I'm getting sporadic HTTP 408 responses when I try to load pages from my site.
The network is set up with Forefront acting as a proxy in front of the web server. When I first load the page, it comes up normally. If I immediately click another page in the site, it also comes up normally.
If I wait a couple of minutes before clicking anything, I get HTTP 408 in the browser.
TMG's log shows several entries:
Action - Result Code - Status
Closed Connection - 0x80074e21 FWX_E_ABORTIVE_SHUTDOWN: "A connection was abortively closed after one of the peers sent an RST packet."
Failed Connection Attempt - (no result code): "10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because a connected host failed to respond."
Closed Connection - 0x80074e20 FWX_E_GRACEFUL_SHUTDOWN: "A connection was gracefully closed in an orderly shutdown process with a three-way FIN-initiated handshake."
On the web server itself, Resource Monitor shows that the TCP connection to Forefront expired shortly before the request that got the 408 response.
Is there a configuration setting that can be changed to avoid this?