Exchange 2013 autodiscover not working from Externally

Hi 
i have exchange 2010 sp3(2Mb, 2hub/cas). I installed exchange 2013 servers(2MB, 2CAS). For coexistence i generated new certifcate with new cas from third party. I installed that certificate in that cas and assigned all services. i changed all my virtual
directories service url. I didnt import the new certificate to exchange 2010 cas server and i didnt change url to legacy link.But still iam able to check exchange 2010 user mailbox owa, activesync and autodiscover without any certificate error. 
If i try to browse owa, its going to 2013 server, if user is exchange 2010 user and its redirecting to exchange 2010 owa with same link.
But i dont know how above things is working without importing to new certificate...
Main problem is i am not able to configure exchange 2013 users outlookanywhere, Autodiscover from externally...
So in tmg i pointed the outlook anywhere ip address new cas server, now both exchange 2010 and exchange 2013 users while OA from external, its keep on asking password... Not accepting it...
Please help me to fix this issue..

Hi ,
On TMG please have the outlook anywhere rule like below and check the status.
Step
1 :
On the TMG rule - >authentication delegation ---> select the option "no delegation users can authenticate directly"
Step
2 :
on the users tab in the TMG rule - just add "all users" group on that rule.
By having the above settings we have avoided the issues in your environment.
Note : Based on the above setting's , Each and everyone in exchange will have a access to the outlook anywhere from external world , because there would not be having any restriction on the TMG rules.
Please have a look in to the below link , it will give you some ideas which is related to TMG
http://blogs.technet.com/b/exchange/archive/2012/11/21/publishing-exchange-server-2013-using-tmg.aspx
Thanks & Regards S.Nithyanandham

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