Thank you for your hint. I got it working with the password in the apache conf file for this virtual host. I took my a while but I figured it out.
For security reasons do not want the clear text password in the config file. The apache malual says:
AuthLDAPBindPassword Directive
Description:Password used in conjuction with the bind DN
Syntax:AuthLDAPBindPassword password
Context:directory, .htaccess
Override:AuthConfig
Status:Extension
Module:mod_authnz_ldap
Compatibility:exec: was added in 2.2.25.
exec is needet to retrive the password with some programm.
anyway.
@ Stefano: How do I use the template you linked above? I want to use a virtuel host where the protected direcories are defined.