


{"id":462563,"date":"2026-08-13T02:36:23","date_gmt":"2026-08-13T02:36:23","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-student-2026-r1-flexnet-error-88309-system-clock-has-been-set-back\/"},"modified":"2026-08-13T02:36:23","modified_gmt":"2026-08-13T02:36:23","slug":"ansys-student-2026-r1-flexnet-error-88309-system-clock-has-been-set-back","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-student-2026-r1-flexnet-error-88309-system-clock-has-been-set-back\/","title":{"rendered":"Ansys Student 2026 R1 \u2013 FlexNet Error -88,309 \u201cSystem clock has been set back\u201d"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I am using <strong>Ansys Student 2026 R1 on Windows 11<\/strong>, and I am having a persistent licensing issue.<\/p>\n<p>When I launch <strong>Ansys Fluent 2026 R1<\/strong>, the console shows:<\/p>\n<p><code>Unexpected license problem; exiting.<\/code><\/p>\n<p>Earlier, I generated Ansys Diagnostics, and the Fluent licensing log showed:<\/p>\n<p><code>DENIED cfd_preppost<\/code><br \/><code>System clock has been set back.<\/code><br \/><code>FlexNet Licensing error: -88,309<\/code><\/p>\n<p>My Windows date, time, and time zone are currently correct and automatically synchronized.<\/p>\n<p>Previously, while installing another software package, I temporarily changed the Windows system date to a future year and later restored it to the correct date. I believe this may have triggered the FlexNet clock rollback detection.<\/p>\n<p>I have already performed the following troubleshooting steps:<\/p>\n<ul>\n<li>\n<p>Removed the software associated with the future timestamps<\/p>\n<\/li>\n<li>\n<p>Removed many files with future timestamps<\/p>\n<\/li>\n<li>\n<p>Reset Ansys\/Fluent user configuration files<\/p>\n<\/li>\n<li>\n<p>Completely uninstalled Ansys Student 2026 R1<\/p>\n<\/li>\n<li>\n<p>Removed remaining Ansys folders and user configuration files<\/p>\n<\/li>\n<li>\n<p>Reinstalled Ansys Student 2026 R1 from a fresh official installer<\/p>\n<\/li>\n<li>\n<p>Rebooted Windows after installation<\/p>\n<\/li>\n<\/ul>\n<p>However, the problem still remains.<\/p>\n<p>After the clean reinstall:<\/p>\n<ul>\n<li>\n<p><strong>Fluent still exits with <code>Unexpected license problem; exiting.<\/code><\/strong><\/p>\n<\/li>\n<li>\n<p><strong>Mechanical opens in <code>Read-Only Configuration<\/code><\/strong><\/p>\n<\/li>\n<li>\n<p>Mechanical displays: <code>The shared license is not available to perform the Geometry Attach operation.<\/code><\/p>\n<\/li>\n<\/ul>\n<p>I am using the <strong>free Ansys Student version<\/strong>, not a university network license, and Network Licensing is disabled.<\/p>\n<p>Could you please advise how to clear or reset the FlexNet clock rollback detection?<\/p>\n<p>If there is an official <strong>datefix utility or recovery procedure for Ansys Student 2026 R1<\/strong>, could you please provide it?<\/p>\n<p>I cannot attach the Diagnostics ZIP file to the forum, but I can provide specific log contents if needed.<\/p>\n<p>Thank you.<\/p>\n","protected":false},"template":"","class_list":["post-462563","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I am using Ansys Student 2026 R1 on Windows 11, and I am having a persistent licensing issue. 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When I launch Ansys Fluent 2026 R1, the console shows: Unexpected license problem; exiting. Earlier, I generated Ansys Diagnostics, and the Fluent licensing log showed: DENIED cfd_preppostSystem clock has been set back.FlexNet Licensing error: -88,309 My","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-student-2026-r1-flexnet-error-88309-system-clock-has-been-set-back\/","article:published_time":"2026-08-13T02:36:23+00:00","article:modified_time":"2026-08-13T02:36:23+00:00","twitter:card":"summary_large_image","twitter:title":"Ansys Student 2026 R1 \u2013 FlexNet Error -88,309 \u201cSystem clock has been set back\u201d | Ansys Learning Forum","twitter:description":"Hello, I am using Ansys Student 2026 R1 on Windows 11, and I am having a persistent licensing issue. When I launch Ansys Fluent 2026 R1, the console shows: Unexpected license problem; exiting. Earlier, I generated Ansys Diagnostics, and the Fluent licensing log showed: DENIED cfd_preppostSystem clock has been set back.FlexNet Licensing error: -88,309 My"},"aioseo_meta_data":[],"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tAnsys Student 2026 R1 \u2013 FlexNet Error -88,309 \u201cSystem clock has been set back\u201d\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"Ansys Student 2026 R1 \u2013 FlexNet Error -88,309 \u201cSystem clock has been set back\u201d","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-student-2026-r1-flexnet-error-88309-system-clock-has-been-set-back\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27794"],"_bbp_topic_id":["462563"],"_bbp_subscription":["718896"],"_bbp_author_ip":[null],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["462563"],"_bbp_last_active_time":["2026-08-13 02:46:02"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_engagement":["1"],"_bbp_likes_count":["0"],"_btv_view_count":["40"],"application":["FLUENT"],"emailnotification":[null],"_bbp_topic_status":["unanswered"]},"test":"noyongpalseoultech-ac-kr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/462563","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/462563\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=462563"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}