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Unable to Connect to MS Exchange Server through VPN

This scenario does NOT work:  (1) Start computer, (2) Establish VPN connection, (3) Verify ability to ping MS Exchange Server, (4) Bring up Outlook 2007, (5) Observe there is no request for User name and Password, (6) Try to use outlook 2007, get error message "... 0x8004011D ... server is not available".  Notes:  (A) Computer worked OK approximately one week ago.  (B) Computer is connected by Ethernet cable.  (C) Happens with three computers, two of which are notebooks (first running Windows VISTA & Outlook 2007, second running Windows XP & Outlook 2007, third running Windows XP & Outlook 2003).  (D) Two notebooks (first & second computers) work normally if they are physically taken to remote location and connected to network by Ethernet cable.
EmailError-2-.pdf
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duxlerwm
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duxlerwm
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duxlerwmAuthor Commented:
I tried all of the suggestions in both of the links provided by SysExpert and none helped.  It is still the case that any computer that connot connect to my Exchange server through my VPN, can connect if it is physically moved and connected by Ethernet cable direclty to the same network that the Exchange server is connected to.
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duxlerwmAuthor Commented:
I tried all of the suggestions in both of the links provided by SysExpert and none helped.  It is still the case that any computer that connot connect to my Exchange server through my VPN, can connect if it is physically moved and connected by Ethernet cable direclty to the same network that the Exchange server is connected to.
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SysExpertCommented:
So what has changed in that week ?


Did you try to go back to a previous restore point on the working machine ?

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duxlerwmAuthor Commented:
On my end, nothing has changed.  If there was a change, as there must have been, it is on the side where the Exchange server is located.  IT personnel are checking that out, but have not yet come up with anything.
Regarding trying "to go back to a previous restore point on the working machine", there is no "working machine".  Five different computers, some running Windows VISTA, some Windows XP, some with Outlook 2003, some with Outlook 2007, are unable to connect to the Exchange server through the VPN.  Two of those computers are notebooks that could be conveniently moved physically to the remote site and connected directly by Ethernet cable.  In that case they are able to connect successfully to Outlook with no configuration changes of any kind.
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duxlerwmAuthor Commented:
In my previous comment I should have said "connect successfully to the Exchange server" instead of "Outlook" in my last sentence.
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duxlerwmAuthor Commented:
I tried all of the suggestions offered, but none helped.  This was not a DNS issue.  Eventually I got help from my Data Communications Department, which entered routes into the Cisco ASA appliance that eliminated my difficulty.
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