![]() This includes a few folks on Reddit that have been reporting this exact same thing since Monday as well:Īnyone else seeing this? I'm losing my mind here because we just get more and more reports with no end in sight. Microsoft doesn't seem to be acknowledging any issues, and many of us are just plain stuck with royally pissed off users. Uninstalling the June 2023 Windows cumulative update does not affect the issue, and having M365 Apps on Current Channel or Monthly Enterprise Channel makes no difference for the symptoms. ![]() (First thing I suspected since this and other security clients broke Chrome from opening correctly starting last week) The issue is reproducible when our EDR (Cisco Secure endpoint) is removed from a client. We've already employed all manners of usual fix attempts (new profiles, clearing caches, etc) to no avail. * Outlook not syncing messages until 20-30 minutes after the mailbox receives them * Outlook will random lose connectivity and throw a red exclamation mark onto the taskbar icon * Outlook freezing (going "not responding") after 5 minutes of usage For us, the most prevalent symptoms include: Only thing that I can do to receive emails from server is to restart the app. Even clicking send/receive button does nothing. That is logged into my work account, sometimes it does not receive emails, no matter what I do. ![]() Since the beginning of this Monday, we've seen a pretty massive uptick in our environment of complaints about Outlook (another some other pieces of M365 Apps like Word, Excel, Teams) having issues. Sometimes outlook windows app that comes with office 360. I think somewhere there is a bad IPv6 routing issue. Error on the event was "destination unreachable (no route to destination)".ĭisabled IPv6 on the network adapter and their Outlook issues **immediately** went away. For one example, 2603:1036:305:48ca::2 in Texas, which is our Exchange Online front door. Immediately noticed that while Outlook was in the middle of it's "not opening" phase, there were a **ton** of retransmits over IPv6 to Microsoft endpoints. EDIT: Finally got a client where the issue was constantly reproducible enough to get a Wireshark and ProcMon capture. ![]()
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