InfoPath published Forms error using DNS Record: Event ID 5566, in MOSS 2007 64Bit

InfoPath Form Services Error accessing data source eventid 5566 in SharePoint 2007 

SYMPTOM:

Forms when accessed through the browser using DNS Record (A Record created in DNS: intranet) was showing error. There are no issues when accessing the same forms using hostname(http://intra-app1)

ENVIRONMENT:

SharePoint 2007 SP2 (CU August 2011: 12.0.0.6565), OS: Windows 2008 R2 Enterprise Edn.

SCOPE:

Published Forms opens properly from client access using WFE server hostname (http://intra-app1 ) (Hostname of WFE: intra-app1)

However, the forms could not be accessed using the DNS entry (http://intranet). shoots errors ID 5566 as seen below:  

ACTION:

Inorder to solve this we configured the following setting in the registry for disabling the loopback check in the registry using the following method.

In Registry Editor, locate and then click the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

Right-click Lsa, point to New, and then click DWORD Value.

Type DisableLoopbackCheck, and then press ENTER.

Right-click DisableLoopbackCheck, and then click Modify.

In the Value data box, type 1, (hexadecimal) and then click OK.

No need to either restart the server or carryout IISreset /noforce

This is enough, just try accessing portal using the DNS and the published forms using DNS record (http://intranet). This should solve the problem.

 

Also, make sure AAM (Alternet Access Maping: http://intranet) to Intranet Zone is configured at the CA level .