BI Publisher Scheduler not working if security model is LDAP (Active Directory)

BI Publisher(11.1.1.5) Scheduler not working if security model is LDAP (Active Directory)I use BI Publisher 11.1.1.5 with BI Publisher Scheduler. (Software bi_windows_x86_111150_32_.....zip was installed)
The Problem arises in combination with MS Active Directory Authentication.

This shows the error:

Error 500--Internal Server Error
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1
10.5.1.500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.

What could be the cause?

Regards