Windows XP and VPNs

[gddess]

I am currently working with a few people who are using a VPN Connection (PPTP and IPSec) into an Enterprise Company with either Windows XP Home or Pro. The problem is that once they are connected they are attempting to connect to and Exchange 2000 Server and receiving the error "Logon Credentials Have Failed" or "Your MS Exchange Server is unavailable." Outlook 2000 or XP will continously prompt for Login Credentials, even when not selected.

They can ping the servers by host name and IP Address, tried to create a new profile using both, receive the same symptoms. I have followed these MS Q Articles

http://support.microsoft.com/default.aspx?scid=kb;EN-US;163576

http://support.microsoft.com/default.aspx?scid=kb;en-us;268575

http://support.microsoft.com/default.aspx?scid=kb;en-us;272290

http://support.microsoft.com/default.aspx?scid=kb;en-us;307926

None of these solutions work. The strange thing is that a customer can use Outlook 2K or Outlook XP to access their local Internet Email but not Corporate. The last resort would be to uninstall and reinstall TCP\IP, but I don't understand why we would have to do this.

Any thoughts??

 

[bcastner]

Did you follow this one as well?

http://support.microsoft.com/?kbid=310642

 

[bcastner]

"The last resort would be to uninstall and reinstall TCP\IP, but I don't understand why we would have to do this."

It is interesting to read your link to Microsoft 268575 as it offers absolutely no advice for XP clients about re-installing TCP/IP except through a registry transfer from a working machine.

Try this. Use regedit on a problem machine. Goto the following key and make certain all 6 entries are there. If not, enter by hand the missing Keys:

[tt]
HKEY_LOCAL_MACHINE\Software\Microsoft\RPC\ClientProtocols

KEY VALUE (BINARY_STRING)
(Default) rpcrt4.dll
ncarn_np rpcr4t.dll
ncacn_http rpcrt4.dll
ncacn_ip_tcp rpcrt4.dll
ncacn_nb_tcp rpcrt4.dll
ncadg_ip_udp rpcrt4.dll

[/TT]

 

[Bobg1]

Delete any profile that is already in outlook and start by setting up a new one. You do this by right clicking the icon and selecting properties.

Another issue could be do to settings on a firewall.