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The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API). 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. 503 Service Unavailable
A user attempts to access a website by entering the URL in their browser. A proxy server first receives the user's request. Acting as an intermediary, the proxy server forwards the request to an upstream server.
The name invalid is reserved by the Internet Engineering Task Force (IETF) as a domain name that may not be installed as a top-level domain in the Domain Name System (DNS) of the Internet. [ 1 ] Reserved DNS names
A uniform resource locator (URL), colloquially known as an address on the Web, [1] is a reference to a resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of Uniform Resource Identifier (URI), [ 2 ] [ 3 ] although many people use the two terms interchangeably.
Hover over hyperlinks with your cursor to preview the destination URL. Sometimes a hyperlink can be displayed as an AOL link in an email when in fact the destination URL is to a malicious domain. • Be careful when authorizing an app to access your account or when providing any third-party access to your account info.
Authentication required: In some cases, the server requires authentication to access certain resources. If the user does not provide valid credentials or if the authentication fails, a 403 status code is returned. IP restrictions: The server may also restrict access to specific IP addresses or IP ranges.
Monitoring your recent login activity can help you find out if your account has been accessed by unauthorized users. Review your recent activity and revoke access to suspicious entries using the info below.
If you're having problems sending mail, there are a few troubleshooting steps you can take to fix the problem. Restart your computer:. If you haven't shut down your computer in a while, we recommend that you begin troubleshooting by restarting your computer.