Riverbed Stingray负载均衡器超时覆盖apache php上的max_execution_time

We have 2 load balanced SLES12 servers running apache with PHP to provide a number of corporate browser based systems.

For running reports etc. I've set the max_execution_time etc to a high number. e.g.:

set_time_limit(10000);

This works fine when accessing either server via the direct URL for a given server.

When accessing the load-balanced URL, however, our Riverbed Stingray load balancer seems to have it's own timeout and times out after about 30 seconds during page execution.

The staff who configure the Stingray load balancer don't know what to change to improve things.

I've had little luck searching. Anyone got any ideas or suggestions?

Many Thanks