How to manage Log in channel when I use easyblog and easysocial ?

Hello,

1. How to manage Single Sign On?
My site used both component ( EasyBlog , EasySocial ) and My members come form Authentication Ldap. Should I choose EasyBlog or EasySocial for the first login?

2. We allow our members log in By Username and Password form LDapAD, So I want to closed channel for register. Can I make it ? How?

3. I had Migrated site form Joomla 2.5 to Joomla 3 and Upgrade all component But I found that our user can not access to my site when them log in by Username and password form Ldap.
The page will show blank page Please check form attach picture.

Please advice;

Best regards,

EaungfahJ.