1) Restart the NVR/IPC: Try restarting the NVR/IPC device and the device you used to access it. This can help refresh the network connection and resolve any temporary issues.

2) Check the network connection: Ensure that the NVR/IPC and the device you are accessing it from (e.g., a smartphone or computer) are connected to the same network. Verify that both devices have a stable internet connection.

3) Confirm P2P settings: In the NVR/IPC settings, navigate to the P2P settings section. Ensure that the P2P feature is enabled and properly configured. Double-check the P2P ID or QR code associated with the device.

4) To resolve the issue, access the Web GUI, select "Set," choose "Network," and then select "General." Change the Default Gateway to 192.168.254.254, Preferred DNS Server to 8.8.8.8, and Alternate DNS Server to 8.8.4.4. Finally, click on the "Save" button at the bottom of the page.

5) Update firmware and software: Check for any available firmware or software updates for both the NVR/IPC and the device you are using for access. Updating to the latest versions can potentially resolve compatibility or connectivity issues.