Cross AD authentication on two servers

Currently we have got one web server on which all the applications resides.
We are thinking to shift some of our applications onto other server so may be first server will be called and the second one will be called
What i want to do is if the user logsd in on server1 and then if he clicks on some link that takes him to the second server, then he should not be asked to login again as the user was already authenticated on the first server and vice-versa if he logins first from second server and goes onto first server.
How do i achieve the above.
Our website is in and sql server 2008 r2 with the 2008 r2 operating system.
Who is Participating?
Neil RussellConnect With a Mentor Technical Development LeadCommented:
Your question IMPLIED that both servers were on the same domain..

"first server will be called and the second one will be called"

If on seperate domains you will need a trust relationship between the domains.
Neil RussellTechnical Development LeadCommented:
Are you talking about AD logins or Website logins?
IF Ad then he should never be asked.
Mike ThomasConsultantCommented:
Put both machines into the same domain and use the same account for authentication, this is the best way but will require a domain controller, as you have added the question to the active directory zone i am assuming this is an option for you?
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VCKings01Author Commented:
Its Ad authentication
Mike ThomasConsultantCommented:
Then you need to assign the permissions for the user/group to the right files/folder and the servers and have the user log on to the serer or workstation with the correct account.
VCKings01Author Commented:
Is it possible if it is on different domains?
Mike ThomasConsultantCommented:
Only if theire is a trust relationship between the domains or the guest account is being used (which has associated risks)
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