The HyperText Transfer Protocol (HTTP) 403 is generated in unusual cases. In this error user’s browser is communicating with the website server, the proper request has been made by the user, there is a specific result for the user request but the server is not authenticating the result for the user.
it shows results like “403 Forbidden error”, “Not accessible”.
403 Errors are not like 401 Errors. Reauthenticating will not solve the problem in this case.
It may be caused by the issue in your web server. You may have to contact your hosting service provider if your website is generating this error.
In some cases, if the admin has private the pages or post then also it might occur.
It indicates that the server understood the request but refuses to authorize it. means all the connections are proper but the user does not have proper permission to view the page.