{"id":1561,"date":"2009-11-19T12:30:04","date_gmt":"2009-11-19T12:30:04","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/2009\/11\/mark-russinovich-explains-the-machine-sid-duplication-myth.htm"},"modified":"2009-11-19T12:30:46","modified_gmt":"2009-11-19T12:30:46","slug":"mark-russinovich-explains-the-machine-sid-duplication-myth","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2009\/11\/mark-russinovich-explains-the-machine-sid-duplication-myth.htm","title":{"rendered":"Mark Russinovich explains &#8220;the machine SID duplication myth&#8221;"},"content":{"rendered":"<p>One of my colleagues just flagged a blog post I&#8217;d been meaning to read when I have a little more time from Microsoft (ex-SysInternals) Technical Fellow Mark Russinovich in which he discusses &#8220;<a href=\"http:\/\/blogs.technet.com\/markrussinovich\/archive\/2009\/11\/03\/3291024.aspx\">the machine SID duplication myth<\/a>&#8220;.  It seems that all of the effort we put into de-duplicating SIDs on Windows NT-based systems (NT, 2000, XP, 2003, Vista, 2008, 7 and 2008 R2) over the years was not really required&#8230;<\/p>\n<p>To be honest, I don&#8217;t think anyone ever said it was required &#8211; just that having multiple machines with the same security identifier sounded like a problem waiting to happen and that generating unique SIDs was best practice.<\/p>\n<p>The full post is worth a read but, in summary, the new best practice is:<\/p>\n<blockquote cite=\"http:\/\/blogs.technet.com\/markrussinovich\/archive\/2009\/11\/03\/3291024.aspx\"><p>&#8220;Microsoft\u00e2\u20ac\u2122s official policy on SID duplication will also now change and look for Sysprep to be updated in the future to skip SID generation as an option. Note that Sysprep resets other machine-specific state that, if duplicated, can cause problems for certain applications like Windows Server Update Services (WSUS), so Microsoft\u00e2\u20ac\u2122s support policy will still require cloned systems to be made unique with Sysprep.&#8221;<\/p><\/blockquote>\n<p>As you were then&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of my colleagues just flagged a blog post I&#8217;d been meaning to read when I have a little more time from Microsoft (ex-SysInternals) Technical Fellow Mark Russinovich in which he discusses &#8220;the machine SID duplication myth&#8220;. It seems that all of the effort we put into de-duplicating SIDs on Windows NT-based systems (NT, 2000, &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2009\/11\/mark-russinovich-explains-the-machine-sid-duplication-myth.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Mark Russinovich explains &#8220;the machine SID duplication myth&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[33],"class_list":["post-1561","post","type-post","status-publish","format-standard","hentry","tag-windows"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mark Russinovich explains &quot;the machine SID duplication myth&quot; - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2009\/11\/mark-russinovich-explains-the-machine-sid-duplication-myth.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mark Russinovich explains &quot;the machine SID duplication myth&quot; - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"One of my colleagues just flagged a blog post I&#8217;d been meaning to read when I have a little more time from Microsoft (ex-SysInternals) Technical Fellow Mark Russinovich in which he discusses &#8220;the machine SID duplication myth&#8220;. 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