diff --git a/desktop/flipper-server-core/src/app-connectivity/ServerRSocket.tsx b/desktop/flipper-server-core/src/app-connectivity/ServerRSocket.tsx
index 59db23943b5..84515b68d88 100644
--- a/desktop/flipper-server-core/src/app-connectivity/ServerRSocket.tsx
+++ b/desktop/flipper-server-core/src/app-connectivity/ServerRSocket.tsx
@@ -47,37 +47,41 @@ class ServerRSocket extends ServerWebSocketBase {
   start(port: number, sslConfig?: SecureServerConfig): Promise<number> {
     const self = this;
     return new Promise((resolve, reject) => {
-      // eslint-disable-next-line prefer-const
-      let rawServer: RSocketServer<any, any> | undefined;
-      const serverFactory = (onConnect: (socket: Socket) => void) => {
-        const transportServer = sslConfig
-          ? tls.createServer(sslConfig, (socket) => {
-              onConnect(socket);
-            })
-          : net.createServer(onConnect);
-        transportServer.on('error', reject).on('listening', () => {
-          console.debug(
-            `${
-              sslConfig ? 'Secure' : 'Certificate'
-            } server started on port ${port}`,
-            'server',
-          );
-          self.listener.onListening(port);
-          self.rawServer_ = rawServer;
-          resolve((transportServer.address() as AddressInfo).port);
+      try {
+        // eslint-disable-next-line prefer-const
+        let rawServer: RSocketServer<any, any> | undefined;
+        const serverFactory = (onConnect: (socket: Socket) => void) => {
+          const transportServer = sslConfig
+            ? tls.createServer(sslConfig, (socket) => {
+                onConnect(socket);
+              })
+            : net.createServer(onConnect);
+          transportServer.on('error', reject).on('listening', () => {
+            console.debug(
+              `${
+                sslConfig ? 'Secure' : 'Certificate'
+              } server started on port ${port}`,
+              'server',
+            );
+            self.listener.onListening(port);
+            self.rawServer_ = rawServer;
+            resolve((transportServer.address() as AddressInfo).port);
+          });
+          return transportServer;
+        };
+        rawServer = new RSocketServer({
+          getRequestHandler: sslConfig
+            ? this._trustedRequestHandler
+            : this._untrustedRequestHandler,
+          transport: new RSocketTCPServer({
+            port: port,
+            serverFactory: serverFactory,
+          }),
         });
-        return transportServer;
-      };
-      rawServer = new RSocketServer({
-        getRequestHandler: sslConfig
-          ? this._trustedRequestHandler
-          : this._untrustedRequestHandler,
-        transport: new RSocketTCPServer({
-          port: port,
-          serverFactory: serverFactory,
-        }),
-      });
-      rawServer.start();
+        rawServer.start();
+      } catch (e) {
+        reject(e);
+      }
     });
   }
 
diff --git a/desktop/flipper-server-core/src/app-connectivity/ServerWebSocket.tsx b/desktop/flipper-server-core/src/app-connectivity/ServerWebSocket.tsx
index b380ff97abe..0e882e26d15 100644
--- a/desktop/flipper-server-core/src/app-connectivity/ServerWebSocket.tsx
+++ b/desktop/flipper-server-core/src/app-connectivity/ServerWebSocket.tsx
@@ -49,46 +49,50 @@ class ServerWebSocket extends ServerWebSocketBase {
 
   async start(port: number, sslConfig?: SecureServerConfig): Promise<number> {
     const assignedPort = await new Promise<number>((resolve, reject) => {
-      const server = sslConfig
-        ? createHttpsServer(sslConfig)
-        : createHttpServer();
-
-      const wsServer = new WSServer({
-        server,
-        verifyClient: this.verifyClient(),
-        maxPayload: WEBSOCKET_MAX_MESSAGE_SIZE,
-      });
-
-      // We do not need to listen to http server's `error` because it is propagated to WS
-      // https://github.com/websockets/ws/blob/a3a22e4ed39c1a3be8e727e9c630dd440edc61dd/lib/websocket-server.js#L109
-      const onConnectionError = (error: Error) => {
-        reject(
-          new Error(
-            `Unable to start server at port ${port} due to ${JSON.stringify(
-              serializeError(error),
-            )}`,
-          ),
-        );
-      };
-      wsServer.once('error', onConnectionError);
-      server.listen(port, () => {
-        console.debug(
-          `[ws] ${
-            sslConfig ? 'Secure' : 'Insecure'
-          } server started on port ${port}`,
-          'server',
-        );
-
-        // Unsubscribe connection error listener.
-        // We'll attach a permanent error listener later.
-        wsServer.off('error', onConnectionError);
-
-        this.listener.onListening(port);
-        this.wsServer = wsServer;
-        this.httpServer = server;
+      try {
+        const server = sslConfig
+          ? createHttpsServer(sslConfig)
+          : createHttpServer();
+
+        const wsServer = new WSServer({
+          server,
+          verifyClient: this.verifyClient(),
+          maxPayload: WEBSOCKET_MAX_MESSAGE_SIZE,
+        });
 
-        resolve((server.address() as AddressInfo).port);
-      });
+        // We do not need to listen to http server's `error` because it is propagated to WS
+        // https://github.com/websockets/ws/blob/a3a22e4ed39c1a3be8e727e9c630dd440edc61dd/lib/websocket-server.js#L109
+        const onConnectionError = (error: Error) => {
+          reject(
+            new Error(
+              `Unable to start server at port ${port} due to ${JSON.stringify(
+                serializeError(error),
+              )}`,
+            ),
+          );
+        };
+        wsServer.once('error', onConnectionError);
+        server.listen(port, () => {
+          console.debug(
+            `[ws] ${
+              sslConfig ? 'Secure' : 'Insecure'
+            } server started on port ${port}`,
+            'server',
+          );
+
+          // Unsubscribe connection error listener.
+          // We'll attach a permanent error listener later.
+          wsServer.off('error', onConnectionError);
+
+          this.listener.onListening(port);
+          this.wsServer = wsServer;
+          this.httpServer = server;
+
+          resolve((server.address() as AddressInfo).port);
+        });
+      } catch (e) {
+        reject(e);
+      }
     });
 
     assertNotNull(this.wsServer);