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LDAP authentication failing from web page

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Last Modified: 2015-09-06
on one of my web sites I set LDAP authentication via a LDAP query to my domain DC. if i go and log into the default main page authentication seems to work fine. If i go into a sub page containing a .aspx file authentication will fail

I get this message

Exception information:
    Exception type: System.DirectoryServices.AccountManagement.PrincipalServerDownException
    Exception message: The server could not be contacted.

Inner exception information (level 1):
    Exception type: System.DirectoryServices.Protocols.LdapException
    Exception message: The LDAP server is unavailable.
 
The only place where the LDAP string is declared is via the web.config file.
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