{"id":6945,"date":"2017-02-17T16:07:51","date_gmt":"2017-02-17T16:07:51","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/?p=6945"},"modified":"2017-02-17T16:14:54","modified_gmt":"2017-02-17T16:14:54","slug":"missing-office-365-icons-blocking-untrusted-fonts-windows-10","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2017\/02\/missing-office-365-icons-blocking-untrusted-fonts-windows-10.htm","title":{"rendered":"Missing Office 365 icons after blocking untrusted fonts in Windows 10"},"content":{"rendered":"<p>One of my customers contacted me recently to ask about a challenge they had seen with Windows 10. After blocking untrusted fonts in Windows 10, they noticed that parts of the\u00a0Office 365 portal were missing icons.<\/p>\n<h3>The problem<\/h3>\n<p>The issue is that Office 365 uses a font\u00a0to display icons\/glyphs (to improve the experience when scaling to adapt to different screen sizes).\u00a0It appears some browsers are unable to display the embedded fonts\u00a0when they are untrusted &#8211; <a href=\"https:\/\/jprudente.wordpress.com\/2016\/02\/02\/ie11-on-windows-10-not-displaying-certain-graphics\/\">including Internet Explorer according to one blog post<\/a> that my colleague <a href=\"https:\/\/www.gavin.pro\/\">Gavin Morrison<\/a> (<a href=\"http:\/\/twitter.com\/gavinmorrison\/\">@GavinMorrison<\/a>) found &#8211; apparently Edge has no such issues (though I can think of many more issues that it does have&#8230;) &#8211; Chrome also seemed to work for me.<\/p>\n<p>There&#8217;s <a href=\"https:\/\/technet.microsoft.com\/en-us\/itpro\/windows\/keep-secure\/block-untrusted-fonts-in-enterprise\">some good information about blocking untrusted fonts on TechNet<\/a>\u00a0and this highlights that:<\/p>\n<blockquote cite=\"https:\/\/technet.microsoft.com\/en-us\/itpro\/windows\/keep-secure\/block-untrusted-fonts-in-enterprise\"><p>\u201cUsing Internet Explorer to look at websites that use embedded fonts. In this situation, the feature blocks the embedded font, causing the website to use a default font. However, not all fonts have all of the characters, so the website might render differently.\u201d<\/p><\/blockquote>\n<h3>The fix<\/h3>\n<p>So, that appears to be the issue. What&#8217;s the fix?<\/p>\n<p>It seems there are two workarounds &#8211; one includes excluding processes from the font blocking (but it&#8217;s no good excluding a browser &#8211; as the most likely attack vector for a malicious font would be via a website!) and the other includes installing the problematic font to %windir%\\Fonts.<\/p>\n<h3>Tracking down the Office 365 font<\/h3>\n<p>So, where do you get hold of the Office 365 font? I thought it should be part of <a href=\"https:\/\/dev.office.com\/fabric\">the Office UI fabric<\/a> but I couldn&#8217;t find it there, nor any reference to it in <a href=\"https:\/\/dev.office.com\/docs\">the Office developer documentation<\/a>\u00a0(<a href=\"https:\/\/dev.office.com\/fabric#\/styles\/icons\">there are some icons in the fabric<\/a> &#8211; but they don&#8217;t seem to be the ones used for the Office 365 portal).<\/p>\n<p>There is a site where you can <a href=\"http:\/\/o365icons.cloudapp.net\/\">select Office 365 glyphs and download a font file<\/a>\u00a0but I&#8217;m not sure that will address the issue with the Office 365 fonts being blocked in the portal, so some more detective work was required&#8230;<\/p>\n<p><a href=\"http:\/\/www.n8d.at\/blog\/office-365-icon-font-documentation\/\">Stefan Bauer has posted quite a lot of information\u00a0on the Office 365 fonts<\/a>\u00a0(there&#8217;s <a href=\"http:\/\/lab.n8d.at\/o365glyph\/index.html\">more in his &#8220;lab&#8221;<\/a>) but it seems the CDN location Stefan highlights has changed. <a href=\"https:\/\/thomasdaly.net\/2015\/06\/24\/office-365-icons\/\">Thomas Daly found some new locations<\/a>\u00a0(and helpfully hosts a copy of the font on his site) but I wanted to signpost my customer to a Microsoft-provided source.<\/p>\n<p>One of the locations that Thomas highlights is https:\/\/outlook.office365.com\/owa\/prem\/16.0.772.13\/resources\/styles\/fonts\/office365icons.ttf but that results in an HTTP Error 404 now (not found). So I opened the Office 365 portal in my browser and started the Debugger. Then, I found the following line of code that gave me a clue:<\/p>\n<p><code>&lt;meta name=\"msapplication-TileImage\" content=\"https:\/\/r1.res.office365.com\/owa\/prem\/16.1630.11.2221454\/resources\/images\/0\/owa_browserpinnedtile.png\"\/&gt;<\/code><\/p>\n<p>I used that base location (up to and including the version number) with the tail end of the URI that Thomas had provided and was pleased to find that https:\/\/r1.res.office365.com\/owa\/prem\/16.1630.11.2221454\/resources\/styles\/fonts\/office365icons.ttf got me to an installable TrueType font file for the Office 365 fonts on Windows.<\/p>\n<p>I expect the location to change again as the version number is updated but the method of tracking down the file should be repeatable.<\/p>\n<h3>Testing my theory<\/h3>\n<p>Testing on one of my PCs with HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Kernel\\MitigationOptions set to 0x1000000000000 resulted in Internet Explorer loading the Office 365 portal without icons and\u00a0Event ID 260 recorded in the Microsoft-Windows-Win32k\/Operational log:<\/p>\n<p><em>C:\\Program Files (x86)\\Internet Explorer\\iexplore.exe attempted loading a font that is restricted by font loading policy.<\/em><br \/>\n<em>FontType: Memory<\/em><br \/>\n<em>FontPath:<\/em><\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/o365fonts-blocked.png?resize=503%2C356&#038;ssl=1\" alt=\"Office 365 fonts blocked - missing icons\" width=\"503\" height=\"356\" \/><\/p>\n<p>After installing the Office 365 icons font (office365icons.ttf) and refreshing the page, I was able to view the icons:<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/o365fonts-allowed.png?resize=503%2C356&#038;ssl=1\" alt=\"Office 365 fonts installed - icons visible\" width=\"503\" height=\"356\" \/><\/p>\n<p>Uninstalling the font locally and refreshing once more took me back to missing icons.<\/p>\n<p>I then tidied up by setting the MitigationOptions registry key to 0x2000000000000 and restarting the PC, before removing the registry entry completely.<\/p>\n<h3>Further reading<\/h3>\n<p><a href=\"http:\/\/www.ghacks.net\/2016\/02\/05\/block-programs-from-loading-untrusted-fonts-in-windows-10\/\">Block programs from loading untrusted fonts in Windows 10<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of my customers contacted me recently to ask about a challenge they had seen with Windows 10. After blocking untrusted fonts in Windows 10, they noticed that parts of the\u00a0Office 365 portal were missing icons. The problem The issue is that Office 365 uses a font\u00a0to display icons\/glyphs (to improve the experience when scaling &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2017\/02\/missing-office-365-icons-blocking-untrusted-fonts-windows-10.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Missing Office 365 icons after blocking untrusted fonts in Windows 10<\/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":[218],"tags":[217,586,43],"class_list":["post-6945","post","type-post","status-publish","format-standard","hentry","category-technology","tag-office-365","tag-windows-10","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Missing Office 365 icons after blocking untrusted fonts in Windows 10 - markwilson.it<\/title>\n<meta name=\"description\" content=\"After blocking untrusted fonts in Windows 10 some browsers may not show icons in the Office 365 portal. This post describes the issue and a workaround\" \/>\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\/2017\/02\/missing-office-365-icons-blocking-untrusted-fonts-windows-10.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Missing Office 365 icons after blocking untrusted fonts in Windows 10 - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"After blocking untrusted fonts in Windows 10 some browsers may not show icons in the Office 365 portal. 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During a career spanning more than two decades, Mark has gained widespread recognition as an expert in his field including both industry and national press exposure. In addition to certifications from Microsoft, VMware, Red Hat, The Open Group and Axelos, Mark held a Microsoft Most Valuable Professional (MVP) award for three years and is now part of the MVP Reconnect programme. 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Check the client firewall","author":"Mark Wilson","date":"Saturday 26 October 2013","format":false,"excerpt":"I've written previously about managing my Office 365 tenant using Windows PowerShell\u00a0(Microsoft has since provided its own documentation on the topic) but I tried today and found that I couldn't get a connection. Every time I tried to create a session, the response came back as: [ps.outlook.com] Connecting to remote\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/powershell-office365.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/powershell-office365.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/powershell-office365.png?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":8306,"url":"https:\/\/www.markwilson.co.uk\/blog\/2021\/07\/notes-from-the-field-some-common-dependencies-for-microsoft-365-deployments.htm","url_meta":{"origin":6945,"position":2},"title":"Notes from the field: some common dependencies for Microsoft 365 deployments","author":"Mark Wilson","date":"Monday 19 July 2021","format":false,"excerpt":"My blog posts take a while to get published these days. I struggle to find the time to write them and often a few notes can remain in draft form for a long time. Some of those notes never make it. Others possibly shouldn't. 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Windows 10 shortcuts and other productivity guides A few days ago, I added a link to my delicious account\u00a0with a useful list of shortcut keys for Windows 10. 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