Couple of minutes ago one of our bots announced that has finished the DNS Leakage test. We decided to launch this test on request of one of our partner’s company which deals with private data auditing. They were interested in which sensitive information could be retrieved from the DNS.
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Simple Mail Transfer Protocol (SMTP) is the de facto standard for e-mail transmissions across the Internet. Formally SMTP is defined in RFC 821 as amended by RFC 1123. The protocol used today is also known as ESMTP and defined in RFC 2821. The main role of this article is not to explain SMTP as itself (RFC’s describe this pretty deeply) but provide quick reference to SMTP Reply Codes. An example of basic SMTP communication is also stated here, below table.
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Hypertext Transfer Protocol (HTTP) is a communications protocol for the transfer of information on intranets and the World Wide Web. Its original purpose was to provide a way to publish and retrieve hypertext pages over the Internet. HTTP is a request/response standard between a client and a server. A client is the end-user, the server is the web site. In this short article you can find Numeric Order List of HTTP/1.1 Reply Codes as a reference. All codes in the table are linked to other articles which describe specific response code deeper.
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The Internet protocol suite is the set of communications protocols that implement the protocol stack on which the Internet and most commercial networks run. It has also been referred to as the TCP/IP protocol suite, which is named after two of the most important protocols in it: the Transmission Control Protocol (TCP) and the Internet Protocol (IP), which were also the first two networking protocols defined. Class Ranges, Special Ranges and Bit-Wise Representation of TCP/IP Network Classes are stated here for quick reference purposes.
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FTP is a file transfer protocol for exchanging files over any TCP/IP based network to manipulate files on another computer on that network regardless of which operating systems are involved (if the computers permit FTP access). There are many existing FTP client and server programs. FTP servers can be set up anywhere between game servers, voice servers, internet hosts, and other physical servers. This article presents Numeric Order List of FTP Reply Codes for quick reference purposes.
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What are FTP status codes assemblied of, what are their meaning and other details of FTP service replies describes this post.
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The server does not support, or refuses to support, the HTTP protocol version that was used in the request message.
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The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified by the URI (e.g. HTTP, FTP, LDAP) or some other auxiliary server (e.g. DNS) it needed to access in attempting to complete the request.
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The server is currently unable to handle the request due to a temporary overloading or maintenance of the server. The implication is that this is a temporary condition which will be alleviated after some delay.
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The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request.
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