diff --git a/client/src/client.vala b/client/src/client.vala
index e383616..35a552d 100644
--- a/client/src/client.vala
+++ b/client/src/client.vala
@@ -5,10 +5,14 @@ namespace StudySystemClient {
 	}
 
 	public class Client {
+		public signal void connection_status(bool connected);
+
 		private Connection connection;
 
 		public Client(string cert_dir) throws Error {
-			connection = new Connection(cert_dir);
+			connection = new Connection(cert_dir, (connected) => {
+					connection_status(connected);
+				});
 		}
 
 		public async void ping() throws ClientError {
diff --git a/client/src/connection.vala b/client/src/connection.vala
index 1102dea..4e57af1 100644
--- a/client/src/connection.vala
+++ b/client/src/connection.vala
@@ -1,15 +1,22 @@
 namespace StudySystemClient {
 	public class Connection {
+		public delegate void StatusCallback(bool connected);
+
+		private StatusCallback status_callback;
 		private SessionManager session_manager;
 		private TransactionManager transaction_manager;
 		private Worker worker;
 
-		public Connection(string cert_dir) throws Error {
+		public Connection(string cert_dir,
+						  owned StatusCallback status_callback)
+		throws Error {
 			var loopback = new InetAddress.loopback(SocketFamily.IPV6);
 			var session_factory
 				= new SessionFactory(loopback, 12888, cert_dir);
+			this.status_callback = (owned) status_callback;
 			session_manager = new SessionManager(
-				session_factory, (msg) => receive(msg));
+				session_factory, (msg) => receive(msg),
+				(connected) => status_changed(connected));
 			transaction_manager = new TransactionManager();
 			worker = new Worker(session_manager);
 		}
@@ -35,6 +42,13 @@ namespace StudySystemClient {
 					return false;
 				}, GLib.Priority.DEFAULT_IDLE);
 		}
+
+		private void status_changed(bool connected) {
+			Idle.add(() => {
+					status_callback(connected);
+					return false;
+				}, GLib.Priority.DEFAULT_IDLE);
+		}
 	}
 
 	private class Continuation {
diff --git a/client/src/session_manager.vala b/client/src/session_manager.vala
index 61807d7..ac8dd04 100644
--- a/client/src/session_manager.vala
+++ b/client/src/session_manager.vala
@@ -8,14 +8,18 @@ namespace StudySystemClient {
 
 		private SessionFactory session_factory;
 		private ReceiveCallback receive_callback;
+		private Connection.StatusCallback status_callback;
 		private Session? session;
 		private AsyncQueue<OutgoingMessage> queue;
 		private uint reconnect_wait_ms;
 
-		public SessionManager(SessionFactory session_factory,
-							  owned ReceiveCallback receive_callback) {
+		public SessionManager(
+			SessionFactory session_factory,
+			owned ReceiveCallback receive_callback,
+			owned Connection.StatusCallback status_callback) {
 			this.session_factory = session_factory;
 			this.receive_callback = (owned) receive_callback;
+			this.status_callback = (owned) status_callback;
 			this.session = null;
 			queue = new AsyncQueue<OutgoingMessage>();
 			reconnect_wait_ms = INIT_RECONNECT_WAIT_MS;
@@ -40,6 +44,7 @@ namespace StudySystemClient {
 			if (msg.should_retry())
 				queue.push(msg);
 			session = null;
+			status_callback(false);
 		}
 
 		private void try_start_session() {
@@ -47,7 +52,9 @@ namespace StudySystemClient {
 				session = session_factory.start_session();
 				session.received.connect((msg) => receive_callback(msg));
 				reconnect_wait_ms = INIT_RECONNECT_WAIT_MS;
+				status_callback(true);
 			} catch (Error _) {
+				status_callback(false);
 				Thread.usleep(1000 * reconnect_wait_ms);
 				update_reconnect_wait();
 			}