Publish a claim based enterprise portal via TMG server.

Hi all

Anyone have experience in publish a Dynamics AX EP via TMG server?  

 My environment is Dynamics AX 2012 + SharePoint 2010 + Forefront TMG 2010;

I have published a Claim based EP via TMG server. From client browser to TMG and TMG to SharePoint site are both using HTTPS and same SSL certification file. Now the issue is: I can access EP via my internal URL and everything is working fine.  I also can use external URL to access  EP  via TMG server.  But when i try to trigger some Ajax post back action, there is a JavaScript error and all the Ajax post back failed. The error message is:

Uncaught Sys.ScriptLoadFailedException: Sys.ScriptLoadFailedException: The script 'https://portal.tputilities.com.sg/ScriptResource.axd?d=NE3UDhnLSd6GpGqvQ9UCl_VOolCiNPjfrcsX2qm--dIu9tVpW1aaWGIImzfG0hDh3db7SlPYtvUJNy7jBVx-tU3ZTDWaE-L4ZIRW-jcztHYKw9Ib0tAzmb7sUn0d2T4l-AUVf4kMZVK0cuXOc2ppNktOBF01&t=ffffffffb868b5f4' could not be loaded. ScriptResource.axd:5

1. Error.createScriptResource.axd:5
2. Sys._ScriptLoader._errorScriptLoadFailedScriptResource.axd:5
3. Sys.WebForms.PageRequestManager._scriptIncludesLoadCompleteScriptResource.axd:848
4. Sys.WebForms.PageRequestManager._scriptIncludesLoadFailedScriptResource.axd:878
5. (anonymous function)ScriptResource.axd:15
6. (anonymous function)ScriptResource.axd:22
7. Sys._ScriptLoader._raiseErrorScriptResource.axd:2148
8. Sys._ScriptLoader._scriptLoadedHandlerScriptResource.axd:2165
9. (anonymous function)ScriptResource.axd:22
10. (anonymous function)
11. ScriptResource.axd:2279