AD offline login, how to reduce login time?

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http://forums.opensuse.org – We have a Suse machine on a windows domain which has the offline login option enabled so you just use your domain user pass even when your not connected to the domain to connect locally. Problem is it takes about a minute and a half to login when your off site. I guess the login is repeatedly trying to contact the domain controller, is there any way to shorten this time period? many thanks Tea (Distributions)