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Is it possible to use mod_authnz_ldap to protect a virtual directory, but without prompting the user for his username?

I'd just like to use his windows login and check if it exists on the LDAP server (NOVELL).

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No it is not possible. The normal SSO (single-sign-on) method is GSSAPI (usually with a Kerberos implentation). Both Internet Explorer and Firefox support the GSSAPI. Novell's "eDirectory" server seems to as well, though I've never set it up.

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