Logging all traffic iRule.

SERVER_CONNECTED is an event that's fired when the LTM makes a connection to the backend node, so if the client connects and disconnects before the LTM ever makes a connection to the backend, you won't have those variables.

I'd recommend moving at least the

client

and

snat

variables to the CLIENT_ACCEPTED event. The

node

won't be available until the server connects, but you could initialize the variable in the client accepted event to some default value and then update it's value when the server connect happens.