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  2. 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 ...

  3. List of HTTP status codes - Wikipedia

    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.

  4. Transmission Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Transmission_Control_Protocol

    At the lower levels of the protocol stack, due to network congestion, traffic load balancing, or unpredictable network behavior, IP packets may be lost, duplicated, or delivered out of order. TCP detects these problems, requests re-transmission of lost data, rearranges out-of-order data and even helps minimize network congestion to reduce the ...

  5. Keepalive - Wikipedia

    en.wikipedia.org/wiki/Keepalive

    The Hypertext Transfer Protocol uses the keyword "Keep-Alive" in the "Connection" header to signal that the connection should be kept open for further messages (this is the default in HTTP 1.1, but in HTTP 1.0 the default was to use a new connection for each request/reply pair). [ 8] Despite the similar name, this function is entirely unrelated.

  6. GPRS Tunnelling Protocol - Wikipedia

    en.wikipedia.org/wiki/GPRS_Tunnelling_Protocol

    v. t. e. GPRS Tunnelling Protocol ( GTP) is a group of IP -based communications protocols used to carry general packet radio service (GPRS) within GSM, UMTS, LTE and 5G NR radio networks. In 3GPP architectures, GTP and Proxy Mobile IPv6 based interfaces are specified on various interface points. GTP can be decomposed into separate protocols ...

  7. Certificate revocation list - Wikipedia

    en.wikipedia.org/wiki/Certificate_revocation_list

    If a certificate is mistakenly revoked, significant problems can arise. As the certificate authority is tasked with enforcing the operational policy for issuing certificates, they typically are responsible for determining if and when revocation is appropriate by interpreting the operational policy.

  8. Handover - Wikipedia

    en.wikipedia.org/wiki/Handover

    A hard handover is perceived by network engineers as an event during the call. It requires the least processing by the network providing service. When the mobile is between base stations, then the mobile can switch with any of the base stations, so the base stations bounce the link with the mobile back and forth. This is called 'ping-ponging'.

  9. Ark: Survival Ascended - Wikipedia

    en.wikipedia.org/wiki/ARK:_Survival_Ascended

    Ark: Survival Ascended is an action-adventure survival video game developed by Studio Wildcard. It is a remaster of the 2017 game Ark: Survival Evolved . [ 1 ] It was released in early access for Windows on October 25, 2023, [ 1 ] Xbox Series X/S on November 21, 2023, [ 2 ] and PlayStation 5 on November 30, 2023.