diff --git a/back/mc-connector.js b/back/mc-connector.js
index 8719292..e31e1e0 100644
--- a/back/mc-connector.js
+++ b/back/mc-connector.js
@@ -13,6 +13,7 @@ const {getMainWindow} = require("./electron-tools");
 const runningClients = onArrayChange([], () => {
     invoke("mc:runningClients", runningClients.length)
 })
+let mcInstance = null
 
 
 function afterLaunchCalls(){
@@ -33,13 +34,50 @@ function askLogin() {
     const msMc = new auth('select_account')
 
     return new Promise((resolve) => {
-        msMc.on('load', console.log).launch('electron').then(async e => {
+        msMc.launch('electron').then(async e => {
             const mc = await e.getMinecraft()
             let credentials = mc.mclc()
 
             settings.set("credentials", credentials)
+            settings.set("refresh-token", e.msToken)
+
+            mcInstance = e
+            resolve(credentials)
+        }).catch(() => {
+            mcInstance = null
+            resolve(null)
+        })
+    })
+}
+function askValidate(){
+    if(!mcInstance) return false
+
+    return mcInstance.validate()
+}
+function refreshLogin(forceReLogin = false){
+    if(!settings.get("refresh-token")) return null
+
+    const msMc = new auth("none")
+    return new Promise((resolve) => {
+        msMc.refresh(settings.get("refresh-token")).then(async e => {
+            const mc = await e.getMinecraft()
+            let credentials = mc.mclc()
+
+            if(credentials.access_token !== settings.get("credentials").access_token){
+                settings.set("credentials", credentials)
+                settings.set("refresh-token", e.msToken)
+            }
+
+            mcInstance = e
             resolve(credentials)
-        }).catch(() => {resolve(null)})
+        }).catch(() => {
+            mcInstance = null
+            if(forceReLogin){
+                askLogin().then(resolve)
+            }else{
+                resolve(null)
+            }
+        })
     })
 }
 function logout(){
@@ -47,6 +85,14 @@ function logout(){
 }
 
 function launchVanilla(version) {
+    invoke("mc:initGame")
+
+    if(!askValidate()){
+        refreshLogin(true).then(() => launchVanilla(version))
+        invoke("mc:close", 0)
+        return
+    }
+
     const launcher = new Client()
     runningClients.push(launcher)
 
@@ -69,8 +115,6 @@ function launchVanilla(version) {
         }
     }
 
-    invoke("mc:initGame")
-
     launcher.launch(opts).then(() => {
         invoke("mc:gameLaunched")
         afterLaunchCalls()
@@ -93,6 +137,14 @@ function launchVanilla(version) {
 }
 
 function launchModded(manifest) {
+    invoke("mc:initGame")
+
+    if(!askValidate()){
+        refreshLogin(true).then(() => launchModded(manifest))
+        invoke("mc:close", 0)
+        return
+    }
+
     const rootPath = path.join(settings.get("mcPath"), "mod-packs", manifest.id)
 
     let currentManifest
@@ -113,8 +165,6 @@ function launchModded(manifest) {
         installNeeded = true
     }
 
-    invoke("mc:initGame")
-
     if(installNeeded){
         let del = [
             "bin",
@@ -183,10 +233,15 @@ function launchModded(manifest) {
 }
 
 registerIpcListener("dialog:askLogin", askLogin)
+registerIpcListener("dialog:askValidate", askValidate)
+registerIpcListener("dialog:refreshLogin", refreshLogin)
 registerIpcListener("dialog:logout", logout)
 registerIpcListener("mc:launchVanilla", (e, v) => launchVanilla(v))
 registerIpcListener("mc:launchModded", (e, v) => launchModded(v))
 
 module.exports = {
-    askLogin
+    askLogin,
+    askValidate,
+    refreshLogin,
+    logout
 }
diff --git a/back/utils.js b/back/utils.js
index adf2c39..f3bb3c8 100644
--- a/back/utils.js
+++ b/back/utils.js
@@ -1,11 +1,12 @@
 const os = require("os");
-const {registerIpcListener} = require("./ipc-handler");
+const {registerIpcListener, registerIpcListenerSync} = require("./ipc-handler");
 const {platform} = require("./config");
 const childProcess = require("child_process");
 const fs = require("fs");
 const path = require("path");
 
 
+registerIpcListenerSync("log", console.log)
 registerIpcListener("get-ram-amount", () => {
     return Math.round(os.totalmem() / 1024 / 1024);
 })
diff --git a/front_src/src/App.tsx b/front_src/src/App.tsx
index 41c2e91..eb824b1 100644
--- a/front_src/src/App.tsx
+++ b/front_src/src/App.tsx
@@ -11,6 +11,7 @@ import LaunchBarPane from "./components/LaunchBarPane";
 import LaunchProgressPane from "./components/LaunchProgressPane";
 import UpdateInfo from "./components/UpdateInfo";
 import GameInfo from "./components/GameInfo";
+import {exposedFunctions} from "./utils/constants";
 
 
 function App(){
@@ -28,6 +29,9 @@ function App(){
 
         loadModPacks().then(setModPacks)
         getSetting("credentials").then(setUserData)
+        exposedFunctions("dialog").askValidate().then((bool: boolean) => {
+            if(!bool) exposedFunctions("dialog").refreshLogin().then(setUserData)
+        })
     }, [])
 
     useEffect(() => {
diff --git a/preload.js b/preload.js
index 8985278..ecfb17d 100644
--- a/preload.js
+++ b/preload.js
@@ -2,6 +2,7 @@ const { contextBridge, ipcRenderer } = require("electron")
 
 
 contextBridge.exposeInMainWorld("utils", {
+    log: (message) => ipcRenderer.send("log", message),
     hashing: {
         sha512: (string) => crypto.createHash("sha512").update(string).digest("hex")
     },
@@ -42,6 +43,15 @@ contextBridge.exposeInMainWorld("dialog", {
     },
     askLogin: () => {
         return ipcRenderer.invoke("dialog:askLogin")
+    },
+    askValidate: () => {
+        return ipcRenderer.invoke("dialog:askValidate")
+    },
+    refreshLogin: () => {
+        return ipcRenderer.invoke("dialog:refreshLogin")
+    },
+    logout: () => {
+        return ipcRenderer.invoke("dialog:logout")
     }
 })
 contextBridge.exposeInMainWorld("mc", {