diff --git a/Fika.Core/FikaPlugin.cs b/Fika.Core/FikaPlugin.cs
index 848ffe38..10a0aae6 100644
--- a/Fika.Core/FikaPlugin.cs
+++ b/Fika.Core/FikaPlugin.cs
@@ -246,7 +246,7 @@ protected void Awake()
         private IEnumerator RunModHandler()
         {
             yield return new WaitForSeconds(5);
-            ModHandler.Run();
+            ModHandler.VerifyMods();
         }
 
         private void GetClientConfig()
diff --git a/Fika.Core/Networking/Models/ModValidationResponse.cs b/Fika.Core/Networking/Models/ModValidationResponse.cs
new file mode 100644
index 00000000..f5fba64c
--- /dev/null
+++ b/Fika.Core/Networking/Models/ModValidationResponse.cs
@@ -0,0 +1,17 @@
+using System.Runtime.Serialization;
+
+namespace Fika.Core.Networking.Http.Models
+{
+    [DataContract]
+    public struct ModValidationResponse
+    {
+        [DataMember(Name = "forbidden")]
+        public string[] Forbidden;
+
+        [DataMember(Name = "missingRequired")]
+        public string[] MissingRequired;
+
+        [DataMember(Name = "hashMismatch")]
+        public string[] HashMismatch;
+    }
+}
\ No newline at end of file
diff --git a/Fika.Core/Utils/FikaModHandler.cs b/Fika.Core/Utils/FikaModHandler.cs
index c3480226..65e06c82 100644
--- a/Fika.Core/Utils/FikaModHandler.cs
+++ b/Fika.Core/Utils/FikaModHandler.cs
@@ -1,70 +1,111 @@
 using BepInEx;
 using BepInEx.Bootstrap;
 using BepInEx.Logging;
-using Fika.Core.Networking.Models;
+using Comfort.Common;
+using EFT;
+using EFT.UI;
+using Fika.Core.Networking.Http.Models;
 using LiteNetLib.Utils;
+using Newtonsoft.Json;
+using SPT.Common.Http;
+using System.Collections;
 using System.Collections.Generic;
 using System.IO;
+using UnityEngine;
+using Logger = BepInEx.Logging.Logger;
 
 namespace Fika.Core.Utils
 {
     public class FikaModHandler
     {
-        private string[] loadedMods;
         private readonly ManualLogSource logger = Logger.CreateLogSource("FikaModHandler");
 
         public bool QuestingBotsLoaded = false;
         public bool SAINLoaded = false;
 
-        public void Run()
+        public void VerifyMods()
         {
-            // Store all loaded plugins (mods) to improve compatibility
-            List<string> tempPluginInfos = [];
+            PluginInfo[] pluginInfos = [.. Chainloader.PluginInfos.Values];
+
+            // Set capacity to avoid unnecessarily resizing for people who have a lot of mods loaded
+            Dictionary<string, uint> loadedMods = new Dictionary<string, uint>(pluginInfos.Length);
+
+            foreach (PluginInfo pluginInfo in pluginInfos)
+            {
+                string location = pluginInfo.Location;
+                byte[] fileBytes = File.ReadAllBytes(location);
+                uint crc32 = CRC32C.Compute(fileBytes, 0, fileBytes.Length);
+                loadedMods.Add(pluginInfo.Metadata.GUID, crc32);
+                logger.LogInfo($"Loaded plugin: [{pluginInfo.Metadata.Name}] with GUID [{pluginInfo.Metadata.GUID}] and crc32 [{crc32}]");
+                CheckSpecialMods(pluginInfo.Metadata.GUID);
+            }
+
+            string modValidationRequestJson = JsonConvert.SerializeObject(loadedMods);
+            logger.LogDebug(modValidationRequestJson);
+
+            string validationJson = RequestHandler.PostJson("/fika/client/check/mods", modValidationRequestJson);
+            logger.LogDebug(validationJson);
 
-            foreach (string key in Chainloader.PluginInfos.Keys)
+            ModValidationResponse validationResult = 
+                JsonConvert.DeserializeObject<ModValidationResponse>(validationJson);
+
+            // If any errors were detected we will print what has happened
+            bool installationError =
+                validationResult.Forbidden.Length > 0 ||
+                validationResult.MissingRequired.Length > 0 ||
+                validationResult.HashMismatch.Length > 0;
+
+            if (validationResult.Forbidden.Length > 0)
             {
-                logger.LogInfo($"Adding {key}, {Chainloader.PluginInfos[key].Metadata.Name} to loaded mods.");
-                tempPluginInfos.Add(key);
-                CheckSpecialMods(key);
+                logger.LogError($"{validationResult.Forbidden.Length} forbidden mod(s) are loaded, have the server host allow or remove the following mods: {string.Join(", ", validationResult.Forbidden)}");
             }
 
-            /*if (FikaPlugin.Instance.RequiredMods.Count > 0)
+            if (validationResult.MissingRequired.Length > 0)
             {
-                VerifyMods();
-            }*/
+                logger.LogError($"{validationResult.MissingRequired.Length} missing required mod(s), verify the following mods are present: {string.Join(", ", validationResult.MissingRequired)}");
+            }
 
-            loadedMods = [.. tempPluginInfos];
+            if (validationResult.HashMismatch.Length > 0)
+            {
+                logger.LogWarning($"{validationResult.HashMismatch.Length} mismatched mod(s) are loaded, verify the following mods are up to date with the server host: {string.Join(", ", validationResult.HashMismatch)}");
+            }
 
-            logger.LogInfo($"Loaded {loadedMods.Length} mods!");
+            if (installationError)
+            {
+                StaticManager.BeginCoroutine(InformInstallationError());
+            }
         }
 
-        private void VerifyMods()
+        private IEnumerator InformInstallationError()
         {
-            PluginInfo[] pluginInfos = [.. Chainloader.PluginInfos.Values];
-            Dictionary<string, string> loadedMods = [];
-
-            foreach (PluginInfo pluginInfo in pluginInfos)
+            while (!Singleton<PreloaderUI>.Instantiated)
             {
-                string location = pluginInfo.Location;
-                byte[] fileBytes = File.ReadAllBytes(location);
-                uint crc32 = CRC32C.Compute(fileBytes, 0, fileBytes.Length);
-                loadedMods.Add(pluginInfo.Metadata.GUID, crc32.ToString());
+                yield return null;
             }
 
-            ModValidationRequest modValidationRequest = new(loadedMods);
-            // Send
+            string message = "Your client doesn't meet server requirements, check logs for more details";
+
+            // -1f time makes the message permanent
+            Singleton<PreloaderUI>.Instance.ShowCriticalErrorScreen("INSTALLATION ERROR", message,
+                ErrorScreen.EButtonType.QuitButton, -1f, Application.Quit, null);
         }
 
         private void CheckSpecialMods(string key)
         {
-            if (key == "com.DanW.QuestingBots")
+            switch (key)
             {
-                QuestingBotsLoaded = true;
-            }
+                case "com.DanW.QuestingBots":
+                    {
+                        QuestingBotsLoaded = true;
 
-            if (key == "me.sol.sain")
-            {
-                SAINLoaded = true;
+                        break;
+                    }
+                case "me.sol.sain":
+                    {
+                        SAINLoaded = true;
+
+                        break;
+                    }
             }
         }
     }