network-protocols

I cannot connect to my local SQL Server Express (2012, but the version shouldn't matter) from my server (Windows 2008 R2) to use a tool on it (APEX SQL Data Diff if you are wondering). I can browse the network servers fine, and select my local instance from the dropdown of available servers, but when I go to search tables on the server, it times out with this error message (same is true of SSMS). A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that

How to understand stateless protocol and stateful protocol? HTTP is a stateless protocol and FTP is a stateful protocol. For the web applications requiring a lot of interactions, the underlying protocol should be stateful ones. Is my understanding right? Since you're asking about a Web application, the protocol will always be stateless -- the protocol for the Web is http (or https), and that's all she wrote. I think what you're thinking of is providing a state mechanism in your Web application itself. The typical approach to this is that you create a unique identifier for the user's session in

Below is HTTP-message definition in latest HTTP RFC 7230 HTTP-message = start-line *( header-field CRLF ) CRLF [ message-body ] Below is definition of header-field, header-field = field-name ":" OWS field-value OWS field-name = token field-value = *( field-content / obs-fold ) field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ] field-vchar = VCHAR / obs-text obs-fold = CRLF 1*( SP / HTAB ) ..and: obs-text = %x80-FF ..and ABNF's : VCHAR = %x21-7E ; visible (printing) characters As we can see, field-value could have multiple obs-folds and obs-folds has one CRLF. It is strange for me for

Currently I am doing a GPS Tracking project based on Django and GREENTEL It uses this protocol http://www.m2msolution.eu/doc/Fejlesztoi_dokumentaciok/GT03/GPRS%20Communication%20Protocol_GT03.pdf It says how to convert Latitude/ Longitude to Hex.. but I want to convert latitude hex data to the normal form Conversion method: A Convert the latitude (degrees, minutes) data from GPS module into a new form which represents the value only in minutes; B Multiply the converted value by 30000, and then transform the result to hexadecimal number. For example 22°32.7658′,（22*60+32.7658）*30000 = 40582974

Recently, while reading a Socket Programming HOWTO the following section jumped out at me: But if you plan to reuse your socket for further transfers, you need to realize that there is no "EOT" (End of Transfer) on a socket. I repeat: if a socket send or recv returns after handling 0 bytes, the connection has been broken. If the connection has not been broken, you may wait on a recv forever, because the socket will not tell you that there's nothing more to read (for now). Now if you think about that a bit, you'll come to realize a fundamental truth of sockets: messages must either be fixed