diff --git a/src/Tgstation.Server.Host/Components/Engine/EngineExecutableLock.cs b/src/Tgstation.Server.Host/Components/Engine/EngineExecutableLock.cs
index 02d9bfe493..36944a876f 100644
--- a/src/Tgstation.Server.Host/Components/Engine/EngineExecutableLock.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/EngineExecutableLock.cs
@@ -1,9 +1,13 @@
 using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
 
+using Microsoft.Extensions.Logging;
+
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Api.Models.Internal;
 using Tgstation.Server.Host.Components.Deployment;
+using Tgstation.Server.Host.System;
 using Tgstation.Server.Host.Utils;
 
 #nullable disable
@@ -11,7 +15,7 @@ using Tgstation.Server.Host.Utils;
 namespace Tgstation.Server.Host.Components.Engine
 {
 	/// <inheritdoc cref="IEngineExecutableLock" />
-	sealed class EngineExecutableLock : ReferenceCounter<IEngineInstallation>, IEngineExecutableLock
+	class EngineExecutableLock : ReferenceCounter<IEngineInstallation>, IEngineExecutableLock
 	{
 		/// <inheritdoc />
 		public EngineVersion Version => Instance.Version;
@@ -51,5 +55,14 @@ namespace Tgstation.Server.Host.Components.Engine
 
 		/// <inheritdoc />
 		public string FormatCompilerArguments(string dmePath) => Instance.FormatCompilerArguments(dmePath);
+
+		/// <inheritdoc />
+		public ValueTask StopServerProcess(ILogger logger, IProcess process, string accessIdentifier, ushort port, CancellationToken cancellationToken)
+			=> Instance.StopServerProcess(
+				logger,
+				process,
+				accessIdentifier,
+				port,
+				cancellationToken);
 	}
 }
diff --git a/src/Tgstation.Server.Host/Components/Engine/EngineInstallationBase.cs b/src/Tgstation.Server.Host/Components/Engine/EngineInstallationBase.cs
index 2133bdade4..f2da09f345 100644
--- a/src/Tgstation.Server.Host/Components/Engine/EngineInstallationBase.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/EngineInstallationBase.cs
@@ -1,12 +1,16 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Web;
 
+using Microsoft.Extensions.Logging;
+
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Api.Models.Internal;
 using Tgstation.Server.Host.Components.Deployment;
+using Tgstation.Server.Host.System;
 
 #nullable disable
 
@@ -58,6 +62,18 @@ namespace Tgstation.Server.Host.Components.Engine
 		public abstract string FormatCompilerArguments(string dmePath);
 
 		/// <inheritdoc />
-		public abstract string FormatServerArguments(IDmbProvider dmbProvider, IReadOnlyDictionary<string, string> parameters, DreamDaemonLaunchParameters launchParameters, string logFilePath);
+		public abstract string FormatServerArguments(
+			IDmbProvider dmbProvider,
+			IReadOnlyDictionary<string, string> parameters,
+			DreamDaemonLaunchParameters launchParameters,
+			string logFilePath);
+
+		/// <inheritdoc />
+		public virtual async ValueTask StopServerProcess(ILogger logger, IProcess process, string accessIdentifier, ushort port, CancellationToken cancellationToken)
+		{
+			logger.LogTrace("Terminating engine server process...");
+			process.Terminate();
+			await process.Lifetime;
+		}
 	}
 }
diff --git a/src/Tgstation.Server.Host/Components/Engine/IEngineInstallation.cs b/src/Tgstation.Server.Host/Components/Engine/IEngineInstallation.cs
index 861d6ebe90..bd7fa9e180 100644
--- a/src/Tgstation.Server.Host/Components/Engine/IEngineInstallation.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/IEngineInstallation.cs
@@ -1,9 +1,13 @@
 using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
 
+using Microsoft.Extensions.Logging;
+
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Api.Models.Internal;
 using Tgstation.Server.Host.Components.Deployment;
+using Tgstation.Server.Host.System;
 
 #nullable disable
 
@@ -53,7 +57,7 @@ namespace Tgstation.Server.Host.Components.Engine
 		/// Return the command line arguments for launching with given <paramref name="launchParameters"/>.
 		/// </summary>
 		/// <param name="dmbProvider">The <see cref="IDmbProvider"/>.</param>
-		/// <param name="parameters">The map of parameter <see cref="string"/>s as a <see cref="IReadOnlyDictionary{TKey, TValue}"/>. Should NOT include the <see cref="DreamDaemonLaunchParameters.AdditionalParameters"/> of <paramref name="launchParameters"/>.</param>
+		/// <param name="parameters">The map of parameter <see cref="string"/>s as a <see cref="IReadOnlyDictionary{TKey, TValue}"/>. MUST include <see cref="Interop.DMApiConstants.ParamAccessIdentifier"/>. Should NOT include the <see cref="DreamDaemonLaunchParameters.AdditionalParameters"/> of <paramref name="launchParameters"/>.</param>
 		/// <param name="launchParameters">The <see cref="DreamDaemonLaunchParameters"/>.</param>
 		/// <param name="logFilePath">The full path to the log file, if any.</param>
 		/// <returns>The formatted arguments <see cref="string"/>.</returns>
@@ -69,5 +73,16 @@ namespace Tgstation.Server.Host.Components.Engine
 		/// <param name="dmePath">The full path to the .dme to compile.</param>
 		/// <returns>The formatted arguments <see cref="string"/>.</returns>
 		string FormatCompilerArguments(string dmePath);
+
+		/// <summary>
+		/// Kills a given engine server <paramref name="process"/>.
+		/// </summary>
+		/// <param name="logger">The <see cref="ILogger"/> to write to.</param>
+		/// <param name="process">The <see cref="IProcess"/> to be terminated.</param>
+		/// <param name="accessIdentifier">The <see cref="Interop.DMApiParameters.AccessIdentifier"/> of the session.</param>
+		/// <param name="port">The port the server is running on.</param>
+		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
+		/// <returns>A <see cref="ValueTask"/> representing the running operation.</returns>
+		ValueTask StopServerProcess(ILogger logger, IProcess process, string accessIdentifier, ushort port, CancellationToken cancellationToken);
 	}
 }
diff --git a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs
index db3e7a7392..7e1fc27e47 100644
--- a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstallation.cs
@@ -1,11 +1,22 @@
 using System;
 using System.Collections.Generic;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Net.Mime;
+using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 
+using Microsoft.Extensions.Logging;
+
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Api.Models.Internal;
+using Tgstation.Server.Common.Http;
 using Tgstation.Server.Host.Components.Deployment;
+using Tgstation.Server.Host.Components.Interop;
 using Tgstation.Server.Host.IO;
+using Tgstation.Server.Host.System;
+using Tgstation.Server.Host.Utils;
 
 #nullable disable
 
@@ -42,22 +53,38 @@ namespace Tgstation.Server.Host.Components.Engine
 		/// </summary>
 		readonly IIOManager ioManager;
 
+		/// <summary>
+		/// The <see cref="IAsyncDelayer"/> for the <see cref="OpenDreamInstallation"/>.
+		/// </summary>
+		readonly IAsyncDelayer asyncDelayer;
+
+		/// <summary>
+		/// The <see cref="IAbstractHttpClientFactory"/> for the <see cref="OpenDreamInstallation"/>.
+		/// </summary>
+		readonly IAbstractHttpClientFactory httpClientFactory;
+
 		/// <summary>
 		/// Initializes a new instance of the <see cref="OpenDreamInstallation"/> class.
 		/// </summary>
 		/// <param name="ioManager">The value of <see cref="ioManager"/>.</param>
+		/// <param name="asyncDelayer">The value of <see cref="asyncDelayer"/>.</param>
+		/// <param name="httpClientFactory">The value of <see cref="httpClientFactory"/>.</param>
 		/// <param name="serverExePath">The value of <see cref="ServerExePath"/>.</param>
 		/// <param name="compilerExePath">The value of <see cref="CompilerExePath"/>.</param>
 		/// <param name="installationTask">The value of <see cref="InstallationTask"/>.</param>
 		/// <param name="version">The value of <see cref="Version"/>.</param>
 		public OpenDreamInstallation(
 			IIOManager ioManager,
+			IAsyncDelayer asyncDelayer,
+			IAbstractHttpClientFactory httpClientFactory,
 			string serverExePath,
 			string compilerExePath,
 			Task installationTask,
 			EngineVersion version)
 		{
 			this.ioManager = ioManager ?? throw new ArgumentNullException(nameof(ioManager));
+			this.asyncDelayer = asyncDelayer ?? throw new ArgumentNullException(nameof(asyncDelayer));
+			this.httpClientFactory = httpClientFactory ?? throw new ArgumentNullException(nameof(httpClientFactory));
 			ServerExePath = serverExePath ?? throw new ArgumentNullException(nameof(serverExePath));
 			CompilerExePath = compilerExePath ?? throw new ArgumentNullException(nameof(compilerExePath));
 			InstallationTask = installationTask ?? throw new ArgumentNullException(nameof(installationTask));
@@ -78,15 +105,65 @@ namespace Tgstation.Server.Host.Components.Engine
 			ArgumentNullException.ThrowIfNull(parameters);
 			ArgumentNullException.ThrowIfNull(launchParameters);
 
+			if (!parameters.TryGetValue(DMApiConstants.ParamAccessIdentifier, out var accessIdentifier))
+				throw new ArgumentException($"parameters must have \"{DMApiConstants.ParamAccessIdentifier}\" set!", nameof(parameters));
+
 			var parametersString = EncodeParameters(parameters, launchParameters);
 
 			var loggingEnabled = logFilePath != null;
-			var arguments = $"--cvar {(loggingEnabled ? $"log.path=\"{ioManager.GetDirectoryName(logFilePath)}\" --cvar log.format=\"{ioManager.GetFileName(logFilePath)}\"" : "log.enabled=false")} --cvar log.runtimelog=false --cvar net.port={launchParameters.Port.Value} --cvar opendream.topic_port=0 --cvar opendream.world_params=\"{parametersString}\" --cvar opendream.json_path=\"./{dmbProvider.DmbName}\"";
+			var arguments = $"--cvar {(loggingEnabled ? $"log.path=\"{ioManager.GetDirectoryName(logFilePath)}\" --cvar log.format=\"{ioManager.GetFileName(logFilePath)}\"" : "log.enabled=false")} --cvar watchdog.token={accessIdentifier} --cvar log.runtimelog=false --cvar net.port={launchParameters.Port.Value} --cvar opendream.topic_port=0 --cvar opendream.world_params=\"{parametersString}\" --cvar opendream.json_path=\"./{dmbProvider.DmbName}\"";
 			return arguments;
 		}
 
 		/// <inheritdoc />
 		public override string FormatCompilerArguments(string dmePath)
 			=> $"--suppress-unimplemented --notices-enabled \"{dmePath ?? throw new ArgumentNullException(nameof(dmePath))}\"";
+
+		/// <inheritdoc />
+		public override async ValueTask StopServerProcess(
+			ILogger logger,
+			IProcess process,
+			string accessIdentifier,
+			ushort port,
+			CancellationToken cancellationToken)
+		{
+			const int MaximumTerminationSeconds = 5;
+
+			logger.LogTrace("Attempting Robust.Server graceful exit (Timeout: {seconds}s)...", MaximumTerminationSeconds);
+			var timeout = asyncDelayer.Delay(TimeSpan.FromSeconds(MaximumTerminationSeconds), cancellationToken);
+			var lifetime = process.Lifetime;
+
+			using var httpClient = httpClientFactory.CreateClient();
+			using var request = new HttpRequestMessage();
+			request.Headers.Add("WatchdogToken", accessIdentifier);
+			request.RequestUri = new Uri($"http://localhost:{port}/shutdown");
+			request.Content = new StringContent(
+				"{\"Reason\":\"TGS session termination\"}",
+				Encoding.UTF8,
+				new MediaTypeHeaderValue(MediaTypeNames.Application.Json));
+			request.Method = HttpMethod.Post;
+
+			var responseTask = httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
+
+			await Task.WhenAny(timeout, lifetime, responseTask);
+			if (responseTask.IsCompleted)
+			{
+				using var response = await responseTask;
+				if (response.IsSuccessStatusCode)
+				{
+					logger.LogDebug("Robust.Server responded to the shutdown command successfully. Waiting for exit...");
+					await Task.WhenAny(timeout, lifetime);
+				}
+			}
+
+			if (lifetime.IsCompleted)
+			{
+				logger.LogTrace("Robust.Server gracefully exited");
+				return;
+			}
+
+			logger.LogWarning("Robust.Server graceful exit timed out!");
+			await base.StopServerProcess(logger, process, accessIdentifier, port, cancellationToken);
+		}
 	}
 }
diff --git a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs
index cefdadd504..886b419a3e 100644
--- a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs
@@ -8,12 +8,14 @@ using Microsoft.Extensions.Options;
 
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Common.Extensions;
+using Tgstation.Server.Common.Http;
 using Tgstation.Server.Host.Common;
 using Tgstation.Server.Host.Components.Repository;
 using Tgstation.Server.Host.Configuration;
 using Tgstation.Server.Host.IO;
 using Tgstation.Server.Host.Jobs;
 using Tgstation.Server.Host.System;
+using Tgstation.Server.Host.Utils;
 
 #nullable disable
 
@@ -52,6 +54,11 @@ namespace Tgstation.Server.Host.Components.Engine
 		/// </summary>
 		protected IProcessExecutor ProcessExecutor { get; }
 
+		/// <summary>
+		/// The <see cref="GeneralConfiguration"/> for the <see cref="OpenDreamInstaller"/>.
+		/// </summary>
+		protected GeneralConfiguration GeneralConfiguration { get; }
+
 		/// <summary>
 		/// The <see cref="IPlatformIdentifier"/> for the <see cref="OpenDreamInstaller"/>.
 		/// </summary>
@@ -63,9 +70,14 @@ namespace Tgstation.Server.Host.Components.Engine
 		readonly IRepositoryManager repositoryManager;
 
 		/// <summary>
-		/// The <see cref="GeneralConfiguration"/> for the <see cref="OpenDreamInstaller"/>.
+		/// The <see cref="IAsyncDelayer"/> for the <see cref="OpenDreamInstaller"/>.
 		/// </summary>
-		protected GeneralConfiguration GeneralConfiguration { get; }
+		readonly IAsyncDelayer asyncDelayer;
+
+		/// <summary>
+		/// The <see cref="IAbstractHttpClientFactory"/> for the <see cref="OpenDreamInstaller"/>.
+		/// </summary>
+		readonly IAbstractHttpClientFactory httpClientFactory;
 
 		/// <summary>
 		/// Initializes a new instance of the <see cref="OpenDreamInstaller"/> class.
@@ -75,6 +87,8 @@ namespace Tgstation.Server.Host.Components.Engine
 		/// <param name="platformIdentifier">The value of <see cref="platformIdentifier"/>.</param>
 		/// <param name="processExecutor">The value of <see cref="ProcessExecutor"/>.</param>
 		/// <param name="repositoryManager">The value of <see cref="repositoryManager"/>.</param>
+		/// <param name="asyncDelayer">The value of <see cref="asyncDelayer"/>.</param>
+		/// <param name="httpClientFactory">The value of <see cref="httpClientFactory"/>.</param>
 		/// <param name="generalConfigurationOptions">The <see cref="IOptions{TOptions}"/> containing value of <see cref="GeneralConfiguration"/>.</param>
 		public OpenDreamInstaller(
 			IIOManager ioManager,
@@ -82,12 +96,16 @@ namespace Tgstation.Server.Host.Components.Engine
 			IPlatformIdentifier platformIdentifier,
 			IProcessExecutor processExecutor,
 			IRepositoryManager repositoryManager,
+			IAsyncDelayer asyncDelayer,
+			IAbstractHttpClientFactory httpClientFactory,
 			IOptions<GeneralConfiguration> generalConfigurationOptions)
 			: base(ioManager, logger)
 		{
 			this.platformIdentifier = platformIdentifier ?? throw new ArgumentNullException(nameof(platformIdentifier));
 			ProcessExecutor = processExecutor ?? throw new ArgumentNullException(nameof(processExecutor));
 			this.repositoryManager = repositoryManager ?? throw new ArgumentNullException(nameof(repositoryManager));
+			this.asyncDelayer = asyncDelayer ?? throw new ArgumentNullException(nameof(asyncDelayer));
+			this.httpClientFactory = httpClientFactory ?? throw new ArgumentNullException(nameof(httpClientFactory));
 			GeneralConfiguration = generalConfigurationOptions?.Value ?? throw new ArgumentNullException(nameof(generalConfigurationOptions));
 		}
 
@@ -101,6 +119,8 @@ namespace Tgstation.Server.Host.Components.Engine
 			GetExecutablePaths(path, out var serverExePath, out var compilerExePath);
 			return new OpenDreamInstallation(
 				IOManager,
+				asyncDelayer,
+				httpClientFactory,
 				serverExePath,
 				compilerExePath,
 				installationTask,
diff --git a/src/Tgstation.Server.Host/Components/Engine/WindowsOpenDreamInstaller.cs b/src/Tgstation.Server.Host/Components/Engine/WindowsOpenDreamInstaller.cs
index 3aa19f3e38..2fb12e80de 100644
--- a/src/Tgstation.Server.Host/Components/Engine/WindowsOpenDreamInstaller.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/WindowsOpenDreamInstaller.cs
@@ -7,11 +7,13 @@ using Microsoft.Extensions.Options;
 
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Common.Extensions;
+using Tgstation.Server.Common.Http;
 using Tgstation.Server.Host.Components.Repository;
 using Tgstation.Server.Host.Configuration;
 using Tgstation.Server.Host.IO;
 using Tgstation.Server.Host.Jobs;
 using Tgstation.Server.Host.System;
+using Tgstation.Server.Host.Utils;
 
 #nullable disable
 
@@ -35,6 +37,8 @@ namespace Tgstation.Server.Host.Components.Engine
 		/// <param name="platformIdentifier">The <see cref="IPlatformIdentifier"/> for the <see cref="OpenDreamInstaller"/>.</param>
 		/// <param name="processExecutor">The <see cref="IProcessExecutor"/> for the <see cref="OpenDreamInstaller"/>.</param>
 		/// <param name="repositoryManager">The <see cref="IRepositoryManager"/> for the <see cref="OpenDreamInstaller"/>.</param>
+		/// <param name="asyncDelayer">The <see cref="IAsyncDelayer"/> for the <see cref="OpenDreamInstaller"/>.</param>
+		/// <param name="httpClientFactory">The <see cref="IAbstractHttpClientFactory"/> for the <see cref="OpenDreamInstaller"/>.</param>
 		/// <param name="generalConfigurationOptions">The <see cref="IOptions{TOptions}"/> of <see cref="GeneralConfiguration"/> for the <see cref="OpenDreamInstaller"/>.</param>
 		/// <param name="linkFactory">The value of <see cref="linkFactory"/>.</param>
 		public WindowsOpenDreamInstaller(
@@ -43,6 +47,8 @@ namespace Tgstation.Server.Host.Components.Engine
 			IPlatformIdentifier platformIdentifier,
 			IProcessExecutor processExecutor,
 			IRepositoryManager repositoryManager,
+			IAsyncDelayer asyncDelayer,
+			IAbstractHttpClientFactory httpClientFactory,
 			IOptions<GeneralConfiguration> generalConfigurationOptions,
 			IFilesystemLinkFactory linkFactory)
 			: base(
@@ -51,6 +57,8 @@ namespace Tgstation.Server.Host.Components.Engine
 				platformIdentifier,
 				processExecutor,
 				repositoryManager,
+				asyncDelayer,
+				httpClientFactory,
 				generalConfigurationOptions)
 		{
 			this.linkFactory = linkFactory ?? throw new ArgumentNullException(nameof(linkFactory));
diff --git a/src/Tgstation.Server.Host/Components/Session/SessionController.cs b/src/Tgstation.Server.Host/Components/Session/SessionController.cs
index 51f7cdc126..9fbd96cca9 100644
--- a/src/Tgstation.Server.Host/Components/Session/SessionController.cs
+++ b/src/Tgstation.Server.Host/Components/Session/SessionController.cs
@@ -133,7 +133,7 @@ namespace Tgstation.Server.Host.Components.Session
 		/// <summary>
 		/// The <see cref="IEngineExecutableLock"/> for the <see cref="SessionController"/>.
 		/// </summary>
-		readonly IEngineExecutableLock byondLock;
+		readonly IEngineExecutableLock engineLock;
 
 		/// <summary>
 		/// The <see cref="IChatTrackingContext"/> for the <see cref="SessionController"/>.
@@ -226,7 +226,7 @@ namespace Tgstation.Server.Host.Components.Session
 		/// <param name="reattachInformation">The value of <see cref="ReattachInformation"/>.</param>
 		/// <param name="metadata">The owning <see cref="Instance"/>.</param>
 		/// <param name="process">The value of <see cref="process"/>.</param>
-		/// <param name="byondLock">The value of <see cref="byondLock"/>.</param>
+		/// <param name="engineLock">The value of <see cref="engineLock"/>.</param>
 		/// <param name="byondTopicSender">The value of <see cref="byondTopicSender"/>.</param>
 		/// <param name="bridgeRegistrar">The <see cref="IBridgeRegistrar"/> used to populate <see cref="bridgeRegistration"/>.</param>
 		/// <param name="chat">The value of <see cref="chat"/>.</param>
@@ -242,7 +242,7 @@ namespace Tgstation.Server.Host.Components.Session
 			ReattachInformation reattachInformation,
 			Api.Models.Instance metadata,
 			IProcess process,
-			IEngineExecutableLock byondLock,
+			IEngineExecutableLock engineLock,
 			Byond.TopicSender.ITopicClient byondTopicSender,
 			IChatTrackingContext chatTrackingContext,
 			IBridgeRegistrar bridgeRegistrar,
@@ -259,7 +259,7 @@ namespace Tgstation.Server.Host.Components.Session
 			ReattachInformation = reattachInformation ?? throw new ArgumentNullException(nameof(reattachInformation));
 			this.metadata = metadata ?? throw new ArgumentNullException(nameof(metadata));
 			this.process = process ?? throw new ArgumentNullException(nameof(process));
-			this.byondLock = byondLock ?? throw new ArgumentNullException(nameof(byondLock));
+			this.engineLock = engineLock ?? throw new ArgumentNullException(nameof(engineLock));
 			this.byondTopicSender = byondTopicSender ?? throw new ArgumentNullException(nameof(byondTopicSender));
 			this.chatTrackingContext = chatTrackingContext ?? throw new ArgumentNullException(nameof(chatTrackingContext));
 			ArgumentNullException.ThrowIfNull(bridgeRegistrar);
@@ -340,16 +340,21 @@ namespace Tgstation.Server.Host.Components.Session
 			Logger.LogTrace("Disposing...");
 
 			reattachTopicCts.Cancel();
-			var semaphoreLockTask = TopicSendSemaphore.Lock(CancellationToken.None); // DCT: None available
+			var cancellationToken = CancellationToken.None; // DCT: None available
+			var semaphoreLockTask = TopicSendSemaphore.Lock(cancellationToken);
 
 			if (!released)
 			{
-				process.Terminate();
-				await process.Lifetime;
+				await engineLock.StopServerProcess(
+					Logger,
+					process,
+					ReattachInformation.AccessIdentifier,
+					ReattachInformation.Port,
+					cancellationToken);
 			}
 
 			await process.DisposeAsync();
-			byondLock.Dispose();
+			engineLock.Dispose();
 			bridgeRegistration?.Dispose();
 			var regularDmbDisposeTask = ReattachInformation.Dmb.DisposeAsync();
 			var initialDmb = ReattachInformation.InitialDmb;
@@ -395,7 +400,7 @@ namespace Tgstation.Server.Host.Components.Session
 
 			ReattachInformation.Dmb.KeepAlive();
 			ReattachInformation.InitialDmb?.KeepAlive();
-			byondLock.DoNotDeleteThisSession();
+			engineLock.DoNotDeleteThisSession();
 			released = true;
 			return DisposeAsync();
 		}
diff --git a/src/Tgstation.Server.Host/System/IProcess.cs b/src/Tgstation.Server.Host/System/IProcess.cs
index af7409ee9d..b0783cbd7e 100644
--- a/src/Tgstation.Server.Host/System/IProcess.cs
+++ b/src/Tgstation.Server.Host/System/IProcess.cs
@@ -7,7 +7,7 @@ namespace Tgstation.Server.Host.System
 	/// <summary>
 	/// Abstraction over a <see cref="global::System.Diagnostics.Process"/>.
 	/// </summary>
-	interface IProcess : IProcessBase, IAsyncDisposable
+	public interface IProcess : IProcessBase, IAsyncDisposable
 	{
 		/// <summary>
 		/// The <see cref="IProcess"/>' ID.
diff --git a/src/Tgstation.Server.Host/System/IProcessBase.cs b/src/Tgstation.Server.Host/System/IProcessBase.cs
index 3d1030f645..d7a20f43b7 100644
--- a/src/Tgstation.Server.Host/System/IProcessBase.cs
+++ b/src/Tgstation.Server.Host/System/IProcessBase.cs
@@ -6,7 +6,7 @@ namespace Tgstation.Server.Host.System
 	/// <summary>
 	/// Represents process lifetime.
 	/// </summary>
-	interface IProcessBase
+	public interface IProcessBase
 	{
 		/// <summary>
 		/// The <see cref="Task{TResult}"/> resulting in the exit code of the process or <see langword="null"/> if the process was detached.
diff --git a/tests/Tgstation.Server.Host.Tests/Components/Engine/TestOpenDreamInstaller.cs b/tests/Tgstation.Server.Host.Tests/Components/Engine/TestOpenDreamInstaller.cs
index 6b8024ddac..30d995f99c 100644
--- a/tests/Tgstation.Server.Host.Tests/Components/Engine/TestOpenDreamInstaller.cs
+++ b/tests/Tgstation.Server.Host.Tests/Components/Engine/TestOpenDreamInstaller.cs
@@ -9,10 +9,12 @@ using Moq;
 
 using Tgstation.Server.Api.Models;
 using Tgstation.Server.Api.Models.Internal;
+using Tgstation.Server.Common.Http;
 using Tgstation.Server.Host.Components.Repository;
 using Tgstation.Server.Host.Configuration;
 using Tgstation.Server.Host.IO;
 using Tgstation.Server.Host.System;
+using Tgstation.Server.Host.Utils;
 
 namespace Tgstation.Server.Host.Components.Engine.Tests
 {
@@ -69,6 +71,8 @@ namespace Tgstation.Server.Host.Components.Engine.Tests
 				Mock.Of<IPlatformIdentifier>(),
 				Mock.Of<IProcessExecutor>(),
 				mockRepositoryManager.Object,
+				Mock.Of<IAsyncDelayer>(),
+				Mock.Of<IAbstractHttpClientFactory>(),
 				mockGeneralConfigOptions.Object);
 
 			var data = await installer.DownloadVersion(
diff --git a/tests/Tgstation.Server.Tests/Live/Instance/InstanceTest.cs b/tests/Tgstation.Server.Tests/Live/Instance/InstanceTest.cs
index a50d4a6504..76bfa30b23 100644
--- a/tests/Tgstation.Server.Tests/Live/Instance/InstanceTest.cs
+++ b/tests/Tgstation.Server.Tests/Live/Instance/InstanceTest.cs
@@ -17,6 +17,7 @@ using Tgstation.Server.Api.Models.Request;
 using Tgstation.Server.Api.Models.Response;
 using Tgstation.Server.Client;
 using Tgstation.Server.Client.Components;
+using Tgstation.Server.Common.Http;
 using Tgstation.Server.Host.Components;
 using Tgstation.Server.Host.Components.Engine;
 using Tgstation.Server.Host.Components.Events;
@@ -25,6 +26,7 @@ using Tgstation.Server.Host.Configuration;
 using Tgstation.Server.Host.IO;
 using Tgstation.Server.Host.Jobs;
 using Tgstation.Server.Host.System;
+using Tgstation.Server.Host.Utils;
 
 namespace Tgstation.Server.Tests.Live.Instance
 {
@@ -116,6 +118,8 @@ namespace Tgstation.Server.Tests.Live.Instance
 						Mock.Of<ILogger<Repository>>(),
 						Mock.Of<ILogger<RepositoryManager>>(),
 						genConfig),
+					Mock.Of<IAsyncDelayer>(),
+					Mock.Of<IAbstractHttpClientFactory>(),
 					mockOptions.Object)
 				: new PlatformIdentifier().IsWindows
 					? new WindowsByondInstaller(
diff --git a/tests/Tgstation.Server.Tests/Live/Instance/WatchdogTest.cs b/tests/Tgstation.Server.Tests/Live/Instance/WatchdogTest.cs
index c1778e63fa..4b08e3ae1f 100644
--- a/tests/Tgstation.Server.Tests/Live/Instance/WatchdogTest.cs
+++ b/tests/Tgstation.Server.Tests/Live/Instance/WatchdogTest.cs
@@ -1013,7 +1013,7 @@ namespace Tgstation.Server.Tests.Live.Instance
 			Assert.IsNotNull(sessionObj);
 
 			var session = (ISessionController)sessionObj;
-			return session.ReattachInformation.Port;
+			return session.ReattachInformation.TopicPort ?? session.ReattachInformation.Port;
 		}
 
 		// - Uses instance manager concrete