Forum Discussion
adick
Nimbostratus
NimbostratusTCL errors
Hey Team, We are experiencing some TCL errors with one of our iRules. I didn't build the iRule, but have inherited it from a past engineer, so I don't have a ton of knowledge on the specifics, bu...
adickNimbostratus
NimbostratusThanks Kees!
This seems to be a good solution.
Could there be other reasons the CLIENT_CLOSE event could get hit without the client sending data? I'm wondering if this iRule could be causing any problems with the VIPs that it is configured on? I heard from someone when you see TCL errors it usually means the VIP communication was cut off early.
Or if because it only triggers on CLIENT_CLOSE maybe it is something where the client already had problems communicating and this is just the error that triggers when there is another issue present.
Thanks
Your welcome.
CLIENT_CLOSED events gets triggers by the client ending the connection. And yes it is true, any TCL error will cause the Virtual Server to stop processing traffic.
rule1_msg1 not being filled with data (and causing the TCL error) will only happen if a client doesn't send any data after the connection has been created, same for SERVER_CLOSED TCL error. If this irule is attached to a virtual server without a proxy profile (L7 connection) the BIG-IP will create the server connection the moment thhttps://my.f5.com/manage/s/article/K8082e client connection is completed. If the client doesn't send any data, in the end the pool member will close its connection with the BIG-IP.
K8082 explains the differences between virtual server types.
It could be a client issue causing these erros' Still it is better to first create an empty variable to make sure you do not run into issues.
Cheers,
Kees