I need to know if possible, what is the best authentication method to use to connect the AD server with the mcafee web gateway appliance? NTLM, LDAP ...? According to which criterion should we choose the appropriate method?
Quite often NTLM is used with AD servers. I don't think someone can give you a general advice on this, this decision you might have to take for your company based on what your applications support.
We use Kerberos with fallback to NTLM for clients which does not support Kerberos auth.
This is based on our security dept. request and is documented on MWG forum. I guess there is example ruleset in rule set library.