TCP resets ; Flow expired (sweeper; aggressive) (low packet rate connection)

Hello!

 

I am getting some TCP resets from the F5 load balancer. The ltm log says Flow expired (sweeper; aggressive) (low packet rate connection)

 

What does this mean? We send a http get request to the web server which passes through the load balancer and at times it takes up to 20 seconds before the response comes back. We see that when it takes long for the response to come back, F5 sends out TCP resets.

 

Any clues how to fix this?

 

-a