{"id":2876,"date":"2017-11-08T12:19:53","date_gmt":"2017-11-08T18:19:53","guid":{"rendered":"https:\/\/kevinjustin.com\/blog\/?p=2876"},"modified":"2019-12-20T12:53:10","modified_gmt":"2019-12-20T16:53:10","slug":"schannel-event-logging","status":"publish","type":"post","link":"https:\/\/kevinjustin.com\/blog\/2017\/11\/08\/schannel-event-logging\/","title":{"rendered":"SCHANNEL event logging"},"content":{"rendered":"<p>First, my thanks to Bhuvnesh Kumar for his help!<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2936\" src=\"https:\/\/kevinjustin.com\/blog\/wp-content\/uploads\/2017\/11\/Oz-Behind-the-curtain.jpg\" alt=\"\" width=\"306\" height=\"198\" \/><\/p>\n<p>Time to figure out what&#8217;s going on behind the curtain!<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Are you seeing System Event Log, Event ID 36871 events?<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Why does this matter?<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>Depending on OS versions and patches, the TLS Cipher Suites may not match on the various SCOM servers.<\/p>\n<ol>\n<li>If you&#8217;re setting up TLS1.2, you need the SCOM servers to talk<\/li>\n<li>The bad part, is this isn&#8217;t logged much on the GW but log more often on MS<\/li>\n<li>Sometimes the 36871 events come with 36874, but in my experience they occur after Event Logging is enabled.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>The unanswered question is &#8220;why are we seeing the 36871 events?&#8221;<\/p>\n<p>&nbsp;<\/p>\n<p>In my example, the events only happened once a day, roughly 24 hours<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Event Viewer<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2976\" src=\"https:\/\/kevinjustin.com\/blog\/wp-content\/uploads\/2017\/11\/System-Event-ID-36871.PNG\" alt=\"\" width=\"840\" height=\"645\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Are events related to the Cipher Suite, or is it a MP trying to run the old SQLOLEDB method?<\/p>\n<p>&nbsp;<\/p>\n<p>This article will focus on verifying Cipher Suite on a server<\/p>\n<p>See this <a href=\"https:\/\/kevinjustin.com\/blog\/?p=2986&amp;preview=true\" target=\"_blank\" rel=\"noopener noreferrer\">article<\/a> for MP analysis for SQL methods<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>SCHANNEL event logging setup<\/h2>\n<p>&nbsp;<\/p>\n<p>From Holman&#8217;s <a href=\"https:\/\/kevinholman.com\/2018\/05\/06\/implementing-tls-1-2-enforcement-with-scom\/\" target=\"_blank\" rel=\"noopener noreferrer\">blog<\/a><\/p>\n<table border=\"1\" width=\"520\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"bottom\" width=\"56\">Decimal<\/td>\n<td valign=\"bottom\" width=\"462\">Description<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"57\">0<\/td>\n<td valign=\"bottom\" width=\"466\">Do not log<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"58\">1<\/td>\n<td valign=\"bottom\" width=\"465\">Log Error messages<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"59\">2<\/td>\n<td valign=\"bottom\" width=\"464\">Log Warnings<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"60\">3<\/td>\n<td valign=\"bottom\" width=\"463\">Log Error and Warning messages<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"61\">4<\/td>\n<td valign=\"bottom\" width=\"462\">Log Informational and Success events<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"62\">5<\/td>\n<td valign=\"bottom\" width=\"461\">Log Error, Informational and Success events<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"63\">6<\/td>\n<td valign=\"bottom\" width=\"460\">Log Warnings, Informational and Success events<\/td>\n<\/tr>\n<tr>\n<td valign=\"bottom\" width=\"64\">7<\/td>\n<td valign=\"bottom\" width=\"459\">Log Everything (Warnings, Errors, Informational and Success events<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>I\u2019d recommend setting it to 3 to see errors and warnings, or 7 to see everything.<\/p>\n<p>Remember to set this back to 1 when done resolving any issues.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Add<\/strong><\/p>\n<p>From Command Prompt or PowerShell (as administrator)<\/p>\n<p><span style=\"color: #3366ff;\">reg add &#8220;HKLM\\SYSTEM\\CurrentControlSet\\Control\\SecurityProviders\\SCHANNEL&#8221; \/v &#8220;EventLogging&#8221; \/t REG_DWORD \/d 7 \/f<\/span><\/p>\n<p><strong>Disable<\/strong><\/p>\n<p><span style=\"color: #3366ff;\">reg delete &#8220;HKLM\\SYSTEM\\CurrentControlSet\\Control\\SecurityProviders\\SCHANNEL&#8221; \/v &#8220;EventLogging&#8221;<\/span><\/p>\n<p><strong>Verification<\/strong><\/p>\n<p><span style=\"color: #3366ff;\">reg query &#8220;HKLM\\SYSTEM\\CurrentControlSet\\Control\\SecurityProviders\\SCHANNEL&#8221; \/v &#8220;EventLogging&#8221;<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>PowerShell verification<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2947\" src=\"https:\/\/kevinjustin.com\/blog\/wp-content\/uploads\/2017\/11\/SCHANNEL-Event-Logging-PowerShell.png\" alt=\"\" width=\"956\" height=\"62\" \/><\/p>\n<p><strong>RegEdit Verification<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2937\" src=\"https:\/\/kevinjustin.com\/blog\/wp-content\/uploads\/2017\/11\/RegEditor-EventLogging.png\" alt=\"\" width=\"768\" height=\"526\" \/><\/p>\n<p>Time to\u00a0reboot!<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>Verify SCHANNEL events<\/h2>\n<p>Look at the System Event log, and filter for 36880 and 36874 events for clues<\/p>\n<p>&nbsp;<\/p>\n<p>36880 provides Cipher Suite details<\/p>\n<p><span style=\"color: #3366ff;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2916\" src=\"https:\/\/kevinjustin.com\/blog\/wp-content\/uploads\/2017\/11\/MS-Event.png\" alt=\"\" width=\"630\" height=\"616\" \/> <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #3366ff;\"><span style=\"color: #000000;\">Event ID 36874 definitely describes the scenario<\/span><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2975\" src=\"https:\/\/kevinjustin.com\/blog\/wp-content\/uploads\/2017\/11\/SystemEventID36874-TLS1.2.PNG\" alt=\"\" width=\"1284\" height=\"227\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2967\" src=\"https:\/\/kevinjustin.com\/blog\/wp-content\/uploads\/2017\/11\/SystemEventID36874.PNG\" alt=\"\" width=\"1290\" height=\"352\" \/> <\/span><\/p>\n<p>&nbsp;<\/p>\n<p>The easy answer to solve the cipher suite is to ask &#8211; is this server patched with latest security and .NET patches?<\/p>\n<p>After all this, in my example, we confirmed that simple step was assumed, and inaccurate.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>References<\/strong><br \/>\n36871 event <a href=\"https:\/\/docs.microsoft.com\/en-us\/previous-versions\/windows\/it-pro\/windows-server-2012-R2-and-2012\/dn786445(v=ws.11)\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.microsoft.com\/en-us\/previous-versions\/windows\/it-pro\/windows-server-2012-R2-and-2012\/dn786445(v=ws.11)<\/a><\/p>\n<p>SCHANNEL events <a href=\"https:\/\/docs.microsoft.com\/en-us\/previous-versions\/windows\/it-pro\/windows-server-2012-R2-and-2012\/dn786445(v=ws.11)\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.microsoft.com\/en-us\/previous-versions\/windows\/it-pro\/windows-server-2012-R2-and-2012\/dn786445(v=ws.11)<\/a><\/p>\n<p>SChannel error codes <a href=\"https:\/\/docs.microsoft.com\/en-us\/windows\/win32\/secauthn\/schannel-error-codes-for-tls-and-ssl-alerts target=\" rel=\"noopener noreferrer\">https:\/\/docs.microsoft.com\/en-us\/windows\/win32\/secauthn\/schannel-error-codes-for-tls-and-ssl-alerts<\/a><\/p>\n<p>SChannel events <a href=\"https:\/\/docs.microsoft.com\/en-us\/previous-versions\/windows\/it-pro\/windows-server-2012-R2-and-2012\/dn786445(v=ws.11)\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.microsoft.com\/en-us\/previous-versions\/windows\/it-pro\/windows-server-2012-R2-and-2012\/dn786445(v=ws.11)<\/a><\/p>\n<p>SSL errors <a href=\"https:\/\/www.experts-exchange.com\/questions\/28996780\/event-id-36871-Schannel.html\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/www.experts-exchange.com\/questions\/28996780\/event-id-36871-Schannel.html<\/a><\/p>\n<p>Troubleshooting <a href=\"https:\/\/docs.microsoft.com\/en-us\/iis\/troubleshoot\/security-issues\/troubleshooting-ssl-related-issues-server-certificate\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/docs.microsoft.com\/en-us\/iis\/troubleshoot\/security-issues\/troubleshooting-ssl-related-issues-server-certificate<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>First, my thanks to Bhuvnesh Kumar for his help! &nbsp; Time to figure out what&#8217;s going on behind the curtain! &nbsp; &nbsp; Are you seeing System Event Log, Event ID 36871 events? &nbsp; Why does this matter? &nbsp; Depending on OS versions and patches, the TLS Cipher Suites may not match on the various SCOM &hellip; <a href=\"https:\/\/kevinjustin.com\/blog\/2017\/11\/08\/schannel-event-logging\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;SCHANNEL event logging&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,11],"tags":[27,89,213,341,342,349,445,446,456],"class_list":["post-2876","post","type-post","status-publish","format-standard","hentry","category-administration","category-troubleshooting","tag-admin","tag-cipher-suite","tag-logging","tag-schannel","tag-scom","tag-scom-2016","tag-tls","tag-tls1-2","tag-troubleshooting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SCHANNEL event logging - Kevin Justin&#039;s Blog<\/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:\/\/kevinjustin.com\/blog\/2017\/11\/08\/schannel-event-logging\/\" \/>\n<meta property=\"og:locale\" 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