Half-closed TCP with TCP request queuing: not working properly

Hello,

 

We are using BIG IP in TCP proxy mode with TCP request queuing.

 

We have a problem as our protocol relies on the half-closed state of the connections, i.e. client sends FIN when it has fully sent the data. And when the connection is in the queue and proxy gets FIN from the client it sends RST-ACK closing connection.

 

Correct behavior from my point of view is no to respond SYN-ACK to the client until the connection is being accepted by the backend.

 

Am I missing something in the configuration to make it work?

 

We are using standard type VS with TCP profile.

 

Thanks.