Resolved Outlook2007 magically changes config...

Has anyone ever seen this? My Outlook client is configured to use RPC over HTTP to hit the Exchange server. When Outlook comes up, it reaches out to 'myproxy.myplace.com' on TCP/443. This works fine. Then magically, it will try to reach *directly* to the Exchange Server on TCP/135 without me changing a thing. This port is not open through our network, and the connection fails. Only TCP/443 to the proxy is allowed. Both checkmarks are checked on my system: a.)On slow networks, use HTTP, then use TCP and b.)On fast networks, use HTTP, then use TCP. How does my client magically determine that its going to use TCP/135, and not TCP/443 to the proxy all of the sudden? Can I hard-code this, or force communication on TCP/443 only?

 

Thanks -- It doesn't misbehave all the time; only some of the time. It will use TCP/443 just fine, then all by itself it will switch to TCP/135. I know the control pannel has checkmarks for

On slow networks, use HTTP, then use TCP

On fast networks, use HTTP, then use TCP

I'm wondering what logic Xp uses to determine 'how fast my network is'? also, is there a way in the registry to hard-code the connection behaviour, so XP doesn't have to guess/judge how my network's feeling today...