Error Reply Message Mismatch 595 (0x253): How to Fix it

To fix this issue, use a debugger and analyze your code carefully

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ERROR_REPLY_MESSAGE_MISMATCH
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ERROR_REPLY_MESSAGE_MISMATCH usually affects developers and system admins, and it can cause issues with your system. If you ever encounter it, here are a few ways to fix it.

How can I fix ERROR_REPLY_MESSAGE_MISMATCH?

1. Debug the LPC message flow

  1. Attach a debugger such as WinDbg to monitor the process communication.
  2. Run the following command to display active LPC ports, message queues, and pending operations: !lpc -v
  3. Next, trace messages and look for mismatches in client IDs or missing replay handlers.
  4. Monitor thread states and ensure that the client thread is waiting for the message replay. You can do that with Process Explorer.
  5. Ensure that LCP message header and payload and intact. Don’t forget that both need to follow the expected formats.

2. Increase timeout for client threads

  1. Locate the timeout settings. Timeout is usually represented by the WaitForSingleObject function.
  2. Once you locate the code, adjust it. Increase the timeout, like this: DWORD waitResult = WaitForSingleObject(hEvent, 5000); // Extend to 5 seconds
    dword waitresult 5000
  3. Run the application again and check if the problem is still there.
  4. Optional: Use the infinite wait for debugging purposes, like this: DWORD waitResult = WaitForSingleObject(hEvent, INFINITE);

3.  Verify synchronization

  1. Check request and reply pairing and ensure each request sent by the client has a corresponding replay from the server.
  2. Use proper synchronizations with mutexes or semaphores. You can use the following code to do that:
    HANDLE hMutex = CreateMutex(NULL, FALSE, "LPC_Sync_Mutex");
    WaitForSingleObject(hMutex, INFINITE);
    // Critical section
    ReleaseMutex(hMutex);

    handle mutex
  3. Avoid using race conditions. These occur when multiple threads attempt to handle requests and replies simultaneously.
  4. Ensure that the Client ID in the LPC message matches the thread that is awaiting the reply.

4. Review the code

  1. Ensure that the client sends valid LPC requests while following the correct format.
  2. Ensure that the client is waiting for a response properly by using the ReplyWaitReceivePort or WaitForSingleObject functions.
  3. Ensure that the server is properly identifying the client thread to replay to. You can use the following code to achieve this: NtReplyPort(ServerPortHandle, &ReplyMessage);
  4. Ensure that the server isn’t sending duplicate or invalid replies.
  5. Handle replay errors like this:
    if (ReplyStatus != STATUS_SUCCESS) {
    // Log error or retry
    }

    status_success
  6. All logging and request all logs and replies to analyze them.

5.  Test for race conditions

  1. Simulate load scenarios with stress testing tools to generate a large volume of requests. This might help you locate synchronization bugs.
  2. Add debugging breakpoints to observe threads under high load.
  3. Add delays to your code with the following command: Sleep(100);
  4. Use debugging software such as Thread Analyzer or Intel Inspector to identify race conditions.

ERROR_REPLY_MESSAGE_MISMATCH might not be as easy to fix, and if the problem is still there, we recommend using tools such as Event Viewer, Process Monitor, or WinDbg to analyze the issue further.

This isn’t the only issue you can encounter while developing, and we already wrote about ERROR_PORT_MESSAGE_TOO_LONG and ERROR_DBG_REPLY_LATER in our previous articles, so don’t miss them.

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