Samba application unable to authenticate with Win 2008 R2 DC's

We have Windows 2008 R2 DC's setup last week.
 All Win 2003 Dc's were decommed and Win 2008 R2 DC's were put in environemnt.
 After this, application team (UNIX based) who were using SAMBA app to communicate with DC's had issues and had error connecting / authneticating new DC's.
 App team is using Samba version 3.0.2.
 Need to address this issue on URGENT basis.
 Can we do this without upgrading SAMBA app to latest version?
 Any help / links / suggestions would be highly appreciated.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

David Johnson, CD, MVPOwnerCommented:
check this article out and see if it helps you
Andrew OakeleyConsultantCommented:
Try disabling SMB signing on the 2008 DC's
ex_adAuthor Commented:

Solution for this issue is to upgrade SAMBA version to leatest supported by Win 2k8

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ex_adAuthor Commented:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows Server 2008

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.