When adding a new ArcGIS Server connection on the same machine (127.0.0.1) using a DNS alias or any alias defined in the hosts file, you may end up in an authentication failure.
If you use "localhost", "127.0.0.1" or the machine name, all works fine though.
This question has been unanswered since 2004 at least for versions 9.1+.
(http://forums.esri.com/Thread.asp?c=2&f=59&t=117693 and others)
This is not related to ArcGIS, this is a windows (server) issue.
This is due to the windows "authentication loopback check".
See http://support.microsoft.com/kb/926642 for a resolution.
Basically, try adding the following DWORD registry key and set its value to 1 :
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\DisableLoopbackCheck
If you use "localhost", "127.0.0.1" or the machine name, all works fine though.
This question has been unanswered since 2004 at least for versions 9.1+.
(http://forums.esri.com/Thread.asp?c=2&f=59&t=117693 and others)
This is not related to ArcGIS, this is a windows (server) issue.
This is due to the windows "authentication loopback check".
See http://support.microsoft.com/kb/926642 for a resolution.
Basically, try adding the following DWORD registry key and set its value to 1 :
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\DisableLoopbackCheck