TCL error - TCP connection logging iRule

If no server connection is established, the client variable won't be set. So I assume that the log message you're getting for CLIENT_CLOSED isn't actually from that connection.

You can use the clientside command to get the virtual server (or client's destination IP:port) in a serverside event like SERVER_CONNECTED instead of saving it in CLIENT_ACCEPTED.

http://devcentral.f5.com/wiki/iRules.clientside.ashx

when SERVER_CONNECTED {
log local0.info "client: [IP::client_addr]:[TCP::client_port] -> VIP: [clientside {IP::local_addr}]:[clientside {TCP::local_port}] -> Node: [IP::server_addr]:[TCP::server_port]"

}
when CLIENT_CLOSED {
log local0.info "client: [IP::client_addr]:[TCP::client_port] -> VIP: [IP::local_addr]:[TCP::client_port]"
}

Aaron