Voila, je crois que la reponse est la :
One note: If this is a domain controller, you will need to set it with the 'Domain Controller Security Policy' editor under the 'Administrative Tools' Menu. Otherwise it'll be reset nightly.You need to go to 'Security Settings', 'Local Policies', 'Security Options'. You then need to set the 'Microsoft network server: Digitally sign communications' to disabled. It is enabled by default.
One note: If this is a domain controller, you will need to set it with the 'Domain Controller Security Policy' editor under the 'Administrative Tools' Menu. Otherwise it'll be reset nightly.You need to go to 'Security Settings', 'Local Policies', 'Security Options'. You then need to set the 'Microsoft network server: Digitally sign communications' to disabled. It is enabled by default.