I usually authenticate users from Active Directory using System.Directory.Protocols via C#. I am able to authenticate many users with the same connection without any issues. But the kind of problem that I have is different. When I am trying to reset a users password and try to authenticate this user using the previous password, instead of getting a message that should tell me that my credentials are invalid, I am getting "The LDAP server is unavailable" error message. After that I am getting the same error message for each user I try to authenticate.The only fix for this problem is to open a new connection. Is there anyone with some other ideas? Thanks.
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