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Outlook 2010 not connecting to exchange 2007 over a VPN

Hello,

Sorry to bother but I am having an issue on one of my customers.I have seen this error on other questions but haven't found the right solution for my case.  The problem is that we have a laptop where outlook 2010 is running and as it is a remote user it connects to different Wireless routers so the DNSs are always different.  When my user connect to a WiFi he is able to start the VPN client, connects with no problem, is able to access map drives on the server and see the server by name but when he starts outlook it just wont connect to exchange. I am able to create a new profile and see the exchange server and add other user accounts but when it goes back to outlook to send and receive email it simply stays disconnected.
I was able to solve the problem setting up manually the primary DNS leaving the exchange server IP address static as the primary DNS but obviously when he connects to different WiFi and just wants to simply surf the web he is not able.

Is there any fix for this? I never seen it happen before, and I've set up many remote users. Dont know if it is a problem with outlook 2010 or exchange 2007....

Any ideas?
Thanks!
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ITguy565
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If DNS is the problem then take it out of the equation.

I would recommend setting up the outlook profile using the ip address rather than the server name. Since the ip address is static this should not be a problem and will not require DNS resolution over the VPN.
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Thanks but the user profile is setup and it works when you set it up by server name or server IP address. The problem is when then you log into outlook it stays "disconnected"
What I was saying about the static IP was really Static DNS. If I ser the primary DNS on the wireless NIC to be the exchange server IP then it works but if I leave the DNS to be obtained by the dhcp server then it doesn't work any more.
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yes, Im able to ping the server by name and by IP address as well... no problem with that.
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Yes, got that on lmhosts and hosts file as well. thanks for the idea but still having the issue...
If I ser the primary DNS on the wireless NIC to be the exchange server IP then it works but if I leave the DNS to be obtained by the dhcp server then it doesn't work any more.

If this is the case then I am going to assume that your exchange server has DNS installed and functioning on it. Can you simply add this ip address as a Static DNS entry within your DHCP server that you are giving the computer the VPN IP address from?
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I ended up not having to do anything for issue to get solved. Customer called telling me things were just working now.
Thank you all for helping!!!