diff --git a/lib/tunnelbroker/tunnelbroker-context.js b/lib/tunnelbroker/tunnelbroker-context.js
index 0573ca19d..df679244b 100644
--- a/lib/tunnelbroker/tunnelbroker-context.js
+++ b/lib/tunnelbroker/tunnelbroker-context.js
@@ -1,447 +1,469 @@
 // @flow
 
 import invariant from 'invariant';
 import _isEqual from 'lodash/fp/isEqual.js';
 import * as React from 'react';
 import uuid from 'uuid';
 
 import type { SecondaryTunnelbrokerConnection } from './secondary-tunnelbroker-connection.js';
 import { tunnnelbrokerURL } from '../facts/tunnelbroker.js';
 import { peerToPeerMessageHandler } from '../handlers/peer-to-peer-message-handler.js';
 import { IdentityClientContext } from '../shared/identity-client-context.js';
 import { tunnelbrokerHeartbeatTimeout } from '../shared/timeouts.js';
 import { isWebPlatform } from '../types/device-types.js';
 import type { MessageReceiveConfirmation } from '../types/tunnelbroker/message-receive-confirmation-types.js';
 import type { MessageSentStatus } from '../types/tunnelbroker/message-to-device-request-status-types.js';
 import type { MessageToDeviceRequest } from '../types/tunnelbroker/message-to-device-request-types.js';
 import {
   type TunnelbrokerMessage,
   tunnelbrokerMessageTypes,
   tunnelbrokerMessageValidator,
 } from '../types/tunnelbroker/messages.js';
 import {
   type PeerToPeerMessage,
   peerToPeerMessageValidator,
 } from '../types/tunnelbroker/peer-to-peer-message-types.js';
 import type {
   AnonymousInitializationMessage,
   ConnectionInitializationMessage,
   TunnelbrokerInitializationMessage,
   TunnelbrokerDeviceTypes,
 } from '../types/tunnelbroker/session-types.js';
 import type { Heartbeat } from '../types/websocket/heartbeat-types.js';
 import { getConfig } from '../utils/config.js';
 import { getContentSigningKey } from '../utils/crypto-utils.js';
 import { useSelector } from '../utils/redux-utils.js';
 
 export type ClientMessageToDevice = {
   +deviceID: string,
   +payload: string,
 };
 
 export type TunnelbrokerSocketListener = (
   message: TunnelbrokerMessage,
 ) => mixed;
 
 type PromiseCallbacks = {
   +resolve: () => void,
   +reject: (error: string) => void,
 };
 type Promises = { [clientMessageID: string]: PromiseCallbacks };
 
 type TunnelbrokerContextType = {
   +sendMessage: (message: ClientMessageToDevice) => Promise<void>,
   +addListener: (listener: TunnelbrokerSocketListener) => void,
   +removeListener: (listener: TunnelbrokerSocketListener) => void,
   +connected: boolean,
   +isAuthorized: boolean,
   +setUnauthorizedDeviceID: (unauthorizedDeviceID: ?string) => void,
 };
 
 const TunnelbrokerContext: React.Context<?TunnelbrokerContextType> =
   React.createContext<?TunnelbrokerContextType>();
 
 type Props = {
   +children: React.Node,
   +shouldBeClosed?: boolean,
   +onClose?: () => mixed,
   +secondaryTunnelbrokerConnection?: SecondaryTunnelbrokerConnection,
 };
 
 function getTunnelbrokerDeviceType(): TunnelbrokerDeviceTypes {
   return isWebPlatform(getConfig().platformDetails.platform) ? 'web' : 'mobile';
 }
 
 function createAnonymousInitMessage(
   deviceID: string,
 ): AnonymousInitializationMessage {
   return ({
     type: 'AnonymousInitializationMessage',
     deviceID,
     deviceType: getTunnelbrokerDeviceType(),
   }: AnonymousInitializationMessage);
 }
 
 function TunnelbrokerProvider(props: Props): React.Node {
   const { children, shouldBeClosed, onClose, secondaryTunnelbrokerConnection } =
     props;
 
   const accessToken = useSelector(state => state.commServicesAccessToken);
   const userID = useSelector(state => state.currentUserInfo?.id);
 
   const [unauthorizedDeviceID, setUnauthorizedDeviceID] =
     React.useState<?string>(null);
   const isAuthorized = !unauthorizedDeviceID;
 
   const createInitMessage = React.useCallback(async () => {
     if (shouldBeClosed) {
       return null;
     }
 
     if (unauthorizedDeviceID) {
       return createAnonymousInitMessage(unauthorizedDeviceID);
     }
 
     if (!accessToken || !userID) {
       return null;
     }
 
     const deviceID = await getContentSigningKey();
     if (!deviceID) {
       return null;
     }
     return ({
       type: 'ConnectionInitializationMessage',
       deviceID,
       accessToken,
       userID,
       deviceType: getTunnelbrokerDeviceType(),
     }: ConnectionInitializationMessage);
   }, [accessToken, shouldBeClosed, unauthorizedDeviceID, userID]);
 
   const previousInitMessage =
     React.useRef<?TunnelbrokerInitializationMessage>(null);
 
   const [connected, setConnected] = React.useState(false);
   const listeners = React.useRef<Set<TunnelbrokerSocketListener>>(new Set());
   const socket = React.useRef<?WebSocket>(null);
+  const currentlyProcessedMessage = React.useRef<?Promise<mixed>>(null);
+  const socketSessionCounter = React.useRef(0);
   const promises = React.useRef<Promises>({});
   const heartbeatTimeoutID = React.useRef<?TimeoutID>();
 
   const identityContext = React.useContext(IdentityClientContext);
   invariant(identityContext, 'Identity context should be set');
   const { identityClient } = identityContext;
 
   const stopHeartbeatTimeout = React.useCallback(() => {
     if (heartbeatTimeoutID.current) {
       clearTimeout(heartbeatTimeoutID.current);
       heartbeatTimeoutID.current = null;
     }
   }, []);
 
   const resetHeartbeatTimeout = React.useCallback(() => {
     stopHeartbeatTimeout();
     heartbeatTimeoutID.current = setTimeout(() => {
       socket.current?.close();
       setConnected(false);
     }, tunnelbrokerHeartbeatTimeout);
   }, [stopHeartbeatTimeout]);
 
   // determine if the socket is active (not closed or closing)
   const isSocketActive =
     socket.current?.readyState === WebSocket.OPEN ||
     socket.current?.readyState === WebSocket.CONNECTING;
 
   const connectionChangePromise = React.useRef<?Promise<void>>(null);
   // The Tunnelbroker connection can have 4 states:
   // - DISCONNECTED: isSocketActive = false, connected = false
   //   Should be in this state when initMessage is null
   // - CONNECTING: isSocketActive = true, connected = false
   //   This lasts until Tunnelbroker sends ConnectionInitializationResponse
   // - CONNECTED: isSocketActive = true, connected = true
   // - DISCONNECTING: isSocketActive = false, connected = true
   //   This lasts between socket.close() and socket.onclose()
   React.useEffect(() => {
     connectionChangePromise.current = (async () => {
       await connectionChangePromise.current;
       try {
         const initMessage = await createInitMessage();
         const initMessageChanged = !_isEqual(
           previousInitMessage.current,
           initMessage,
         );
         previousInitMessage.current = initMessage;
 
         // when initMessage changes, we need to close the socket
         // and open a new one
         if (
           (!initMessage || initMessageChanged) &&
           isSocketActive &&
           socket.current
         ) {
           socket.current?.close();
           return;
         }
 
         // when we're already connected (or pending disconnection),
         // or there's no init message to start with, we don't need
         // to do anything
         if (connected || !initMessage || socket.current) {
           return;
         }
 
         const tunnelbrokerSocket = new WebSocket(tunnnelbrokerURL);
 
         tunnelbrokerSocket.onopen = () => {
           tunnelbrokerSocket.send(JSON.stringify(initMessage));
         };
 
         tunnelbrokerSocket.onclose = () => {
           // this triggers the effect hook again and reconnect
           setConnected(false);
           onClose?.();
           socket.current = null;
           console.log('Connection to Tunnelbroker closed');
         };
         tunnelbrokerSocket.onerror = e => {
           console.log('Tunnelbroker socket error:', e.message);
         };
         tunnelbrokerSocket.onmessage = (event: MessageEvent) => {
           if (typeof event.data !== 'string') {
             console.log('socket received a non-string message');
             return;
           }
           let rawMessage;
           try {
             rawMessage = JSON.parse(event.data);
           } catch (e) {
             console.log('error while parsing Tunnelbroker message:', e.message);
             return;
           }
 
           if (!tunnelbrokerMessageValidator.is(rawMessage)) {
             console.log('invalid TunnelbrokerMessage');
             return;
           }
           const message: TunnelbrokerMessage = rawMessage;
 
           resetHeartbeatTimeout();
 
           for (const listener of listeners.current) {
             listener(message);
           }
 
           if (
             message.type ===
             tunnelbrokerMessageTypes.CONNECTION_INITIALIZATION_RESPONSE
           ) {
             if (message.status.type === 'Success' && !connected) {
               setConnected(true);
               console.log(
                 'session with Tunnelbroker created. isAuthorized:',
                 isAuthorized,
               );
             } else if (message.status.type === 'Success' && connected) {
               console.log(
                 'received ConnectionInitializationResponse with status: Success for already connected socket',
               );
             } else {
               setConnected(false);
               console.log(
                 'creating session with Tunnelbroker error:',
                 message.status.data,
               );
             }
           } else if (
             message.type === tunnelbrokerMessageTypes.MESSAGE_TO_DEVICE
           ) {
             const confirmation: MessageReceiveConfirmation = {
               type: tunnelbrokerMessageTypes.MESSAGE_RECEIVE_CONFIRMATION,
               messageIDs: [message.messageID],
             };
             socket.current?.send(JSON.stringify(confirmation));
 
             let rawPeerToPeerMessage;
             try {
               rawPeerToPeerMessage = JSON.parse(message.payload);
             } catch (e) {
               console.log(
                 'error while parsing Tunnelbroker peer-to-peer message:',
                 e.message,
               );
               return;
             }
 
             if (!peerToPeerMessageValidator.is(rawPeerToPeerMessage)) {
               console.log('invalid Tunnelbroker PeerToPeerMessage');
               return;
             }
             const peerToPeerMessage: PeerToPeerMessage = rawPeerToPeerMessage;
-            void peerToPeerMessageHandler(
-              peerToPeerMessage,
-              identityClient,
-              message.messageID,
-            );
+            currentlyProcessedMessage.current = (async () => {
+              const localSocketSessionCounter = socketSessionCounter.current;
+              await currentlyProcessedMessage.current;
+              // Since scheduling processing this message socket is closed
+              // or was closed and reopened, we have to stop processing
+              // because Tunnelbroker flushes the message again when opening
+              // the socket, and we want to process this only once
+              // to maintain order.
+              if (
+                localSocketSessionCounter !== socketSessionCounter.current ||
+                !socket.current
+              ) {
+                return;
+              }
+              try {
+                await peerToPeerMessageHandler(
+                  peerToPeerMessage,
+                  identityClient,
+                  message.messageID,
+                );
+              } catch (e) {
+                console.log(e.message);
+              }
+            })();
           } else if (
             message.type ===
             tunnelbrokerMessageTypes.MESSAGE_TO_DEVICE_REQUEST_STATUS
           ) {
             for (const status: MessageSentStatus of message.clientMessageIDs) {
               if (status.type === 'Success') {
                 promises.current[status.data]?.resolve();
                 delete promises.current[status.data];
               } else if (status.type === 'Error') {
                 promises.current[status.data.id]?.reject(status.data.error);
                 delete promises.current[status.data.id];
               } else if (status.type === 'SerializationError') {
                 console.log('SerializationError for message: ', status.data);
               } else if (status.type === 'InvalidRequest') {
                 console.log('Tunnelbroker recorded InvalidRequest');
               }
             }
           } else if (message.type === tunnelbrokerMessageTypes.HEARTBEAT) {
             const heartbeat: Heartbeat = {
               type: tunnelbrokerMessageTypes.HEARTBEAT,
             };
             socket.current?.send(JSON.stringify(heartbeat));
           }
         };
 
         socket.current = tunnelbrokerSocket;
+        socketSessionCounter.current = socketSessionCounter.current + 1;
       } catch (err) {
         console.log('Tunnelbroker connection error:', err);
       }
     })();
   }, [
     connected,
     isSocketActive,
     isAuthorized,
     resetHeartbeatTimeout,
     stopHeartbeatTimeout,
     identityClient,
     onClose,
     createInitMessage,
   ]);
 
   const sendMessageToDeviceRequest: (
     request: MessageToDeviceRequest,
   ) => Promise<void> = React.useCallback(
     request => {
       return new Promise((resolve, reject) => {
         const socketActive = connected && socket.current;
         if (!shouldBeClosed && !socketActive) {
           throw new Error('Tunnelbroker not connected');
         }
         promises.current[request.clientMessageID] = {
           resolve,
           reject,
         };
         if (socketActive) {
           socket.current?.send(JSON.stringify(request));
         } else {
           secondaryTunnelbrokerConnection?.sendMessage(request);
         }
       });
     },
     [connected, secondaryTunnelbrokerConnection, shouldBeClosed],
   );
 
   const sendMessage: (message: ClientMessageToDevice) => Promise<void> =
     React.useCallback(
       (message: ClientMessageToDevice) => {
         const clientMessageID = uuid.v4();
         const messageToDevice: MessageToDeviceRequest = {
           type: tunnelbrokerMessageTypes.MESSAGE_TO_DEVICE_REQUEST,
           clientMessageID,
           deviceID: message.deviceID,
           payload: message.payload,
         };
 
         return sendMessageToDeviceRequest(messageToDevice);
       },
       [sendMessageToDeviceRequest],
     );
 
   React.useEffect(
     () =>
       secondaryTunnelbrokerConnection?.onSendMessage(message => {
         if (shouldBeClosed) {
           // We aren't supposed to be handling it
           return;
         }
 
         void (async () => {
           try {
             await sendMessageToDeviceRequest(message);
             secondaryTunnelbrokerConnection.setMessageStatus(
               message.clientMessageID,
             );
           } catch (error) {
             secondaryTunnelbrokerConnection.setMessageStatus(
               message.clientMessageID,
               error,
             );
           }
         })();
       }),
     [
       secondaryTunnelbrokerConnection,
       sendMessageToDeviceRequest,
       shouldBeClosed,
     ],
   );
 
   React.useEffect(
     () =>
       secondaryTunnelbrokerConnection?.onMessageStatus((messageID, error) => {
         if (error) {
           promises.current[messageID].reject(error);
         } else {
           promises.current[messageID].resolve();
         }
         delete promises.current[messageID];
       }),
     [secondaryTunnelbrokerConnection],
   );
 
   const addListener = React.useCallback(
     (listener: TunnelbrokerSocketListener) => {
       listeners.current.add(listener);
     },
     [],
   );
 
   const removeListener = React.useCallback(
     (listener: TunnelbrokerSocketListener) => {
       listeners.current.delete(listener);
     },
     [],
   );
 
   const value: TunnelbrokerContextType = React.useMemo(
     () => ({
       sendMessage,
       connected,
       isAuthorized,
       addListener,
       removeListener,
       setUnauthorizedDeviceID,
     }),
     [addListener, connected, removeListener, sendMessage, isAuthorized],
   );
 
   return (
     <TunnelbrokerContext.Provider value={value}>
       {children}
     </TunnelbrokerContext.Provider>
   );
 }
 
 function useTunnelbroker(): TunnelbrokerContextType {
   const context = React.useContext(TunnelbrokerContext);
   invariant(context, 'TunnelbrokerContext not found');
 
   return context;
 }
 
 export { TunnelbrokerProvider, useTunnelbroker };