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2. 2021 Facebook outage - Wikipedia

   en.wikipedia.org/wiki/2021_Facebook_outage

   Major DNS resolvers returning "SERVFAIL" status for Facebook.com. Security experts identified the problem as a Border Gateway Protocol (BGP) withdrawal of the IP address prefixes in which Facebook's Domain Name System (DNS) servers were hosted, making it impossible for users to resolve Facebook and related domain names, and reach services.

3. Fix problems reading or receiving AOL Mail

   help.aol.com/articles/fix-problems-reading-or...

   Make sure the option "Block All Senders Except Contacts" under "Mail Settings --> Block Senders" is unchecked. If checked, you will not receive messages from anyone not in your contacts. Messages are often delivered right way though very rarely there may be a delay in transit. This is usually due to problems on the mail server, heavy internet ...

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

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

   If your account is working on a web browser and you made sure you're using the right server settings, then update your email app to the newest version available. If you're still experiencing issues with your app, contact the manufacturer. Also, access your AOL Mail on a web browser. Keep in mind - For two-step verification, generate an app ...

5. Internet Control Message Protocol - Wikipedia

   en.wikipedia.org/wiki/Internet_Control_Message...

   Destination unreachable is generated by the host or its inbound gateway [2] to inform the client that the destination is unreachable for some reason. Reasons for this message may include: the physical connection to the host does not exist (distance is infinite); the indicated protocol or port is not active; the data must be fragmented but the ...

6. Why can't I send mail to AOL Mail users?

   help.aol.com/articles/aol-mail-addresses-are-not...

   If you're repeatedly getting delivery failure errors when sending messages to AOL Mail customers, it is most likely due to spam blocking on AOL's servers. While you may be following at the rules for sending mail, it's likely the address you're sending mail from is hosted on a server our system had identified as "abusive". To restore your ...

7. Unbound (DNS server) - Wikipedia

   en.wikipedia.org/wiki/Unbound_(DNS_server)

   Unbound (DNS server) Unbound is a validating, recursive, and caching DNS resolver product from NLnet Labs. It is distributed free of charge in open-source form under the BSD license.

8. Black hole (networking) - Wikipedia

   en.wikipedia.org/wiki/Black_hole_(networking)

   A DNS-based Blackhole List (DNSBL) or Real-time Blackhole List (RBL) is a list of IP addresses published through the Internet Domain Name System (DNS) either as a zone file that can be used by DNS server software, or as a live DNS zone that can be queried in real-time.

9. List of HTTP status codes - Wikipedia

   en.wikipedia.org/wiki/List_of_HTTP_status_codes

   Cloudflare timed out contacting the origin server. 523 Origin Is Unreachable Cloudflare could not reach the origin server; for example, if the DNS records for the origin server are incorrect or missing. 524 A Timeout Occurred Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.