[Xymon] xymoncgimsg.cgi timeout limit

I've been adding a lot of hosts to our system using the XymonPSclient which sends it's data over port 443 to xymoncgimsg.cgi I've got 1 hosts who's payload is over a Meg and the logs seem to indicate that it's timing out before the payload completes it's send.  The client logs say this. body length 1075939, timeout 100000ms

I know 100000 ms is nearly 2 minutes, but I've already got the Xymon server set to accept very large payloads and have never had this problem before.  And it's only this 1 host that has a large payload.  Where would I look to expand the timeout limit?  Is this a PS client script issue, an Apache server issue, or a xymoncgimsg.cgi config issue?

-- Kris Springer