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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. DNS blocking - Wikipedia

    en.wikipedia.org/wiki/DNS_blocking

    Instead of returning the valid IP address of a requested site (for example, instead of 198.35.26.96 being returned by the DNS when "www.wikipedia.org" is entered into a browser, [2] if this IP were on a block list, the DNS might reply that the domain is unknown or with a different IP address that directs to a site with a page stating that the ...

  4. Domain Name System blocklist - Wikipedia

    en.wikipedia.org/wiki/Domain_Name_System_blocklist

    A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whether a sending host's IP address is blacklisted for email spam. [1] Most mail server software can be ...

  5. Internet outage - Wikipedia

    en.wikipedia.org/wiki/Internet_outage

    [74] At around 6:30 PM EST, Facebook reported that all their sites were up. Facebook CEO Mark Zuckerberg lost around $7B dollars after the outage. [75] For more info, see 2021 Facebook outage. 7 hours LAN connection BGP Withdrawal of IP Address (Facebook), Server overwhelming (other sites) Un­known Major websites 2022: 2022 Kazakhstan internet ...

  6. Greylisting (email) - Wikipedia

    en.wikipedia.org/wiki/Greylisting_(email)

    When the source of an email is a server farm or goes out through some other kind of relay service, it is likely that a server other than the original one will make the next attempt. For network fault tolerance , their IPs can belong to completely unrelated address blocks, thereby defying the simple technique of identifying the most significant ...

  7. IP address blocking - Wikipedia

    en.wikipedia.org/wiki/IP_address_blocking

    Unix-like operating systems commonly implement IP address blocking using a TCP wrapper, configured by host access control files /etc/hosts.deny and /etc/hosts.allow.. Both companies and schools offering remote user access use Linux programs such as DenyHosts or Fail2ban for protection from unauthorized access while allowing permitted remote access.

  8. 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 ...

  9. Help:I have been blocked - Wikipedia

    en.wikipedia.org/wiki/Help:I_have_been_blocked

    Problem with your editing or Wikipedia behavior (under any account or IP address) - your account or a connected IP has been used in a problematic way or there is a concern about your editing. Problem with your username - your username was unsuitable and has been blocked; you need to choose another before continuing.