diff --git a/addon/controllers/sockets/view.js b/addon/controllers/sockets/view.js
index 864dadc..9801172 100644
--- a/addon/controllers/sockets/view.js
+++ b/addon/controllers/sockets/view.js
@@ -43,6 +43,54 @@ export default class SocketsViewController extends BaseController {
         return window.history.back();
     }
 
+    /**
+     * Whether the last subscription attempt was refused. Cleared when the
+     * channel subscribes (the socket service resubscribes channels it lost
+     * for token reasons) and when leaving the page.
+     *
+     * @memberof SocketsViewController
+     */
+    @tracked subscriptionFailed = false;
+
+    /**
+     * The "Awaiting events..." indicator only makes sense while the channel can
+     * still deliver something.
+     *
+     * @memberof SocketsViewController
+     */
+    get isAwaitingEvents() {
+        return this.events.length > 0 && !this.subscriptionFailed;
+    }
+
+    /**
+     * Appends a line to the console output.
+     *
+     * @param {String} content
+     * @param {String} color tailwind color name
+     * @memberof SocketsViewController
+     */
+    logEvent(content, color) {
+        // Reassigned rather than mutated so the tracked property invalidates.
+        this.events = [...this.events, { time: format(new Date(), this.consoleDateFormat), content, color }];
+    }
+
+    /**
+     * Describes a refused subscription. Authorization refusals from the socket
+     * server arrive as an `AuthError` with a short snake_case `reason`.
+     *
+     * @param {String} channelName
+     * @param {Error} error
+     * @return {String}
+     * @memberof SocketsViewController
+     */
+    describeSubscribeFailure(channelName, error) {
+        if (error && error.name === 'AuthError') {
+            return this.intl.t('developers.sockets.view.socket-subscribe-denied', { modelName: channelName, reason: error.reason || error.message });
+        }
+
+        return this.intl.t('developers.sockets.view.socket-subscribe-failed', { modelName: channelName, message: error ? error.message : '' });
+    }
+
     /**
      * Opens socket and logs all incoming events.
      *
@@ -56,12 +104,7 @@ export default class SocketsViewController extends BaseController {
         (async () => {
             // eslint-disable-next-line no-unused-vars
             for await (let event of socket.listener('error')) {
-                // Push an event or notification for socket connection here
-                this.events.pushObject({
-                    time: format(new Date(), this.consoleDateFormat),
-                    content: this.intl.t('developers.sockets.view.socket-connection-error'),
-                    color: 'red',
-                });
+                this.logEvent(this.intl.t('developers.sockets.view.socket-connection-error'), 'red');
             }
         })();
 
@@ -69,39 +112,44 @@ export default class SocketsViewController extends BaseController {
         (async () => {
             // eslint-disable-next-line no-unused-vars
             for await (let event of socket.listener('connect')) {
-                // Push an event or notification for socket connection here
-                this.events.pushObject({
-                    time: format(new Date(), this.consoleDateFormat),
-                    content: this.intl.t('developers.sockets.view.socket-connected'),
-                    color: 'green',
-                });
+                this.logEvent(this.intl.t('developers.sockets.view.socket-connected'), 'green');
             }
         })();
 
-        // Listed on company channel
+        // Subscribe to the channel
         const channel = socket.subscribe(model.name);
 
         // Listen for channel subscription
         (async () => {
             // eslint-disable-next-line no-unused-vars
             for await (let event of channel.listener('subscribe')) {
-                // Push an event or notification for channel subscription here
-                this.events.pushObject({
-                    time: format(new Date(), this.consoleDateFormat),
-                    content: this.intl.t('developers.sockets.view.socket-subscribed', { modelName: model.name }),
-                    color: 'blue',
-                });
+                this.subscriptionFailed = false;
+                this.logEvent(this.intl.t('developers.sockets.view.socket-subscribed', { modelName: model.name }), 'blue');
             }
         })();
 
-        // Listen for channel subscription
+        // Listen for a refused subscription, e.g. a channel this user is not
+        // authorized to see. Without this the page would wait silently forever.
+        (async () => {
+            for await (let { error } of channel.listener('subscribeFail')) {
+                this.subscriptionFailed = true;
+                this.logEvent(this.describeSubscribeFailure(model.name, error), 'red');
+            }
+        })();
+
+        // Listen for the server removing the subscription (for example when the
+        // socket token expired). The socket service resubscribes when it can, and
+        // the subscribe listener above logs that.
+        (async () => {
+            for await (let { message } of channel.listener('kickOut')) {
+                this.logEvent(this.intl.t('developers.sockets.view.socket-kicked-out', { modelName: model.name, reason: message }), 'red');
+            }
+        })();
+
+        // Listen for channel data
         (async () => {
             for await (let data of channel) {
-                this.events.pushObject({
-                    time: format(new Date(), this.consoleDateFormat),
-                    content: JSON.stringify(data, undefined, 2),
-                    color: 'green',
-                });
+                this.logEvent(JSON.stringify(data, undefined, 2), 'green');
             }
         })();
 
@@ -109,6 +157,7 @@ export default class SocketsViewController extends BaseController {
         this.hostRouter.on('routeWillChange', () => {
             channel.close();
             this.events = [];
+            this.subscriptionFailed = false;
         });
     }
 }
diff --git a/addon/templates/sockets/view.hbs b/addon/templates/sockets/view.hbs
index 86ebc5e..2d06057 100644
--- a/addon/templates/sockets/view.hbs
+++ b/addon/templates/sockets/view.hbs
@@ -20,7 +20,7 @@
                         <div class="block w-1/2 font-mono font-semibold text-green-300">
                             {{t "developers.sockets.view.output"}}
                         </div>
-                        {{#if this.events.length}}
+                        {{#if this.isAwaitingEvents}}
                             <div class="flex items-center justify-end w-1/2 text-sm text-green-300">
                                 <Spinner @iconClass="green-loader" />
 
@@ -37,9 +37,7 @@
                                 <div class="text-{{event.color}}-300 uppercase text-sm font-mono pr-2 flex-shrink-0">
                                     [{{event.time}}]:
                                 </div>
-                                <div class="text-{{event.color}}-300 text-sm font-mono">
-                                    {{html-safe event.content}}
-                                </div>
+                                <div class="text-{{event.color}}-300 text-sm font-mono whitespace-pre-wrap break-all">{{event.content}}</div>
                             </div>
                         {{else}}
                             <div class="flex items-center mt-6 text-green-300">
diff --git a/tests/unit/controllers/sockets/view-test.js b/tests/unit/controllers/sockets/view-test.js
index de0da6a..a91539d 100644
--- a/tests/unit/controllers/sockets/view-test.js
+++ b/tests/unit/controllers/sockets/view-test.js
@@ -1,12 +1,195 @@
 import { module, test } from 'qunit';
 import { setupTest } from 'dummy/tests/helpers';
 
+class IntlStub {
+    t(key, params) {
+        return params ? `${key} ${JSON.stringify(params)}` : key;
+    }
+}
+
+class HostRouterStub {
+    handlers = {};
+
+    on(eventName, handler) {
+        this.handlers[eventName] = handler;
+    }
+}
+
+class EmptyServiceStub {}
+
+// An async-iterable event stream a test can push into.
+function eventStream() {
+    const queue = [];
+    const waiting = [];
+
+    return {
+        push(value) {
+            if (waiting.length) {
+                waiting.shift()({ done: false, value });
+            } else {
+                queue.push(value);
+            }
+        },
+        close() {
+            while (waiting.length) {
+                waiting.shift()({ done: true, value: undefined });
+            }
+        },
+        [Symbol.asyncIterator]() {
+            return {
+                next: () => (queue.length ? Promise.resolve({ done: false, value: queue.shift() }) : new Promise((resolve) => waiting.push(resolve))),
+            };
+        },
+    };
+}
+
+function fakeChannel() {
+    const listeners = {};
+    const data = eventStream();
+
+    return {
+        closed: false,
+        listener(eventName) {
+            listeners[eventName] = listeners[eventName] || eventStream();
+            return listeners[eventName];
+        },
+        emit(eventName, value) {
+            this.listener(eventName).push(value);
+        },
+        publish(value) {
+            data.push(value);
+        },
+        close() {
+            this.closed = true;
+            Object.values(listeners).forEach((stream) => stream.close());
+            data.close();
+        },
+        [Symbol.asyncIterator]() {
+            return data[Symbol.asyncIterator]();
+        },
+    };
+}
+
+// Stands in for the ember-core socket service: `instance()` returns a client
+// whose subscribe hands back the test's channel.
+class SocketStub {
+    channel = null;
+    subscribed = [];
+    clientListeners = {};
+
+    instance() {
+        return {
+            listener: (eventName) => {
+                this.clientListeners[eventName] = this.clientListeners[eventName] || eventStream();
+                return this.clientListeners[eventName];
+            },
+            subscribe: (name) => {
+                this.subscribed.push(name);
+                return this.channel;
+            },
+        };
+    }
+}
+
+function authError(reason) {
+    const error = new Error(`Subscription to channel denied: ${reason}`);
+    error.name = 'AuthError';
+    error.reason = reason;
+    return error;
+}
+
+const flush = () => new Promise((resolve) => setTimeout(resolve, 0));
+
 module('Unit | Controller | sockets/view', function (hooks) {
     setupTest(hooks);
 
-    // TODO: Replace this with your real tests.
+    hooks.beforeEach(function () {
+        this.owner.register('service:intl', IntlStub);
+        this.owner.register('service:host-router', HostRouterStub);
+        this.owner.register('service:socket', SocketStub);
+        this.owner.register('service:universe', EmptyServiceStub);
+
+        this.controller = this.owner.lookup('controller:sockets/view');
+        this.channel = fakeChannel();
+        this.socket = this.owner.lookup('service:socket');
+        this.socket.channel = this.channel;
+    });
+
     test('it exists', function (assert) {
-        let controller = this.owner.lookup('controller:sockets/view');
-        assert.ok(controller);
+        assert.ok(this.controller);
+    });
+
+    test('an authorization refusal is shown with its reason', function (assert) {
+        const message = this.controller.describeSubscribeFailure('order.abc', authError('forbidden'));
+
+        assert.true(message.startsWith('developers.sockets.view.socket-subscribe-denied'));
+        assert.true(message.includes('"reason":"forbidden"'));
+    });
+
+    test('an authorization refusal without a reason falls back to the message', function (assert) {
+        const error = authError(undefined);
+        const message = this.controller.describeSubscribeFailure('order.abc', error);
+
+        assert.true(message.includes(JSON.stringify(error.message).slice(1, -1)));
+    });
+
+    test('any other refusal is shown with its message', function (assert) {
+        const message = this.controller.describeSubscribeFailure('order.abc', new Error('Socket hung up'));
+
+        assert.true(message.startsWith('developers.sockets.view.socket-subscribe-failed'));
+        assert.true(message.includes('Socket hung up'));
+        assert.true(this.controller.describeSubscribeFailure('order.abc', null).startsWith('developers.sockets.view.socket-subscribe-failed'));
+    });
+
+    test('a refused subscription is logged and stops the awaiting indicator', async function (assert) {
+        this.controller.watchSocket({ name: 'order.abc' });
+        assert.deepEqual(this.socket.subscribed, ['order.abc']);
+
+        this.channel.emit('subscribeFail', { error: authError('forbidden') });
+        await flush();
+
+        assert.true(this.controller.subscriptionFailed);
+        assert.false(this.controller.isAwaitingEvents);
+        assert.strictEqual(this.controller.events.length, 1);
+        assert.strictEqual(this.controller.events[0].color, 'red');
+        assert.true(this.controller.events[0].content.startsWith('developers.sockets.view.socket-subscribe-denied'));
+    });
+
+    test('a kick-out is logged and a later resubscribe clears the failure', async function (assert) {
+        this.controller.watchSocket({ name: 'order.abc' });
+
+        this.channel.emit('subscribeFail', { error: authError('token_expired') });
+        this.channel.emit('kickOut', { message: 'token_expired' });
+        await flush();
+        this.channel.emit('subscribe', {});
+        await flush();
+
+        assert.false(this.controller.subscriptionFailed);
+        assert.true(this.controller.isAwaitingEvents);
+        assert.deepEqual(
+            this.controller.events.map((event) => event.content.split(' ')[0]),
+            ['developers.sockets.view.socket-subscribe-denied', 'developers.sockets.view.socket-kicked-out', 'developers.sockets.view.socket-subscribed']
+        );
+    });
+
+    test('channel data is logged as JSON', async function (assert) {
+        this.controller.watchSocket({ name: 'order.abc' });
+
+        this.channel.publish({ event: 'order.updated' });
+        await flush();
+
+        assert.strictEqual(this.controller.events[0].content, JSON.stringify({ event: 'order.updated' }, undefined, 2));
+    });
+
+    test('leaving the page closes the channel and resets the output', async function (assert) {
+        this.controller.watchSocket({ name: 'order.abc' });
+        this.channel.emit('subscribeFail', { error: authError('forbidden') });
+        await flush();
+
+        this.owner.lookup('service:host-router').handlers.routeWillChange();
+
+        assert.true(this.channel.closed);
+        assert.deepEqual(this.controller.events, []);
+        assert.false(this.controller.subscriptionFailed);
     });
 });
diff --git a/translations/ar-ae.yaml b/translations/ar-ae.yaml
index 2f15983..1d12158 100644
--- a/translations/ar-ae.yaml
+++ b/translations/ar-ae.yaml
@@ -252,6 +252,9 @@ developers:
       socket-connection-error: خطأ في اتصال المقبس!
       socket-connected: المقبس متصل
       socket-subscribed: المقبس مشترك في القناة {modelName}
+      socket-subscribe-denied: غير مصرح بالاشتراك في القناة {modelName} ({reason})
+      socket-subscribe-failed: "تعذر الاشتراك في القناة {modelName}: {message}"
+      socket-kicked-out: تمت الإزالة من القناة {modelName} ({reason})
       output: الإخراج
       awaiting-events: في انتظار الأحداث...
   webhooks:
diff --git a/translations/bg-bg.yaml b/translations/bg-bg.yaml
index 84db0bf..cd51973 100644
--- a/translations/bg-bg.yaml
+++ b/translations/bg-bg.yaml
@@ -264,6 +264,9 @@ developers:
       socket-connection-error: Грешка при свързване на сокет!
       socket-connected: Сокетът е свързан
       socket-subscribed: Сокетът е абониран за канал {modelName}
+      socket-subscribe-denied: Няма разрешение за абониране за канал {modelName} ({reason})
+      socket-subscribe-failed: "Неуспешно абониране за канал {modelName}: {message}"
+      socket-kicked-out: Премахнат от канал {modelName} ({reason})
       output: Изход
       awaiting-events: Очакване на събития...
   webhooks:
diff --git a/translations/en-us.yaml b/translations/en-us.yaml
index 505aed4..6027255 100644
--- a/translations/en-us.yaml
+++ b/translations/en-us.yaml
@@ -240,6 +240,9 @@ developers:
       socket-connection-error: Socket connection error!
       socket-connected: Socket is connected
       socket-subscribed: Socket subscribed to channel {modelName}
+      socket-subscribe-denied: Not authorized to subscribe to channel {modelName} ({reason})
+      socket-subscribe-failed: "Could not subscribe to channel {modelName}: {message}"
+      socket-kicked-out: Removed from channel {modelName} ({reason})
       output: Output
       awaiting-events: Awaiting events...
   webhooks:
diff --git a/translations/es-es.yaml b/translations/es-es.yaml
index d1bf532..c6861f5 100644
--- a/translations/es-es.yaml
+++ b/translations/es-es.yaml
@@ -266,6 +266,9 @@ developers:
       socket-connection-error: ¡Error de conexión de socket!
       socket-connected: Socket conectado
       socket-subscribed: Socket suscrito al canal {modelName}
+      socket-subscribe-denied: No autorizado para suscribirse al canal {modelName} ({reason})
+      socket-subscribe-failed: "No se pudo suscribir al canal {modelName}: {message}"
+      socket-kicked-out: Eliminado del canal {modelName} ({reason})
       output: Salida
       awaiting-events: Esperando eventos...
   webhooks:
diff --git a/translations/fr-fr.yaml b/translations/fr-fr.yaml
index 3715803..f72e0f5 100644
--- a/translations/fr-fr.yaml
+++ b/translations/fr-fr.yaml
@@ -266,6 +266,9 @@ developers:
       socket-connection-error: Erreur de connexion socket !
       socket-connected: Socket connecté
       socket-subscribed: Socket abonné au canal {modelName}
+      socket-subscribe-denied: "Non autorisé à s'abonner au canal {modelName} ({reason})"
+      socket-subscribe-failed: "Impossible de s'abonner au canal {modelName} : {message}"
+      socket-kicked-out: Retiré du canal {modelName} ({reason})
       output: Sortie
       awaiting-events: En attente d'événements...
   webhooks:
diff --git a/translations/mn-mn.yaml b/translations/mn-mn.yaml
index 31ef24c..80c39d0 100644
--- a/translations/mn-mn.yaml
+++ b/translations/mn-mn.yaml
@@ -259,6 +259,9 @@ developers:
       socket-connection-error: Сокет холболтын алдаа!
       socket-connected: Сокет холбогдсон байна
       socket-subscribed: Сокет {modelName} сувгад захиалсан байна
+      socket-subscribe-denied: "{modelName} сувагт захиалах эрхгүй ({reason})"
+      socket-subscribe-failed: "{modelName} сувагт захиалж чадсангүй: {message}"
+      socket-kicked-out: "{modelName} сувгаас хасагдсан ({reason})"
       output: Гаралт
       awaiting-events: Үйл явдлуудыг хүлээж байна...
   webhooks:
diff --git a/translations/pt-br.yaml b/translations/pt-br.yaml
index c9a50c0..10c4856 100644
--- a/translations/pt-br.yaml
+++ b/translations/pt-br.yaml
@@ -261,6 +261,9 @@ developers:
       socket-connection-error: Erro na conexão do socket!
       socket-connected: Socket está conectado
       socket-subscribed: Socket inscrito no canal {modelName}
+      socket-subscribe-denied: Sem autorização para se inscrever no canal {modelName} ({reason})
+      socket-subscribe-failed: "Não foi possível se inscrever no canal {modelName}: {message}"
+      socket-kicked-out: Removido do canal {modelName} ({reason})
       output: Saída
       awaiting-events: Aguardando eventos...
   webhooks:
diff --git a/translations/ru-ru.yaml b/translations/ru-ru.yaml
index 7832d35..e22bc3e 100644
--- a/translations/ru-ru.yaml
+++ b/translations/ru-ru.yaml
@@ -258,6 +258,9 @@ developers:
       socket-connection-error: Ошибка подключения сокета!
       socket-connected: Сокет подключен
       socket-subscribed: Сокет подписан на канал {modelName}
+      socket-subscribe-denied: Нет прав на подписку на канал {modelName} ({reason})
+      socket-subscribe-failed: "Не удалось подписаться на канал {modelName}: {message}"
+      socket-kicked-out: Удалён из канала {modelName} ({reason})
       output: Вывод
       awaiting-events: Ожидание событий...
   webhooks:
diff --git a/translations/uk-ua.yaml b/translations/uk-ua.yaml
index 7e7177d..62d5093 100644
--- a/translations/uk-ua.yaml
+++ b/translations/uk-ua.yaml
@@ -240,6 +240,9 @@ developers:
       socket-connection-error: Помилка підключення до сокета!
       socket-connected: Сокет підключено
       socket-subscribed: Сокет підписано на канал {modelName}
+      socket-subscribe-denied: Немає дозволу на підписку на канал {modelName} ({reason})
+      socket-subscribe-failed: "Не вдалося підписатися на канал {modelName}: {message}"
+      socket-kicked-out: Видалено з каналу {modelName} ({reason})
       output: Вивід
       awaiting-events: Очікування подій...
   webhooks:
diff --git a/translations/vi-vn.yaml b/translations/vi-vn.yaml
index 2cbbdf5..72feb60 100644
--- a/translations/vi-vn.yaml
+++ b/translations/vi-vn.yaml
@@ -258,6 +258,9 @@ developers:
       socket-connection-error: Lỗi kết nối Socket!
       socket-connected: Socket đã kết nối
       socket-subscribed: Socket đã đăng ký kênh {modelName}
+      socket-subscribe-denied: Không được phép đăng ký kênh {modelName} ({reason})
+      socket-subscribe-failed: "Không thể đăng ký kênh {modelName}: {message}"
+      socket-kicked-out: Đã bị xóa khỏi kênh {modelName} ({reason})
       output: Đầu ra
       awaiting-events: Đang chờ sự kiện...
   webhooks:
diff --git a/translations/zh-cn.yaml b/translations/zh-cn.yaml
index d6f5944..7ff3cfc 100644
--- a/translations/zh-cn.yaml
+++ b/translations/zh-cn.yaml
@@ -240,6 +240,9 @@ developers:
       socket-connection-error: Socket 连接错误！
       socket-connected: Socket 已连接
       socket-subscribed: Socket 已订阅频道 {modelName}
+      socket-subscribe-denied: 无权订阅频道 {modelName}（{reason}）
+      socket-subscribe-failed: 无法订阅频道 {modelName}：{message}
+      socket-kicked-out: 已被移出频道 {modelName}（{reason}）
       output: 输出
       awaiting-events: 等待事件中...
   webhooks: