3 Handy Solutions to Resolve Yahoo Error 403 The Yahoo 403 error is similar to the error ‘403 Forbidden Unauthorized IP address.’ It shows an issue with the proxy server in that case the requested information or data isn’t transferring to one cause or the other. The error ‘403 forbidden’ displays when an Internet server doesn’t allow access to a specific URL or the website. This error mainly happens when you try to submit a sitemap to the search engines. Although the professionals at Yahoo support contact number are always available to help you fix the issues, you can follow the solutions listed below.