Access to localhost was denied

1. What causes a 403 error?
2. Does 403 forbidden mean I'm blocked?

What causes a 403 error?

The HTTP 403 Forbidden response status code indicates that the server understands the request but refuses to authorize it. This status is similar to 401 , but for the 403 Forbidden status code, re-authenticating makes no difference. The access is tied to the application logic, such as insufficient rights to a resource.

Does 403 forbidden mean I'm blocked?

It simply means that, for some predetermined reason, the website's content you're trying to access is being blocked. The reason might be within your control – but it's more likely caused by something on the content owner or server side.