diff --git a/public/index.html b/public/index.html
index e3e87e6..b4d6f75 100644
--- a/public/index.html
+++ b/public/index.html
@@ -56,6 +56,16 @@
               <p>Statut synchronise toutes les 5 minutes.</p>
             </div>
           </div>
+          <div class="info-banner">
+            <div>
+              <strong>Capacite limitee</strong>
+              <p>Un seul serveur de jeux peut etre lance a la fois afin d'eviter de surcharger le serveur.</p>
+            </div>
+            <div>
+              <strong>Arret automatique</strong>
+              <p>Les serveurs de jeux se ferment automatiquement si aucun joueur n'est present pendant 1 h.</p>
+            </div>
+          </div>
           <div class="server-grid" id="serversBody"></div>
         </section>
 
diff --git a/public/styles/app.css b/public/styles/app.css
index 46a5b82..1dc9dfa 100644
--- a/public/styles/app.css
+++ b/public/styles/app.css
@@ -253,6 +253,36 @@ button {
   margin-bottom: 1.2rem;
 }
 
+.info-banner {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 0.85rem;
+  margin: -0.25rem 0 1rem;
+}
+
+.info-banner > div {
+  background: linear-gradient(135deg, rgba(123, 92, 255, 0.14), rgba(0, 132, 255, 0.08));
+  border: 1px solid rgba(123, 92, 255, 0.28);
+  border-radius: 7px;
+  padding: 0.85rem 0.95rem;
+}
+
+.info-banner strong {
+  display: block;
+  color: var(--text);
+  font-family: var(--font-display);
+  font-size: 0.76rem;
+  letter-spacing: 0.1em;
+  margin-bottom: 0.38rem;
+  text-transform: uppercase;
+}
+
+.info-banner p {
+  color: var(--muted);
+  font-size: 0.9rem;
+  margin: 0;
+}
+
 h2,
 h3 {
   margin: 0;
@@ -704,6 +734,10 @@ code {
     max-width: none;
   }
 
+  .info-banner {
+    grid-template-columns: 1fr;
+  }
+
   .inline-form {
     width: 100%;
   }
diff --git a/src/routes/servers.js b/src/routes/servers.js
index 5c1543d..93a3003 100644
--- a/src/routes/servers.js
+++ b/src/routes/servers.js
@@ -5,10 +5,17 @@ import { mergeServersWithStatus } from "../services/status.js";
 import { getStartProfile, launchServer } from "../services/serverLauncher.js";
 
 const router = express.Router();
+let launchInProgress = false;
 
 router.get("/servers", (req, res) => {
-  const servers = visibleServers(req.group);
-  return res.json({ servers: servers.map((server) => serializeServerForGroup(server, req.group)) });
+  const allServers = serversWithImages();
+  const anyServerActive = allServers.some((server) => server.active);
+  const servers = allServers.filter((server) => canAccessServer(req.group, server.id));
+  return res.json({
+    servers: servers.map((server) =>
+      serializeServerForGroup(server, req.group, { anyServerActive })
+    ),
+  });
 });
 
 router.post("/servers/:serverId/start", async (req, res) => {
@@ -23,10 +30,20 @@ router.post("/servers/:serverId/start", async (req, res) => {
     return res.status(409).json({ error: "Le serveur est deja en ligne" });
   }
 
+  if (servers.some((entry) => entry.active)) {
+    return res.status(409).json({ error: "Un serveur est deja en cours" });
+  }
+
+  if (launchInProgress) {
+    return res.status(409).json({ error: "Un lancement est deja en cours" });
+  }
+
   if (!getStartProfile(server)) {
     return res.status(400).json({ error: "Aucun profil de lancement configure" });
   }
 
+  launchInProgress = true;
+
   try {
     const { stdout, stderr } = await launchServer(server);
 
@@ -40,24 +57,24 @@ router.post("/servers/:serverId/start", async (req, res) => {
 
     return res.json({
       status: "started",
-      server: serializeServerForGroup(server, req.group),
+      server: serializeServerForGroup(server, req.group, { anyServerActive: true }),
       stdout: stdout?.trim() || "",
       stderr: stderr?.trim() || "",
     });
   } catch (error) {
     console.error(`[servers] Failed to start ${server.id}:`, error);
     return res.status(500).json({ error: "Impossible de lancer le serveur" });
+  } finally {
+    launchInProgress = false;
   }
 });
 
-function visibleServers(group) {
+function serversWithImages() {
   const images = readServerImages();
-  return mergeServersWithStatus(readServers())
-    .map((server) => ({
-      ...server,
-      heroImage: images[server.id]?.url || null,
-    }))
-    .filter((server) => canAccessServer(group, server.id));
+  return mergeServersWithStatus(readServers()).map((server) => ({
+    ...server,
+    heroImage: images[server.id]?.url || null,
+  }));
 }
 
 export { router as serversRouter };
diff --git a/src/services/permissions.js b/src/services/permissions.js
index 934915c..999d0d9 100644
--- a/src/services/permissions.js
+++ b/src/services/permissions.js
@@ -48,7 +48,7 @@ function getPublicSecrets(secrets = {}) {
   );
 }
 
-function serializeServerForGroup(server, group) {
+function serializeServerForGroup(server, group, { anyServerActive = false } = {}) {
   const publicSecrets = getPublicSecrets(server.secrets);
   const startProfile = getStartProfile(server);
   const serialized = {
@@ -58,7 +58,8 @@ function serializeServerForGroup(server, group) {
     port: server.port,
     heroImage: server.heroImage || null,
     active: Boolean(server.active),
-    canStart: canAccessServer(group, server.id) && !server.active && Boolean(startProfile),
+    canStart:
+      canAccessServer(group, server.id) && !server.active && !anyServerActive && Boolean(startProfile),
     hasSecrets: Object.keys(publicSecrets).length > 0,
   };
 
diff --git a/test/api.test.js b/test/api.test.js
index ea4e134..8635815 100644
--- a/test/api.test.js
+++ b/test/api.test.js
@@ -125,6 +125,7 @@ test("filters servers and shows secrets for visible non-admin servers", async ()
   assert.equal(response.body.servers[0].id, "offline-server");
   assert.equal(response.body.servers[0].secrets.password, "secret-1");
   assert.equal(response.body.servers[0].hasSecrets, true);
+  assert.equal(response.body.servers[0].canStart, false);
 });
 
 test("admin sees all servers and secrets", async () => {
@@ -179,20 +180,50 @@ test("status file is authoritative for server list and names", async () => {
 });
 
 test("starts an offline authorized server and writes a log", async () => {
-  const token = await login(playerPassword);
-  const start = await request("/api/servers/offline-server/start", {
-    method: "POST",
-    token,
-  });
+  try {
+    fs.writeFileSync(
+      process.env.GAMESERVERS_STATUS_FILE,
+      `${JSON.stringify(
+        {
+          servers: [
+            {
+              id: "offline-server",
+              game: "Offline Server",
+              address: "games.example:1111",
+              port: 1111,
+              active: false,
+            },
+            {
+              id: "online-server",
+              game: "Online Server",
+              address: "games.example:2222",
+              port: 2222,
+              active: false,
+            },
+          ],
+        },
+        null,
+        2
+      )}\n`
+    );
 
-  assert.equal(start.status, 200);
-  assert.equal(start.body.status, "started");
+    const token = await login(playerPassword);
+    const start = await request("/api/servers/offline-server/start", {
+      method: "POST",
+      token,
+    });
 
-  const adminToken = await login(adminLoginPassword);
-  const logs = await request("/api/logs", { token: adminToken });
-  assert.equal(logs.status, 200);
-  assert.equal(logs.body.logs[0].groupId, "players");
-  assert.equal(logs.body.logs[0].serverId, "offline-server");
+    assert.equal(start.status, 200);
+    assert.equal(start.body.status, "started");
+
+    const adminToken = await login(adminLoginPassword);
+    const logs = await request("/api/logs", { token: adminToken });
+    assert.equal(logs.status, 200);
+    assert.equal(logs.body.logs[0].groupId, "players");
+    assert.equal(logs.body.logs[0].serverId, "offline-server");
+  } finally {
+    fs.writeFileSync(process.env.GAMESERVERS_STATUS_FILE, originalStatus);
+  }
 });
 
 test("refuses to start online or unauthorized servers", async () => {
@@ -204,6 +235,13 @@ test("refuses to start online or unauthorized servers", async () => {
   assert.equal(unauthorized.status, 404);
 
   const adminToken = await login(adminLoginPassword);
+  const blockedByActiveServer = await request("/api/servers/offline-server/start", {
+    method: "POST",
+    token: adminToken,
+  });
+  assert.equal(blockedByActiveServer.status, 409);
+  assert.equal(blockedByActiveServer.body.error, "Un serveur est deja en cours");
+
   const online = await request("/api/servers/online-server/start", {
     method: "POST",
     token: adminToken,