
+        Account? acc,
+        string subject,
+        object advisory,
+        Func<Account, string, byte[], Exception?> sendInternalAccountMessage,
+        Func<Account, string, bool>? hasGatewayInterest = null)
+    {
+        ArgumentNullException.ThrowIfNull(sendInternalAccountMessage);
+
+        var account = acc ?? SystemAccount();
+        if (account is null)
+        {
+            return false;
+        }
+
+        var sublist = account.Sublist;
+        var gatewayInterestCheck = hasGatewayInterest ?? HasGatewayInterest;
+        var hasLocalInterest = sublist != null && sublist.HasInterest(subject);
+        if (!hasLocalInterest && !gatewayInterestCheck(account, subject))
+        {
+            return false;
+        }
+
+        byte[] payload;
+        try
+        {
+            payload = JsonSerializer.SerializeToUtf8Bytes(advisory);
+        }
+        catch (Exception ex)
+        {
+            Warnf("Advisory could not be serialized for account {0}: {1}", account.Name, ex);
+            return false;
+        }
+
+        Exception? err;
+        try
+        {
+            err = sendInternalAccountMessage(account, subject, payload);
+        }
+        catch (Exception ex)
+        {
+            err = ex;
+        }
+
+        if (err != null)
+        {
+            Warnf("Advisory could not be sent for account {0}: {1}", account.Name, err);
+            return false;
+        }
+
+        return true;
+    }
+
+    internal Exception? SendInternalAccountMsg(Account account, string subject, byte[] message)
+    {
+        try
+        {
+            var sendQueue = account.GetSendQueue() ?? NewSendQueue(account);
+            SendQueue.Send(sendQueue, subject, string.Empty, [], message);
+            return null;
+        }
+        catch (Exception ex)
+        {
+            return ex;
+        }
+    }
+
+    internal bool HasGatewayInterest(Account account, string subject)
+    {
+        _ = account;
+        _ = subject;
+        return false;
+    }
+}
diff --git a/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/NatsServerJetStreamEventsTests.cs b/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/NatsServerJetStreamEventsTests.cs
new file mode 100644
index 0000000..68294cc
--- /dev/null
+++ b/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/NatsServerJetStreamEventsTests.cs
@@ -0,0 +1,146 @@
+using System.Text;
+using Shouldly;
+using ZB.MOM.NatsNet.Server.Internal;
+using ZB.MOM.NatsNet.Server.Internal.DataStructures;
+
+namespace ZB.MOM.NatsNet.Server.Tests;
+
+public sealed class NatsServerJetStreamEventsTests
+{
+    [Fact]
+    public void PublishAdvisory_NullAccount_UsesSystemAccount()
+    {
+        var server = NewServer(new ServerOptions());
+        server.SetDefaultSystemAccount().ShouldBeNull();
+        var systemAccount = server.SystemAccount();
+        systemAccount.ShouldNotBeNull();
+
+        const string subject = "$JS.EVENT.ADVISORY.API";
+        AddInterest(systemAccount!, subject);
+
+        Account? capturedAccount = null;
+
+        var result = server.PublishAdvisory(
+            acc: null,
+            subject,
+            new { Event = "ok" },
+            sendInternalAccountMessage: (account, _, _) =>
+            {
+                capturedAccount = account;
+                return null;
+            });
+
+        result.ShouldBeTrue();
+        capturedAccount.ShouldBe(systemAccount);
+    }
+
+    [Fact]
+    public void PublishAdvisory_NoInterest_ReturnsFalseWithoutSend()
+    {
+        var server = NewServer(new ServerOptions { NoSystemAccount = true });
+        var account = new Account { Name = "A" };
+        var sendCalls = 0;
+
+        var result = server.PublishAdvisory(
+            account,
+            "$JS.EVENT.ADVISORY.API",
+            new { Event = "no-interest" },
+            sendInternalAccountMessage: (_, _, _) =>
+            {
+                sendCalls++;
+                return null;
+            },
+            hasGatewayInterest: (_, _) => false);
+
+        result.ShouldBeFalse();
+        sendCalls.ShouldBe(0);
+    }
+
+    [Fact]
+    public void PublishAdvisory_MarshalFailure_ReturnsFalse()
+    {
+        var server = NewServer(new ServerOptions { NoSystemAccount = true });
+        var account = new Account { Name = "A" };
+        AddInterest(account, "$JS.EVENT.ADVISORY.API");
+
+        var sendCalls = 0;
+        var advisory = new CyclicAdvisory();
+        advisory.Self = advisory;
+
+        var result = server.PublishAdvisory(
+            account,
+            "$JS.EVENT.ADVISORY.API",
+            advisory,
+            sendInternalAccountMessage: (_, _, _) =>
+            {
+                sendCalls++;
+                return null;
+            });
+
+        result.ShouldBeFalse();
+        sendCalls.ShouldBe(0);
+    }
+
+    [Fact]
+    public void PublishAdvisory_SendFailure_ReturnsFalse()
+    {
+        var server = NewServer(new ServerOptions { NoSystemAccount = true });
+        var account = new Account { Name = "A" };
+        AddInterest(account, "$JS.EVENT.ADVISORY.API");
+
+        var result = server.PublishAdvisory(
+            account,
+            "$JS.EVENT.ADVISORY.API",
+            new { Event = "send-error" },
+            sendInternalAccountMessage: (_, _, _) => new InvalidOperationException("send failed"));
+
+        result.ShouldBeFalse();
+    }
+
+    [Fact]
+    public void PublishAdvisory_SendSucceeds_ReturnsTrue()
+    {
+        var server = NewServer(new ServerOptions { NoSystemAccount = true });
+        var account = new Account { Name = "A" };
+        AddInterest(account, "$JS.EVENT.ADVISORY.API");
+
+        byte[]? payload = null;
+
+        var result = server.PublishAdvisory(
+            account,
+            "$JS.EVENT.ADVISORY.API",
+            new { Event = "sent" },
+            sendInternalAccountMessage: (_, _, bytes) =>
+            {
+                payload = bytes;
+                return null;
+            });
+
+        result.ShouldBeTrue();
+        payload.ShouldNotBeNull();
+        Encoding.UTF8.GetString(payload!).ShouldContain("\"Event\":\"sent\"");
+    }
+
+    private static NatsServer NewServer(ServerOptions options)
+    {
+        var (server, err) = NatsServer.NewServer(options);
+        err.ShouldBeNull();
+        server.ShouldNotBeNull();
+        return server!;
+    }
+
+    private static void AddInterest(Account account, string subject)
+    {
+        account.Sublist ??= SubscriptionIndex.NewSublistWithCache();
+        var err = account.Sublist.Insert(new Subscription
+        {
+            Subject = Encoding.ASCII.GetBytes(subject),
+        });
+        err.ShouldBeNull();
+    }
+
+    private sealed class CyclicAdvisory
+    {
+        public CyclicAdvisory? Self { get; set; }
+    }
+}
diff --git a/porting.db b/porting.db
index bca7a4b..e798f92 100644
Binary files a/porting.db and b/porting.db differ
diff --git a/reports/current.md b/reports/current.md
index ca710ca..421bc0b 100644
--- a/reports/current.md
+++ b/reports/current.md
@@ -1,6 +1,6 @@
 # NATS .NET Porting Status Report
 
-Generated: 2026-02-28 17:44:45 UTC
+Generated: 2026-02-28 17:51:02 UTC
 
 ## Modules (12 total)
 
@@ -13,10 +13,10 @@ Generated: 2026-02-28 17:44:45 UTC
 | Status | Count |
 |--------|-------|
 | complete | 14 |
-| deferred | 1969 |
+| deferred | 1968 |
 | n_a | 24 |
 | stub | 1 |
-| verified | 1665 |
+| verified | 1666 |
 
 ## Unit Tests (3257 total)
 
@@ -35,4 +35,4 @@ Generated: 2026-02-28 17:44:45 UTC
 
 ## Overall Progress
 
-**3016/6942 items complete (43.4%)**
+**3017/6942 items complete (43.5%)**