![]() The pattern is that we only see traffic from the client to the server and no response from the server. How to Diagnose TCP Connection Faults 1 – SYN Without ConnectionsĪ first case you can easily diagnostic with Skylight is: “ Could my clients connect to my servers?” In the Skylight navigation menu, go to Application → Clients, then choose the TCP theme and set the Filter called “ Only Unilateral Flow”. And finally, the client sends an ‘ ACK’ to validate the connection.If it’s possible, the server will respond with an ‘ SYN+ ACK’, means “I receive your ‘SYN’ and I’m OK”.The ‘ SYN’ is the first packet sent from a client to a server it literally asks a server to open a connection with it.The three steps of the TCP handshake are: For more details, see this excellent article on Wikipedia. From this handshake, we can extract a performance metric called Connection Time (CT), which summarizes how fast session a can be set up between a client and a server over a network. How Does a Session Start? Tcp Handshake & Connection TimeĪ TCP connection, also called 3-way Handshake is achieved with SYN, SYN+ACK and ACK packets. In this series of articles, we will explain TCP meta information and explain why it is important for performance troubleshooting and how to measure it easily with Skylight™. TCP is used under a number of application protocols, such as HTTP, so it is important to know how to diagnostic TCP issues. To do so TCP has features such as Handshake, Reset, Fin, Ack, Push packets, and other types of flags to keep the connection alive and to not lose any information. TCP provides reliable, ordered, and error-free transmission. TCP works with the Internet Protocol (IP). The TCP protocol is a connection-oriented protocol, which means that a connection is established and maintained until the application programs at each end have finished exchanging messages. Let’s have a look at how TCP sessions are established… and what can go wrong! ![]() (See the bottom of this article for a full list) In this article, we will consider the TCP connection setup. This is the first article in a series of articles covering all you need to know to troubleshoot performance issues impacting applications relying on the TCP Protocol. How to Diagnose TCP Connection Setup I ssues?
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