Active Directory block accounts of some of my users

Hi
We have a Windows 2003 Server with AD running in two servers with Microsoft Exchange Server in one of them. After about one month all our accounts come blocked every morning and severall times by day by the Active Directory himself.
We have all the licencensing process ok and service "License Logging Server" running ok.
Why this happens ? How to solve the situation ?
Can you help please ?
Thank you very mutch Raul
raulcordAsked:
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.

MidnightOneCommented:
What do you mean by all accounts become blocked? Users are unable to log in? What error message, if any, do they get?
0
admin_lbpsbCommented:
Sounds like a virus to me. Have a look at Event Viewer, Security for Event ID 644 (locked out accounts) on both AD servers. The event will list the computer trying to log in.
0
DarrenJLCommented:
It does sound a lot like the Conficker worm (http://support.microsoft.com/kb/962007) but it could also be something else.

We use a proxy server to protect our users from the web and occasionally this locks certain users out. One user (Web development) uses Safari as one of their web browsers and that tries multiple times to connect to the web through the proxy server, after the 10th attempt it locks the users account and requires a member of IT to unlock it again.

Our Proxy server is connected via LDAP to our AD infrastructure.

Darren
0

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
raulcordAuthor Commented:
Thank you very mutch
0
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
Active Directory

From novice to tech pro — start learning today.