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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. 503 Service Unavailable The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state. [26] 504 Gateway Timeout

  3. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    504 Server Time-out The server attempted to access another server in attempting to process the request, and did not receive a prompt response. [1]: §21.5.5 505 Version Not Supported The SIP protocol version in the request is not supported by the server. [1]: §21.5.6 513 Message Too Large

  4. HTTP persistent connection - Wikipedia

    en.wikipedia.org/wiki/HTTP_persistent_connection

    However, the default connection timeout of Apache httpd 1.3 and 2.0 is as little as 15 seconds [6] [7] and just 5 seconds for Apache httpd 2.2 and above. [8] [9] The advantage of a short timeout is the ability to deliver multiple components of a web page quickly while not consuming resources to run multiple server processes or threads for too ...

  5. HTTP 502 - Wikipedia

    en.wikipedia.org/wiki/HTTP_502

    Server overload: If a proxy server or gateway is overwhelmed with a large number of requests and is unable to process all of them in a timely manner, it can result in ...

  6. Cisco PIX - Wikipedia

    en.wikipedia.org/wiki/Cisco_PIX

    Cisco PIX (Private Internet eXchange) was a popular IP firewall and network address translation (NAT) appliance.It was one of the first products in this market segment. In 2005, Cisco introduced the newer Cisco Adaptive Security Appliance (), that inherited many of the PIX features, and in 2008 announced PIX end-of-sale.

  7. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    501 5.7.0 Client initiated Authentication Exchange (only when the SASL mechanism specified that client does not begin the authentication exchange) [3] 502 Command not implemented 503 Bad sequence of commands

  8. List of FTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_server_return...

    Range Purpose x0x: Syntax These replies refer to syntax errors, syntactically correct commands that don't fit any functional category, unimplemented or superfluous commands.

  9. Network address translation - Wikipedia

    en.wikipedia.org/wiki/Network_address_translation

    If a packet is sent to 203.0.113.1 by a computer at 192.168.1.100, the packet would normally be routed to the default gateway (the router) [e] A router with the NAT loopback feature detects that 203.0.113.1 is the address of its WAN interface, and treats the packet as if coming from that interface. It determines the destination for that packet ...