My mobile application is trying to hit an customized endpoint on SharePoint 2010 going through an HTTPS UAG trunk. The SP web application uses NTLM. Username/password are passed from the mobile application directly to the UAG.

My Fiddler shows this trace:

2014-02-19 21:14:11 10.1.72.40 GET /_vti_bin/endpoint.svc/System/ pCtxt=0000000004AAF7A0 443 - 10.1.72.105 UserAgentMobile/3.0.2+(iPhone+OS+7.0.2;+en_US;+iPhone5,1) 200 0 0 647

2014-02-19 21:14:23 10.1.72.40 GET /uniquesig9a16bf7295f23263f144a6cee71e1f4a/uniquesig0/InternalSite/InitParams.aspx?referrer=/InternalSite/InstallAndDetect.asp&resource%5Fid=753872DF29CA469990741167F069095C&login%5Ftype=8&site%5Fname=mobilesp2010&secure=1&URLHASH=58ae9f95%2D695a%2D4144%2Da0bc%2D411a0b3b4b27&orig%5Furl=https%3A%2F%2Fsp2010.local%2F%5Fvti%5Fbin%2Fendpoint%2Esvc%2F pCtxt=0000000004AAF7A0 443 - 10.1.72.105 UserAgentMobile/3.0.2+(iPhone+OS+7.0.2;+en_US;+iPhone5,1) 200 0 0 35

2014-02-19 21:14:23 10.1.72.40 GET /uniquesig9a16bf7295f23263f144a6cee71e1f4a/uniquesig0/InternalSite/InternalError.asp?site_name=mobilesp2010&secure=1&error_code=109 pCtxt=0000000004AAF7A0 443 - 10.1.72.105 UserAgentMobile/3.0.2+(iPhone+OS+7.0.2;+en_US;+iPhone5,1) 200 0 0 38

The question is: how to bypass and/or customize InstallAndDetect.asp which seems that's the next call it attempts (from UAG) after the endpoint initial call? I read this from the Ben Ari blog about UAG and stateless clients, and am wondering whether something needs to happen on the Client Mobile application or if there is something I can tweak on the UAG server itself?

Thanks