{"id":12641,"date":"2025-08-30T09:01:10","date_gmt":"2025-08-30T00:01:10","guid":{"rendered":"https:\/\/m365jp.net\/?p=12641"},"modified":"2025-08-30T09:03:55","modified_gmt":"2025-08-30T00:03:55","slug":"servicerestored-ex1144490-exchange-online-users-may-be-unable-to-access-sender-office-com","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2025-08-30-servicerestored-ex1144490-exchange-online-users-may-be-unable-to-access-sender-office-com","title":{"rendered":"[serviceRestored] EX1144490 | Exchange Online | Users may be unable to access sender.office.com"},"content":{"rendered":"
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EX1144490 | Exchange Online | Users may be unable to access sender.office.com<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may have been unable to access sender.office.com.<\/td>\n<\/tr>\n
Last Updated<\/th>\n08\/29\/2025 23:30:26<\/td>\n<\/tr>\n
Start Time<\/th>\n08\/27\/2025 23:59:00<\/td>\n<\/tr>\n
End Time<\/th>\n08\/29\/2025 22:50:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to access sender.office.com<\/p>\n

User impact: Users may have been unable to access sender.office.com.<\/p>\n

More info: As a result of being unable to access sender.office.com, users may have been unable to delist IP addresses from our anti-spam lists.<\/p>\n

Final status: We performed additional troubleshooting and we were able to successfully reconfigure the impacting authentication component. Once the reconfiguration completed, we restarted system services and monitored the environment to validate that the impact was remediated.<\/p>\n

Scope of impact: Any user attempting to access sender.office.com may have been impacted.<\/p>\n

Start time: Wednesday, August 27, 2025, at 11:59 PM UTC<\/p>\n

End time: Friday, August 29, 2025, at 10:50 PM UTC<\/p>\n

Root cause: An authentication component within a portion of service infrastructure was misconfigured and causing the impact.<\/p>\n

Next steps:
– We’re reviewing our monitoring and detection tools to find methods of identifying similar authentication component issues prior to them causing impact in the future.<\/p>\n

This is the final update for the event.<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb: \u30e6\u30fc\u30b6\u30fc\u304c\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059 sender.office.com<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff: \u30e6\u30fc\u30b6\u30fc\u304c sender.office.com \u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u304b\u3063\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30: sender.office.com \u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u304b\u3063\u305f\u305f\u3081\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u30b9\u30d1\u30e0\u5bfe\u7b56\u30ea\u30b9\u30c8\u304b\u3089 IP \u30a2\u30c9\u30ec\u30b9\u3092\u524a\u9664\u3067\u304d\u306a\u304b\u3063\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u6700\u7d42\u30b9\u30c6\u30fc\u30bf\u30b9: \u8ffd\u52a0\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u5b9f\u884c\u3057\u3001\u5f71\u97ff\u3092\u53d7\u3051\u308b\u8a8d\u8a3c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u6b63\u5e38\u306b\u518d\u69cb\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u518d\u69cb\u6210\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001\u30b7\u30b9\u30c6\u30e0 \u30b5\u30fc\u30d3\u30b9\u3092\u518d\u8d77\u52d5\u3057\u3001\u74b0\u5883\u3092\u76e3\u8996\u3057\u3066\u3001\u5f71\u97ff\u304c\u4fee\u5fa9\u3055\u308c\u305f\u3053\u3068\u3092\u691c\u8a3c\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u5f71\u97ff\u306e\u7bc4\u56f2: sender.office.com \u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u5f71\u97ff\u3092\u53d7\u3051\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u523b: 2025 \u5e74 8 \u6708 27 \u65e5\u6c34\u66dc\u65e5\u5348\u5f8c 11 \u6642 59 \u5206 UTC<\/p>\n

\u7d42\u4e86\u6642\u523b: 2025 \u5e74 8 \u6708 29 \u65e5\u91d1\u66dc\u65e5\u5348\u5f8c 10 \u6642 50 \u5206 UTC<\/p>\n

\u6839\u672c\u539f\u56e0: \u30b5\u30fc\u30d3\u30b9 \u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u306e\u4e00\u90e8\u5185\u306e\u8a8d\u8a3c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u6b63\u3057\u304f\u69cb\u6210\u3055\u308c\u305a\u3001\u5f71\u97ff\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u76e3\u8996\u304a\u3088\u3073\u691c\u51fa\u30c4\u30fc\u30eb\u3092\u898b\u76f4\u3057\u3066\u3001\u5c06\u6765\u5f71\u97ff\u3092\u53ca\u307c\u3059\u524d\u306b\u3001\u540c\u69d8\u306e\u8a8d\u8a3c\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u554f\u984c\u3092\u7279\u5b9a\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3064\u3051\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u30a4\u30d9\u30f3\u30c8\u306e\u6700\u7d42\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1144490 | Exchange Online | Users may be unable to access sender.office.com Status serviceRestored Classific […]<\/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-12641","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/12641","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=12641"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/12641\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=12641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=12641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=12641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}