Fixing WinForms WebAPI Access Denied Errors

If WinForm is denied access to WebAPI, it may be due to insufficient permissions or network connectivity issues. You can try the following solutions:

1. Check your network connection: make sure your computer can connect to the internet, try using a browser or other tools to access WebAPI to confirm that your network connection is working properly.
2. Check the URL and port number: Make sure the URL and port number you are using in WinForm are correct. You can try entering the same URL and port number in a browser to verify if you can access it properly.
3. Check permissions: If the WebAPI requires authentication or authorization, make sure you provide the correct credentials or token in the WinForm. If you do not have enough permission to access the WebAPI, you may need to contact the system administrator to obtain the necessary permissions.
4. Check the firewall settings: If your computer has a firewall, it may be blocking WinForm from accessing WebAPI. You can temporarily disable the firewall or configure it to allow WinForm to access WebAPI.
5. Check cross-domain access: If the WebAPI and WinForm are not on the same domain, this may cause cross-domain access issues. You can add the allowed domain in the cross-origin configuration of the WebAPI or use a proxy in WinForm to solve the cross-domain access issue.

If none of the above methods have resolved the issue, it is recommended that you check the logs and error messages of the WebAPI to better identify and resolve the problem.