Hi there, @qusrawi.
Welcome to the Community. I'm here to help resolve the errors you encounter during the financial exchange process.
Since there are a lot of reasons why these errors occur, let me share with you our help article instead. You can read through and learn how to troubleshoot 3000 status code errors during the financial exchange by clicking each different error code topics. Each topic contains reasons and troubleshooting steps.
If you have any concerns while working in QuickBooks, feel free to post again. We're always happy to assist. All the best!