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Original KB number: 3154531
Symptoms
When users try to access their Exchange Online mailbox in Microsoft Outlook or Outlook on the web (formerly known as Outlook Web App), event ID 1014 is logged multiple times in the System log in Event Viewer:
Cause
This issue may occur if the request was blocked by third-party malware or an Internet protection suite. The time to live (TTL) on the outlook.office365.com DNS record is five minutes. Therefore, Windows refreshes the record at an interval of five minutes. Third-party malware and Internet protection suites have been found to block the request at this frequency, which prevents users from using Outlook or Outlook on the web to connect to their Exchange Online mailbox.
Resolution
Work with your third-party vendor to set up exclusions for the outlook.office365.com DNS record.
More information
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