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  2. List of HTTP status codes - Wikipedia

    https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

    An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.

  3. Linux - Wikipedia

    https://en.wikipedia.org/wiki/Linux

    A Linux-based system is a modular Unix-like operating system, deriving much of its basic design from principles established in Unix during the 1970s and 1980s. Such a system uses a monolithic kernel, the Linux kernel, which handles process control, networking, access to the peripherals, and file systems.

  4. HTTP Strict Transport Security - Wikipedia

    https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security

    A server implements an HSTS policy by supplying a header over an HTTPS connection (HSTS headers over HTTP are ignored). [1] For example, a server could send a header such that future requests to the domain for the next year (max-age is specified in seconds; 31,536,000 is equal to one non-leap year) use only HTTPS: Strict-Transport-Security: max-age=31536000.

  5. Fix problems signing in to AOL Mail - AOL Help

    https://help.aol.com/articles/fix-problems-signing-in-to...

    Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. Fix problems signing in to AOL Mail. While most sign in problems can stem from password issues, you might also get blank or missing screens, or various errors when trying to sign in.

  6. Fix sending and receiving issues with third-party email apps

    https://help.aol.com/articles/cant-send-or-receive-email...

    Fix sending and receiving issues with third-party email apps. 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.

  7. HTTP 404 - Wikipedia

    https://en.wikipedia.org/wiki/HTTP_404

    Microsoft's IIS 7.0, IIS 7.5, and IIS 8.0 servers define the following HTTP substatus codes to indicate a more specific cause of a 404 error: 404.0 – Not found. 404.1 – Site Not Found.

  8. Use POP or IMAP to sync AOL Mail on a third-party app or ...

    https://help.aol.com/articles/how-do-i-use-other-email...

    There are two different protocols you can choose when setting up a third-party email app: POP or IMAP. POP downloads a copy of your emails from your account (mail.aol.com) to the app. This means that if you delete an email from your account after it's been downloaded, the downloaded copy remains in the app. Additionally, POP only downloads ...

  9. Red Hat Enterprise Linux - Wikipedia

    https://en.wikipedia.org/wiki/Red_Hat_Enterprise_Linux

    Red Hat Enterprise Linux ( RHEL) is a commercial open-source [ 6][ 7][ 8] Linux distribution [ 9][ 10] developed by Red Hat for the commercial market. Red Hat Enterprise Linux is released in server versions for x86-64, Power ISA, ARM64, and IBM Z and a desktop version for x86-64. Fedora Linux and CentOS Stream serve as its upstream sources.