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407 Proxy Authentication Required The client must first authenticate itself with the proxy. 408 Request Timeout The server timed out waiting for the request. According to HTTP specifications: "The client did not produce a request within the time that the server was prepared to wait.
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.
If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead.
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If your third-party email app is having issues connecting, sending, or receiving emails, you may need to reconfigure your account or update the app. Use these steps to identify and fix the source of the problem.
Proxy-Authenticate: Request authentication to access the proxy. Proxy-Authenticate: Basic: Permanent RFC 9110: Public-Key-Pins [55] HTTP Public Key Pinning, announces hash of website's authentic TLS certificate: Public-Key-Pins: max-age=2592000; pin-sha256="E9CZ9INDbd+2eRQozYqqbQ2yXLVKB9+xcprMF+44U1g="; Permanent RFC 7469: Retry-After
407 Proxy Authentication Required The request requires user authentication. This response is issued by proxies. [1]: §21.4.8 408 Request Timeout Couldn't find the user in time. The server could not produce a response within a suitable amount of time, for example, if it could not determine the location of the user in time.
IEEE 802.1X is an IEEE Standard for port-based network access control (PNAC). It is part of the IEEE 802.1 group of networking protocols. It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN.