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Outlook over HTTPS client disconnects from server intermittently

I have a client with an SBS2003 (Standard) server running Exchange
(SP2). Their network works well, expecpt for the following issue:

The company owner (who lives in FL) has connected to the office in MD
for approx 2 years now, successfully using Outlook over the Web (RPC
over HTTPS) with no problem. Over the past 6 weeks, however, his
connection using Outlook from his house keeps disconnecting; some days
it works fine, other days it's terrible. When it's bad, it's REALLY bad.

Here's what I've done so far: I have checked their internet connection
speed (Verizon DSL), and the download is not too bad (~950kbps); but
their upload is rather poor (no better than 450kbps). Now, more
recently, we've had other users make RDP connections into the office
to work from home (about 4 users in total, though there are usually no
more than 2 connected at a time).

The timeframe when he started having trouble does somewhat coincide
with the increase in potential RDP connections, but I cannot say for
sure that this is the issue.

I've tried to use a rather "squirrelly" Windows2003 Resource Kit
utility called "RPCPing" to test the RPC connection to the server &
the mail store, but the utility is (currently) failing, though I'm
also unable to connect to the owner Exchange mailbox (via RPC) right
now, either (I have his account config replicated on my PC for testing

Does anybody know if a slow internet connection (specifically the
UPLOAD speed being below 500kbps) will make the RPC and/or Exchange
server kill the connection to the remote Outlook client?

Any help would be greatly appreciated!


1 Solution
are any of the other users having this problem?
500kbps is no problem.  That's actually decent for most home internet connections.

Run a static ping from his house and see if there's a break in his Internet connection.  Sounds like a problem on his home router or something if no other users are experiencing problems.  

You can also verify some settings with this guide:
ethernet69Author Commented:
Thanks for the questions/comments - I'll address them all here:

- He's the only user with this problem, but I have the SAME problem when I access his mailbox via the same mechanism from my house. He also has the same problem if he accesses his mailbox from other locations (with his laptop), so it's not his home connection. I've also checked to make sure that OUtlook settings are configured correctly.

No, the 500kbps speed is on the SERVER end, NOT the client end...that's the upload speed, which is pretty weak with multiple connections.

Let me pose my question again: Does anybody know DEFINITIVELY if Exchange will disconnect RPC over HTTPS clients if the server-side bandwidth falls below a certain "threshold?'

Any feedback/thought would be appreciated.

ethernet69Author Commented:
This problem was resolved by replacing the network firewall, as it was opening & closing the SSL channel "at will" - resolved by self. - Brian

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