diff --git a/src/client/Main.ts b/src/client/Main.ts
index e1a72f887..3f6b7ccd4 100644
--- a/src/client/Main.ts
+++ b/src/client/Main.ts
@@ -1,6 +1,8 @@
 import favicon from "../../resources/images/Favicon.svg";
 import version from "../../resources/version.txt";
+import { UserMeResponse } from "../core/ApiSchemas";
 import { GameRecord, GameStartInfo, ID } from "../core/Schemas";
+import { ServerConfig } from "../core/configuration/Config";
 import { getServerConfigFromClient } from "../core/configuration/ConfigLoader";
 import { GameType } from "../core/game/Game";
 import { UserSettings } from "../core/game/UserSettings";
@@ -201,13 +203,105 @@ class Client {
       territoryModal.open();
     });
 
+    loginDiscordButton.addEventListener("click", discordLogin);
+    const onUserMe = async (userMeResponse: UserMeResponse | false) => {
+      const config = await getServerConfigFromClient();
+      if (!hasAllowedFlare(userMeResponse, config)) {
+        if (userMeResponse === false) {
+          // Login is required
+          document.body.innerHTML = `
+            <div style="
+              display: flex;
+              justify-content: center;
+              align-items: center;
+              height: 100vh;
+              margin: 0;
+              font-family: sans-serif;
+              background-size: cover;
+              background-position: center;
+            ">
+              <div style="
+                background-color: rgba(0, 0, 0, 0.7);
+                color: white;
+                padding: 2em;
+                margin: 5em;
+                border-radius: 12px;
+                text-align: center;
+                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
+              ">
+                <p style="margin-bottom: 1em;">Login is required to access this website.</p>
+                <p style="margin-bottom: 1.5em;">You are being redirected...</p>
+                <div style="width: 100%; height: 8px; background-color: #444; border-radius: 4px; overflow: hidden;">
+                  <div style="
+                    height: 100%;
+                    width: 0%;
+                    background-color: #4caf50;
+                    animation: fillBar 5s linear forwards;
+                  "></div>
+                </div>
+              </div>
+            </div>
+            <div class="bg-image"></div>
+            <style>
+              @keyframes fillBar {
+                from { width: 0%; }
+                to { width: 100%; }
+              }
+            </style>
+          `;
+          setTimeout(discordLogin, 5000);
+        } else {
+          // Unauthorized
+          document.body.innerHTML = `
+            <div style="
+              display: flex;
+              justify-content: center;
+              align-items: center;
+              height: 100vh;
+              margin: 0;
+              font-family: sans-serif;
+              background-size: cover;
+              background-position: center;
+            ">
+              <div style="
+                background-color: rgba(0, 0, 0, 0.7);
+                color: white;
+                padding: 2em;
+                margin: 5em;
+                border-radius: 12px;
+                text-align: center;
+                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
+              ">
+                <p style="margin-bottom: 1em;">You are not authorized to access this website.</p>
+                <p>If you believe you are seeing this message in error, please contact the website administrator.</p>
+              </div>
+            </div>
+            <div class="bg-image"></div>
+          `;
+        }
+        return;
+      } else if (userMeResponse === false) {
+        // Not logged in
+        loginDiscordButton.disable = false;
+        loginDiscordButton.hidden = false;
+        loginDiscordButton.translationKey = "main.login_discord";
+        logoutDiscordButton.hidden = true;
+        territoryModal.onUserMe(null);
+      } else {
+        // Authorized
+        console.log(
+          `Your player ID is ${userMeResponse.player.publicId}\n` +
+            "Sharing this ID will allow others to view your game history and stats.",
+        );
+        loginDiscordButton.translationKey = "main.logged_in";
+        loginDiscordButton.hidden = true;
+        territoryModal.onUserMe(userMeResponse);
+      }
+    };
+
     if (isLoggedIn() === false) {
       // Not logged in
-      loginDiscordButton.disable = false;
-      loginDiscordButton.translationKey = "main.login_discord";
-      loginDiscordButton.addEventListener("click", discordLogin);
-      logoutDiscordButton.hidden = true;
-      territoryModal.onUserMe(null);
+      onUserMe(false);
     } else {
       // JWT appears to be valid
       loginDiscordButton.disable = true;
@@ -216,33 +310,11 @@ class Client {
       logoutDiscordButton.addEventListener("click", () => {
         // Log out
         logOut();
-        territoryModal.onUserMe(null);
-        loginDiscordButton.disable = false;
-        loginDiscordButton.translationKey = "main.login_discord";
-        loginDiscordButton.hidden = false;
-        loginDiscordButton.addEventListener("click", discordLogin);
-        logoutDiscordButton.hidden = true;
+        onUserMe(false);
       });
       // Look up the discord user object.
       // TODO: Add caching
-      getUserMe().then((userMeResponse) => {
-        if (userMeResponse === false) {
-          // Not logged in
-          loginDiscordButton.disable = false;
-          loginDiscordButton.translationKey = "main.login_discord";
-          loginDiscordButton.addEventListener("click", discordLogin);
-          logoutDiscordButton.hidden = true;
-          territoryModal.onUserMe(null);
-          return;
-        }
-        console.log(
-          `Your player ID is ${userMeResponse.player.publicId}\n` +
-            "Sharing this ID will allow others to view your game history and stats.",
-        );
-        loginDiscordButton.translationKey = "main.logged_in";
-        loginDiscordButton.hidden = true;
-        territoryModal.onUserMe(userMeResponse);
-      });
+      getUserMe().then(onUserMe);
     }
 
     const settingsModal = document.querySelector(
@@ -479,3 +551,15 @@ function getPersistentIDFromCookie(): string {
 
   return newID;
 }
+
+function hasAllowedFlare(
+  userMeResponse: UserMeResponse | false,
+  config: ServerConfig,
+) {
+  const allowed = config.allowedFlares();
+  if (allowed === undefined) return true;
+  if (userMeResponse === false) return false;
+  const flares = userMeResponse.player.flares;
+  if (flares === undefined) return false;
+  return allowed.length === 0 || allowed.some((f) => flares.includes(f));
+}
diff --git a/src/client/jwt.ts b/src/client/jwt.ts
index da5af1818..93221592d 100644
--- a/src/client/jwt.ts
+++ b/src/client/jwt.ts
@@ -7,6 +7,7 @@ import {
   UserMeResponse,
   UserMeResponseSchema,
 } from "../core/ApiSchemas";
+import { getServerConfigFromClient } from "../core/configuration/ConfigLoader";
 
 function getAudience() {
   const { hostname } = new URL(window.location.href);
@@ -22,6 +23,7 @@ export function getApiBase() {
 }
 
 function getToken(): string | null {
+  // Check window hash
   const { hash } = window.location;
   if (hash.startsWith("#")) {
     const params = new URLSearchParams(hash.slice(1));
@@ -40,9 +42,31 @@ function getToken(): string | null {
         (params.size > 0 ? "#" + params.toString() : ""),
     );
   }
+
+  // Check cookie
+  const cookie = document.cookie
+    .split(";")
+    .find((c) => c.trim().startsWith("token="))
+    ?.trim()
+    .substring(6);
+  if (cookie !== undefined) {
+    return cookie;
+  }
+
+  // Check local storage
   return localStorage.getItem("token");
 }
 
+async function clearToken() {
+  localStorage.removeItem("token");
+  __isLoggedIn = false;
+  const config = await getServerConfigFromClient();
+  const audience = config.jwtAudience();
+  const isSecure = window.location.protocol === "https:";
+  const secure = isSecure ? "; Secure" : "";
+  document.cookie = `token=logged_out; Path=/; Max-Age=0; Domain=${audience}${secure}`;
+}
+
 export function discordLogin() {
   window.location.href = `${getApiBase()}/login/discord?redirect_uri=${window.location.href}`;
 }
@@ -54,10 +78,9 @@ export function getAuthHeader(): string {
 }
 
 export async function logOut(allSessions: boolean = false) {
-  const token = localStorage.getItem("token");
+  const token = getToken();
   if (token === null) return;
-  localStorage.removeItem("token");
-  __isLoggedIn = false;
+  clearToken();
 
   const response = await fetch(
     getApiBase() + (allSessions ? "/revoke" : "/logout"),
@@ -177,8 +200,7 @@ export async function postRefresh(): Promise<boolean> {
       },
     });
     if (response.status === 401) {
-      localStorage.removeItem("token");
-      __isLoggedIn = false;
+      clearToken();
       return false;
     }
     if (response.status !== 200) return false;
@@ -209,8 +231,7 @@ export async function getUserMe(): Promise<UserMeResponse | false> {
       },
     });
     if (response.status === 401) {
-      localStorage.removeItem("token");
-      __isLoggedIn = false;
+      clearToken();
       return false;
     }
     if (response.status !== 200) return false;
diff --git a/src/core/configuration/Config.ts b/src/core/configuration/Config.ts
index f9b3d3bcb..cab53fc83 100644
--- a/src/core/configuration/Config.ts
+++ b/src/core/configuration/Config.ts
@@ -61,6 +61,7 @@ export interface ServerConfig {
   cloudflareConfigPath(): string;
   cloudflareCredsPath(): string;
   stripePublishableKey(): string;
+  allowedFlares(): string[] | undefined;
 }
 
 export interface NukeMagnitude {
diff --git a/src/core/configuration/DefaultConfig.ts b/src/core/configuration/DefaultConfig.ts
index a7fcf4a54..77087b6f2 100644
--- a/src/core/configuration/DefaultConfig.ts
+++ b/src/core/configuration/DefaultConfig.ts
@@ -70,6 +70,9 @@ const numPlayersConfig = {
 } as const satisfies Record<GameMapType, [number, number, number]>;
 
 export abstract class DefaultServerConfig implements ServerConfig {
+  allowedFlares(): string[] | undefined {
+    return;
+  }
   stripePublishableKey(): string {
     return process.env.STRIPE_PUBLISHABLE_KEY ?? "";
   }
diff --git a/src/core/configuration/DevConfig.ts b/src/core/configuration/DevConfig.ts
index 2b713d9cb..d14a29665 100644
--- a/src/core/configuration/DevConfig.ts
+++ b/src/core/configuration/DevConfig.ts
@@ -42,6 +42,11 @@ export class DevServerConfig extends DefaultServerConfig {
   subdomain(): string {
     return "";
   }
+  allowedFlares(): string[] | undefined {
+    return [
+      // Require login but do not rqeuire any flares
+    ];
+  }
 }
 
 export class DevConfig extends DefaultConfig {
diff --git a/src/core/configuration/PreprodConfig.ts b/src/core/configuration/PreprodConfig.ts
index 78662578c..a0567aaa9 100644
--- a/src/core/configuration/PreprodConfig.ts
+++ b/src/core/configuration/PreprodConfig.ts
@@ -11,4 +11,9 @@ export const preprodConfig = new (class extends DefaultServerConfig {
   jwtAudience(): string {
     return "openfront.dev";
   }
+  allowedFlares(): string[] | undefined {
+    return [
+      // "access:openfront.dev"
+    ];
+  }
 })();
diff --git a/src/server/Worker.ts b/src/server/Worker.ts
index 5888209a7..489c0258f 100644
--- a/src/server/Worker.ts
+++ b/src/server/Worker.ts
@@ -345,8 +345,8 @@ export function startWorker() {
           // Verify token signature
           const result = await verifyClientToken(clientMsg.token, config);
           if (result === false) {
-            log.warn("Failed to verify token");
-            ws.close(1002, "Failed to verify token");
+            log.warn("Unauthorized: Invalid token");
+            ws.close(1002, "Unauthorized");
             return;
           }
           const { persistentId, claims } = result;
@@ -354,18 +354,36 @@ export function startWorker() {
           let roles: string[] | undefined;
           let flares: string[] | undefined;
 
+          const allowedFlares = config.allowedFlares();
           if (claims === null) {
-            // TODO: Verify that the persistendId is is not a registered player
+            if (allowedFlares !== undefined) {
+              log.warn("Unauthorized: Anonymous user attempted to join game");
+              ws.close(1002, "Unauthorized");
+              return;
+            }
           } else {
             // Verify token and get player permissions
             const result = await getUserMe(clientMsg.token, config);
             if (result === false) {
-              log.warn("Failed to verify token");
-              ws.close(1002, "Failed to verify token");
+              log.warn("Unauthorized: Invalid session");
+              ws.close(1002, "Unauthorized");
               return;
             }
             roles = result.player.roles;
             flares = result.player.flares;
+
+            if (allowedFlares !== undefined) {
+              const allowed =
+                allowedFlares.length === 0 ||
+                allowedFlares.some((f) => flares?.includes(f));
+              if (!allowed) {
+                log.warn(
+                  "Forbidden: player without an allowed flare attempted to join game",
+                );
+                ws.close(1002, "Forbidden");
+                return;
+              }
+            }
           }
 
           // Check if the flag is allowed
diff --git a/tests/util/TestServerConfig.ts b/tests/util/TestServerConfig.ts
index 5db2c4ca4..5babd040f 100644
--- a/tests/util/TestServerConfig.ts
+++ b/tests/util/TestServerConfig.ts
@@ -4,6 +4,9 @@ import { GameMapType } from "../../src/core/game/Game";
 import { GameID } from "../../src/core/Schemas";
 
 export class TestServerConfig implements ServerConfig {
+  allowedFlares(): string[] | undefined {
+    throw new Error("Method not implemented.");
+  }
   stripePublishableKey(): string {
     throw new Error("Method not implemented.");
   }