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How to disable loopback check for local IIS websites:

July 21st, 2010 DynamicsMSCRM No comments

How to disable loopback check for local IIS websites:
There are 2 ways to get past this anoyance.
In my case I could have just ignored it and loaded up CRM from another computer, but it would be anoying to not be able to see the CRM webpage from the App server.
Both solutions require registry editing, so remember to create a backup first.
Solution 1 (Preferred): Specify which host names that does not cause loopback check.

1: Open up the registry editor by typing regedit under Run.
2: Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0
3: Right-click MSV1_0 and click New and choose to make it a Multi-String Value.
4: Enter BackConnectionHostNames as name for the entry, and double-click it to modify it.
5: Type the hostnames you need to use (code-journey.com for instance).
6: Restart IISAdmin Service (”Start” -> “Administrative Tools” -> “Services”)

Solution 2 (Not recommended):
1: Open up the registry editor by typing regedit under Run.
2: Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
3: Right-click Lsa and click New and choose to make it a DWORD Value.
4: Enter DisableLoopbackCheck as name for the entry, and double-click it to modify it.
5: Set the value to 1 and click OK

You should now be able to log in to CRM, or any other IIS website, locally from the server.

Sourced From Code-Journey

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Categories: Friendly URL, IIS, Loopback Tags: