I have been having some issues with one SharePoint site published through TMG that keeps timing out randomly.
A couple of times per day my users get a 408 error message from the webb browser saying that the connection has timed out. At the same time the TMG logs timeout errors as well:
"10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. "
The network topology looks something like this.
Image may be NSFW.
Clik here to view.
Both internal and external users access the site through TMG and are experiencing the same problems, so the firewall isn´t the one causing the problems.
Lately we have been testing with two users who access the site directly(not going throught the TMG) and they haven´t had any timeout problems, this makes me believe that the problem isn´t with the SharePoint server itself.
I have been runing a Wirshare capture on the SharePoint server during one of the timeout sessions.Image may be NSFW.
Clik here to view.
In the first image we see that the TMG(10.150.8.9) sends a GET / request to the SharePoint server at 15:46:40 from port 61293. Now this is interesting since no data has been sent from port 61293 in the last 9 minutes as you can see in the second image.
Same thing in 15:46:48 form port 61297.
Hasn´t that port/session timed out? Isn´t a three-way handshake required then?
I´m starting to believe that there is something fishy with the TCP communication between the TMG and the SharePoint server.
I should mention that we have other websites published throught TMG that work flawlessly.
Any help will be greatly appreciated! :)
Best Regards
