Exchange 2007 and windows server 2008

I am using Windows 2008 Server with Exchange 2007, every thing has been working godd, but after about 4 months of working fine, the outlook 2007 clients form remote are asking for login usernames and passwordd.

The client can enter the correct username and password but exchange will not connect.  Give the server about an hour or two and they will start connecting like normal with no problems.  This is only effecting the external users, internal users are not having the issue  I cannot find anything in the event logs nor the server settings that would cause this problem.  When the problem is happening the users can log into the OWA and work with no problems, and authenticate with no prblems, but the outlook clint will not.

Outlook 2007  client are connecting with the following settings.  

Connect to Microsoft exchange over HTTP

Proxy server for exchange  https://mail.technologyplusonline.com

connect to exchange server with name in certificate --- msstd:mail.technologyplusonline.com


These connections will work fine with no errors for a long time then strat messing up.  I do not have to make any changes for the problem to fix itself after a period of time.
geekalternativeAsked:
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Computer101Connect With a Mentor Commented:
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bribri007Commented:
is this affecting all outlook clients, or only a few?  When someone with a problem is trying to authenticate, have you ran outlook /rpcdiag to see if the clients are where the problem is?  Anything in the app logs for a client pc?
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tigermattCommented:
When the problems occur, try starting outlook using the /rpcdiag switch. This will bring up a connection window for the Outlook RPC over HTTPS connection, allowing you to see what part is failing.
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geekalternativeAuthor Commented:
When i run the .rpcdiag when opening outlook the only thing that happens is that is starts asking for the password again, and asking me to reconnect to exchange.

this problem only occurs with client outside the main office,  No one inside the main office has the problem.
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tigermattCommented:
That is what is meant to happen. The /rpcdiag switch simply runs Outlook in the usual fashion, but the second popup is just a box showing troubleshooting information, so we can see where the exact problem is. You need to login using the usual method (this must be done anyway) and then the part the RPC fails on will be reported in the RPC Diagnostics popup, and you can post a screenshot here for us to take a look at.
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geekalternativeAuthor Commented:
Here is a screen shot from the /rpcdiag
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tigermattCommented:
Hmm... don't seem to see any screenshot I'm afraid - I guess you missed it?! :(
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geekalternativeAuthor Commented:
Sorry, it did not seem to attach where i wanted it to.  I am waiting on Microsoft to call me back, but i have noticed that i am getting an event id 24 and 18 on the server if this helpes anyone,  then this morning i started getting a id 1058, i have made no changes to the system at this time, but it seem to be getting worse.
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tigermattCommented:
It sounds like something quite serious. Are Microsoft calling back today?
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geekalternativeAuthor Commented:
Ended up being the rpcproxy.dll was causing all the problems, once i removed it and put it back the server is now working fine with no problems, thank you for all the suggestions,  microsoft is the one the gave the solution, but caos 275.00
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tigermattCommented:

It definitely didn't sound like the usual behaviour or 'errors' I would expect!

I don't have any objections with you pressing "Accept as Solution" beside your own comment above, since you solved your question yourself and posted the answer.

-tigermatt
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