I saw a mudcrab the other day. Horrible creatures

Libraries/SPTarkov.Server.Core/Helpers/HttpServerHelper.cs

@@ -54,6 +54,28 @@ public class HttpServerHelper(ConfigServer configServer)
         return $"wss://{BuildUrl()}";
     }
 
+    /// <summary>
+    /// Method to determine if another version of the server is already running
+    /// </summary>
+    /// <returns>bool isAlreadyRunning</returns>
+    public async Task<bool> IsAlreadyRunning()
+    {
+        try
+        {
+            var handler = new HttpClientHandler()
+            {
+                ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
+            };
+            var http = new HttpClient(handler);
+            var res = await http.PostAsync($"{GetBackendUrl()}/launcher/ping", null);
+            return res.IsSuccessStatusCode;
+        }
+        catch (Exception )
+        {
+            return false;
+        }
+    }
+
     public void SendTextJson(HttpResponse resp, object output)
     {
         resp.Headers.Append("Content-Type", mime["json"]);

Libraries/SPTarkov.Server.Core/Utils/App.cs

@@ -1,5 +1,6 @@
 using SPTarkov.DI.Annotations;
 using SPTarkov.Server.Core.DI;
+using SPTarkov.Server.Core.Helpers;
 using SPTarkov.Server.Core.Models.Spt.Config;
 using SPTarkov.Server.Core.Models.Utils;
 using SPTarkov.Server.Core.Servers;
@@ -17,6 +18,7 @@ public class App
     protected DatabaseService _databaseService;
     protected EncodingUtil _encodingUtil;
     protected HttpServer _httpServer;
+    protected HttpServerHelper _httpServerHelper;
     protected LocalisationService _localisationService;
 
     protected ISptLogger<App> _logger;
@@ -36,7 +38,8 @@ public class App
         HttpServer httpServer,
         DatabaseService databaseService,
         IEnumerable<IOnLoad> onLoadComponents,
-        IEnumerable<IOnUpdate> onUpdateComponents
+        IEnumerable<IOnUpdate> onUpdateComponents,
+        HttpServerHelper httpServerHelper
     )
     {
         _logger = logger;
@@ -46,6 +49,7 @@ public class App
         _configServer = configServer;
         _encodingUtil = encodingUtil;
         _httpServer = httpServer;
+        _httpServerHelper = httpServerHelper;
         _databaseService = databaseService;
         _onLoad = onLoadComponents;
         _onUpdate = onUpdateComponents;
@@ -58,6 +62,13 @@ public class App
         // execute onLoad callbacks
         _logger.Info(_localisationService.GetText("executing_startup_callbacks"));
 
+        var isAlreadyRunning = await _httpServerHelper.IsAlreadyRunning();
+        if (isAlreadyRunning)
+        {
+            _logger.Critical(_localisationService.GetText("webserver_already_running"));
+            Environment.Exit(1);
+        }
+
         if (_logger.IsLogEnabled(LogLevel.Debug))
         {
             _logger.Debug($"OS: {Environment.OSVersion.Version} | {Environment.OSVersion.Platform}");