Question : Unable to connect to Exchange 2003 Server through VPN.

My CEO...being very picky about everything, wants to be able to access her e-mail on her laptop from anywhere in the United States.  We have a Verizon 1xEVDO Airprime CDMA Wireless modem express network card that provides her access to the internet.  We have a SonicWall firewall at work that we have setup a connection to using the SonicWall VPN Client software.  It connects to our file server fine...called NTFSROOT.  When I ping this it gets a reply of about .5seconds each time...not bad.  HOWEVER...when I PING the exchange server, which we call NTFSROOTB, it will not ping at all and reply back with "Ping request could not find host ntfsrootb.  Please check the name and try again."  HOWEVER...when I ping using the IP address...192.168.0.15, it pings successfully.  When this occured, I went into the e-mail properties of Outlook 2003, and changed the Microsoft Exchange server to point to 192.168.0.15 instead of NTFSROOTB.  When I select finish, then go back to double check the settings, the Exchange Server settings go back to the NTFSROOTB, instead of the IP address.  The error I get when attempting to connect to Microsoft Outlook 2003, is "Task 'Microsoft Exchange Server' reported error (0x8004011D): 'The server is not available.  Contact your administrator if this condition persists.'"  I have "Use Cached Exchanged Mode" UN-checked.  

Answer : Unable to connect to Exchange 2003 Server through VPN.

Did you pay attention to the spacing requirement in the domain controller line of the LMHOSTS file?
Using XP:

indows 2000/XP is using the extra time to search the remote computer for any Scheduled Tasks.
Note that though the fix is originally intended for only those affected, Windows 2000 users will experience
that the actual browsing speed of both the Internet & Windows Explorers improve significantly after applying it
since it doesn't search for Scheduled Tasks anymore.
Here's how :

Open up the Registry and go to :

HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Explorer/RemoteComputer/NameSpace

Under that branch, select the key :{D6277990-4C6A-11CF-8D87-00AA0060F5BF} and delete it.

This is key that instructs Windows to search for Scheduled Tasks.
If you like you may want to export the exact branch so that you can restore the key if necessary.

This fix is so effective that it doesn't require a reboot and you can almost immediately determine yourself how much it speeds up your browsing processes.

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Windows XP automatically searches the network for shares and printers upon connecting to the network. This is probably useful in a SOHO or home network but not the enterprise. To disable XP automatic discovery:
In Explorer, click Tools
Click Folder Options
Click the View tab,
Uncheck Automatically Search for Network Folders and Printers in Advanced settings list.

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If there are NT4.0 or any other pre-Windows 2000 PCs on the LAN, XP will transmit your password to the pre-Windows 2000 PCs during its share and print search. It transmits the LM hash which is significantly weaker than XP or Windows 2000 hashes. In order to protect the LM hash, XP has a registry value HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\NoLMHash which if set to 1 will prevent XP or Windows 2000 from generating the LM hash. pwdump will not be able to acquire the LM hash, which is a good thing.