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I found that the firewall's built-in rules aren't always accurate and sufficient. I researched a little this subject once, and found this article. This are the ports the article says are generally required: UDP Port 88 for Kerberos authentication UDP and TCP Port 135 for domain controllers-to-domain controller and client to domain controller operations. ...


To find the root cause of account lockout, you need to get logon failure event information where its get originated. See the below articles To track Account Lockout Source for different Logon Types. Logon Type 3: http://www.morgantechspace.com/2014/11/How-to-Find-Account-Lockout-Source-for-Logon-Type-3.html Logon Type 8: ...

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