{"id":18207,"date":"2026-09-01T03:03:46","date_gmt":"2026-08-31T18:03:46","guid":{"rendered":"https:\/\/m365jp.net\/?p=18207"},"modified":"2026-09-01T03:05:43","modified_gmt":"2026-08-31T18:05:43","slug":"mc1465017-reminder-configure-firewall-and-proxies-for-smooth-windows-updates","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-09-01-mc1465017-reminder-configure-firewall-and-proxies-for-smooth-windows-updates","title":{"rendered":"MC1465017 | Reminder: Configure firewall and proxies for smooth Windows updates"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">MC1465017 | Reminder: Configure firewall and proxies for smooth Windows updates<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<table id=\"data\">\n<tbody>\n<tr>\n<th>Classification<\/th>\n<td>stayInformed<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>08\/31\/2026 17:10:04<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>08\/31\/2026 17:10:02<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>08\/31\/2027 17:10:02<\/td>\n<\/tr>\n<tr>\n<th>Message Content<\/th>\n<td>\n<div><b>What and why<\/b><\/div>\n<div>By design, Windows Update doesn&#8217;t trust servers that don&#8217;t have TLS certificates issued by an actual Windows Update trust anchor. We published guidance in May 2026 to help you diagnose and fix connection issues that result from this design.<\/div>\n<div>  <\/div>\n<div><b>Rollout schedule<\/b><\/div>\n<ul>\n<li>This guidance was published in May to help with ongoing troubleshooting.<\/li>\n<li>Connection issues might be ongoing until you apply the existing solution.<\/li>\n<\/ul>\n<div>  <\/div>\n<div><b>Impact on your organization<\/b><\/div>\n<div>Your firewalls and proxies might block access to the trustworthy and necessary Windows Update service if your configuration is either intercepting TLS connections or isn&#8217;t passing TLS requests through for the necessary DNS subdomains. The published guide   helps you diagnose and fix related issues.<\/div>\n<div>  <\/div>\n<div><b>Action required\/recommendations<\/b><\/div>\n<div>Diagnose connection issues by checking the <a href=\"https:\/\/learn.microsoft.com\/powershell\/module\/windowsupdate\/get-windowsupdatelog?view=windowsserver2025-ps\" rel=\"noopener noreferrer\" target=\"_blank\">  Windows Update audit log<\/a>. <a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/configuring-firewall-and-proxies-for-smooth-windows-updates\/4517913\" rel=\"noopener noreferrer\" target=\"_blank\">  Our detailed guidance<\/a> lists the recommended PowerShell command and four error codes that can confirm the issue.<\/div>\n<div>  <\/div>\n<div>To remedy the situation, trust all the DNS hosts and subdomains related to wildcard FQDN for the connection to work properly. For example, a recommended DNS host name *.update.microsoft.com represents all the following hosts and subdomains:<\/div>\n<ul>\n<li>update.microsoft.com<\/li>\n<li>sls.update.microsoft.com<\/li>\n<li>tas02.sls.update.microsoft.com<\/li>\n<\/ul>\n<div>  <\/div>\n<div>Update your proxy and firewall configurations if any of these subdomains are missing. If your devices connect to an IT-managed Windows Server Update Services (WSUS) server, these exceptions aren&#8217;t necessary.<\/div>\n<div>  <\/div>\n<div><b>Compliance considerations<\/b><\/div>\n<div>Devices that cannot reach the <a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/configuring-firewall-and-proxies-for-smooth-windows-updates\/4517913\" rel=\"noopener noreferrer\" target=\"_blank\">  <u>Windows Update<\/u><\/a> service will stop receiving security updates.<\/div>\n<div>  <\/div>\n<div><b>Additional information<\/b><\/div>\n<ul>\n<li><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/configuring-firewall-and-proxies-for-smooth-windows-updates\/4517913\" rel=\"noopener noreferrer\" target=\"_blank\">Configuring firewall and proxies for smooth Windows updates<\/a><\/li>\n<li><a href=\"https:\/\/learn.microsoft.com\/windows\/deployment\/update\/windows-update-security\" rel=\"noopener noreferrer\" target=\"_blank\">Windows Update security<\/a><\/li>\n<li><a href=\"https:\/\/learn.microsoft.com\/windows-server\/security\/tls\/transport-layer-security-protocol\" rel=\"noopener noreferrer\" target=\"_blank\">Transport Layer Security protocol<\/a><\/li>\n<li><a href=\"https:\/\/learn.microsoft.com\/windows\/privacy\/manage-windows-11-endpoints\" rel=\"noopener noreferrer\" target=\"_blank\">Connection endpoints for Windows 11 Enterprise<\/a><\/li>\n<li><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/scan-changes-and-certificates-add-security-for-windows-devices-using-wsus-for-up\/2053668\" rel=\"noopener noreferrer\" target=\"_blank\">Scan changes and certificates add security for Windows   devices using WSUS for updates<\/a><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td>\n<div><b>\u4f55\u3068\u306a\u305c<\/b><\/div>\n<div>\u8a2d\u8a08\u4e0a\u3001Windows Update\u306f\u5b9f\u969b\u306eWindows Update\u4fe1\u983c\u30a2\u30f3\u30ab\u30fc\u306b\u3088\u3063\u3066\u767a\u884c\u3055\u308c\u305fTLS\u8a3c\u660e\u66f8\u3092\u6301\u305f\u306a\u3044\u30b5\u30fc\u30d0\u30fc\u3092\u4fe1\u983c\u3057\u307e\u305b\u3093\u3002\u3053\u306e\u8a2d\u8a08\u306b\u8d77\u56e0\u3059\u308b\u63a5\u7d9a\u554f\u984c\u306e\u8a3a\u65ad\u3068\u4fee\u6b63\u3092\u652f\u63f4\u3059\u308b\u305f\u3081\u306e\u30ac\u30a4\u30c0\u30f3\u30b9\u30922026\u5e745\u6708\u306b\u516c\u958b\u3057\u307e\u3057\u305f\u3002<\/div>\n<div>  <\/div>\n<div><b>\u5c55\u958b\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb<\/b><\/div>\n<ul>\n<li>\u3053\u306e\u30ac\u30a4\u30c0\u30f3\u30b9\u306f\u3001\u7d99\u7d9a\u7684\u306a\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u652f\u63f4\u3059\u308b\u305f\u3081\u306b5\u6708\u306b\u516c\u958b\u3055\u308c\u307e\u3057\u305f\u3002<\/li>\n<li>\u63a5\u7d9a\u306e\u554f\u984c\u306f\u65e2\u5b58\u306e\u89e3\u6c7a\u7b56\u3092\u9069\u7528\u3059\u308b\u307e\u3067\u7d9a\u304f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<div>  <\/div>\n<div><b>\u7d44\u7e54\u3078\u306e\u5f71\u97ff<\/b><\/div>\n<div>\u69cb\u6210\u304cTLS\u63a5\u7d9a\u3092\u508d\u53d7\u3057\u305f\u308a\u3001\u5fc5\u8981\u306aDNS\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306eTLS\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u901a\u904e\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3084\u30d7\u30ed\u30ad\u30b7\u304c\u4fe1\u983c\u3067\u304d\u308b\u5fc5\u8981\u306aWindows Update\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u30ac\u30a4\u30c9\u306f\u3001\u95a2\u9023\u3059\u308b\u554f\u984c\u306e\u8a3a\u65ad\u3068\u4fee\u6b63\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/div>\n<div>  <\/div>\n<div><b>\u5fc5\u8981\u306a\u884c\u52d5\/\u63d0\u8a00<\/b><\/div>\n<div>\u63a5\u7d9a\u554f\u984c\u306e\u8a3a\u65ad\u306f <a href=\"https:\/\/learn.microsoft.com\/powershell\/module\/windowsupdate\/get-windowsupdatelog?view=windowsserver2025-ps\" rel=\"noopener noreferrer\" target=\"_blank\">  \u3001Windows Update\u76e3\u67fb\u30ed\u30b0<\/a>\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002 <a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/configuring-firewall-and-proxies-for-smooth-windows-updates\/4517913\" rel=\"noopener noreferrer\" target=\"_blank\">  \u8a73\u7d30\u306a\u30ac\u30a4\u30c0\u30f3\u30b9\u3067\u306f<\/a> \u63a8\u5968\u3055\u308c\u308bPowerShell\u30b3\u30de\u30f3\u30c9\u3068\u3001\u554f\u984c\u3092\u78ba\u8a8d\u3067\u304d\u308b4\u3064\u306e\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/div>\n<div>  <\/div>\n<div>\u3053\u306e\u72b6\u6cc1\u3092\u6539\u5584\u3059\u308b\u305f\u3081\u306b\u3001\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9FQDN\u306b\u95a2\u9023\u3059\u308b\u3059\u3079\u3066\u306eDNS\u30db\u30b9\u30c8\u304a\u3088\u3073\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u4fe1\u983c\u3057\u3066\u63a5\u7d9a\u3092\u6b63\u5e38\u306b\u6a5f\u80fd\u3055\u305b\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u63a8\u5968\u3055\u308c\u308bDNS\u30db\u30b9\u30c8\u540d*.update.microsoft.com \u306f\u4ee5\u4e0b\u306e\u3059\u3079\u3066\u306e\u30db\u30b9\u30c8\u304a\u3088\u3073\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u8868\u3057\u307e\u3059\u3002<\/div>\n<ul>\n<li>update.microsoft.com<\/li>\n<li>sls.update.microsoft.com<\/li>\n<li>tas02.sls.update.microsoft.com<\/li>\n<\/ul>\n<div>  <\/div>\n<div>\u3053\u308c\u3089\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u304c\u6b20\u3051\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30d7\u30ed\u30ad\u30b7\u3084\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306e\u8a2d\u5b9a\u3092\u66f4\u65b0\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3082\u3057\u30c7\u30d0\u30a4\u30b9\u304cIT\u7ba1\u7406\u306eWindows Server Update Services(WSUS)\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u3057\u3066\u3044\u308b\u306a\u3089\u3001\u3053\u308c\u3089\u306e\u4f8b\u5916\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/div>\n<div>  <\/div>\n<div><b>\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u306e\u8003\u616e\u4e8b\u9805<\/b><\/div>\n<div><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/configuring-firewall-and-proxies-for-smooth-windows-updates\/4517913\" rel=\"noopener noreferrer\" target=\"_blank\"><u>Windows Update<\/u><\/a>\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u30c7\u30d0\u30a4\u30b9\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u53d7\u4fe1\u3092\u505c\u6b62\u3057\u307e\u3059\u3002<\/div>\n<div>  <\/div>\n<div><b>\u8ffd\u52a0\u60c5\u5831<\/b><\/div>\n<ul>\n<li><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/configuring-firewall-and-proxies-for-smooth-windows-updates\/4517913\" rel=\"noopener noreferrer\" target=\"_blank\">Windows\u306e\u30b9\u30e0\u30fc\u30ba\u306a\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u305f\u3081\u306e\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3068\u30d7\u30ed\u30ad\u30b7\u306e\u8a2d\u5b9a<\/a><\/li>\n<li><a href=\"https:\/\/learn.microsoft.com\/windows\/deployment\/update\/windows-update-security\" rel=\"noopener noreferrer\" target=\"_blank\">Windows Update\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/a><\/li>\n<li><a href=\"https:\/\/learn.microsoft.com\/windows-server\/security\/tls\/transport-layer-security-protocol\" rel=\"noopener noreferrer\" target=\"_blank\">\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d7\u30ed\u30c8\u30b3\u30eb<\/a><\/li>\n<li><a href=\"https:\/\/learn.microsoft.com\/windows\/privacy\/manage-windows-11-endpoints\" rel=\"noopener noreferrer\" target=\"_blank\">Windows 11 Enterprise \u306e\u63a5\u7d9a\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8<\/a><\/li>\n<li><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/windows-itpro-blog\/scan-changes-and-certificates-add-security-for-windows-devices-using-wsus-for-up\/2053668\" rel=\"noopener noreferrer\" target=\"_blank\">\u30b9\u30ad\u30e3\u30f3\u5909\u66f4\u3068\u8a3c\u660e\u66f8\u306f\u3001WSUS\u3092\u4f7f\u3063\u3066\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u884c\u3046Windows\u30c7\u30d0\u30a4\u30b9\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u8ffd\u52a0\u3057\u307e\u3059<\/a><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>MC1465017 | Reminder: Configure firewall and proxies for smooth Windows updates Classification stayInformed La [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-18207","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=18207"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18207\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=18207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=18207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=18207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}