An engineer is addressing a connectivity issue between two servers where the remote server is unable to establish a successful session. Initial checks show that the remote server is not receiving an…

The TCP three-way handshake involves a SYN from the client, followed by a SYN-ACK from the server, and finally an ACK from the client. If the SYN-ACK is not received after the initial SYN, it signifies a failure in establishing the TCP session.

UDP is a connectionless protocol and does not utilize a handshake process with SYN or SYN-ACK packets.

OSI configuration is a very broad term; while TCP operates at Layer 4 of the OSI model, 'incorrect OSI configuration' is too general and less specific than an incorrect TCP handshake.

Snaplen (snapshot length) is a setting for packet capture tools that defines the maximum number of bytes to capture per packet, and it does not directly cause handshake failures.