[outages] Intermittent Connectivity Issues - Office 365

[Jason Posner]

See EX170187 in the service health center.

Title: Unable to receive/send email from/to on-premises environment User impact: Users may be experiencing delays or may be unable to send and receive email. More info: Admins may encounter one or more of the following symptoms: - Admins may see "Connection refused" error in Message Trace or SMTP protocol logs. - Admins may receive a notification stating "Messages from Office 365 using connector 'Outbound On-Premises Connector' have been deferred for more than 1 hour." We've communicated in the Message Center that we were making updates to Exchange Online Protection (EOP) to help your organization configure and update network perimeter devices as well as simplify IP range management. As we have received some reports from users that they're experiencing issues related to these updates, and may have missed the Message Center posts, we're providing additional information. If your organization is experiencing behavior similar to what is described, please review the following information. Current status: To ensure proper mail flow, organizations that are configured for hybrid mail flow or subscribe to Exchange Online Protection (EOP) must make sure that their on-premises network allows connections from all of the current EOP IP address ranges. Please update your on-premises network allow list to accept connections from all of the EOP IP address ranges listed in the following link: https://docs.microsoft.com/en-us/office365/SecurityCompliance/eop/exchange-online-protection-ip-addresses. Scope of impact: This impacts organizations that are configured for hybrid mail flow or subscribe to EOP who have not listed the noted IP addresses.

Jason Posner
Senior Systems Administrator
Weis Markets, Inc
Office: 570-863-2874
Cell: 570-975-9938

From: Outages [mailto:outages-bounces at outages.org] On Behalf Of Robbins, David via Outages
Sent: Monday, December 10, 2018 10:14 AM
To: outages at outages.org
Subject: [outages] Intermittent Connectivity Issues - Office 365

We've verified intermittent connectivity issues between local Outlook clients/mobile devices and Office 365.

Thanks,

Dave Robbins

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