This counts the number of times a TCP connection underlying this FCIP link was closed down because it experienced a TCP keep-alive timeout -- the remote end simply stopped responding to keepalive probes. This distinguishes a specific failure mode, an unresponsive peer, from other closure reasons like too-many-errors or excessive dropped datagrams, letting an admin narrow down whether outages on this link are caused by the remote entity going silent versus an actively degrading path. A spike in this counter correlating with a known remote-site power or device outage would confirm the FCIP link's TCP connection dropped specifically because the remote end stopped answering, not because of a local or mid-path issue.