Author: Krishnamoorthi

Avoid enabling Kerberos Pre-Authentication in AD

Kerberos Pre-Authentication The Key Distribution Center (KDC) is available as part of the domain controller and performs two key functions which are: Authentication Service (AS) and┬áTicket-Granting Service (TGS) By default the KDC requires all accounts to use pre-authentication. This is a security feature which offers protection against password-guessing attacks.┬áThe AS request identifies the client to…
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November 11, 2021 0

Event ID 5807 : Connections to this Domain Controller from client machines whose IP addresses don’t map to any of existing sites

Summary When client subnets are missing from active directory Sites and Services that results client to choose a incorrect domain controllers to communicate effectively with Directory Services. During DC localization process, Computer IP address matches against the subnets created in AD which helps to identify the subnet where client belongs to. If the DC cannot…
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 2,467 total views,  3 views today

August 24, 2021 0

Remote Desktop Connection failures and fixes

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 1,073 total views

August 17, 2021 0

AD Replication using Repadmin & Powershell cmdlets

The Repadmin tool Repadmin.exe is a command-line tool available if you’ve installed the Active Directory role; otherwise, you have to install Remote Server Administration Tools (RSAT). The output is usually in text form. If you have to customize the format of the output, things can get time consuming. In the example that follows, Repadmin triggers…
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August 17, 2021 0