WSUS and the Domain Controller
On first glance it might be tempting on smaller networks to put the Windows Server Update Services (WSUS) on the DC; it won't drag that much performance, right? But no, according to MSDN the impact will be "If WSUS is installed a domain controller, this will cause database access issues due to how the database is configured." Sources: WSUS: WSUS should be installed on a non-domain controller Guidance about WSUS on a Domain Controller Step by Step : Installing & Configuring WSUS in Server 2012 R2 Step by Step : Installing & Configuring WSUS in Server 2012 R2, Comment Keywords: Windows Server 2012 R2, Updates, WSUS, Domain Controller