Outlook displays a Disconnected status when IPv6 is enabled

  • Article
  • Applies to:
    Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, Outlook for Microsoft 365

Original KB number:   3134780

Symptoms

Microsoft Outlook cannot connect to your Microsoft Exchange mailbox, and the connection status is displayed as Disconnected.

Cause

This issue may occur if you have IPv6 enabled on your network adapter and there are network connectivity issues on your IPv6 network.

Resolution

To resolve this issue, fix the connectivity issues related to your IPv6 network.

Workaround

If you are unable to resolve the issues on your IPv6 network, you can work around this issue by using one of the following methods.

Method 1: Disable IPv6 on your network adapter

  1. Select Start, and then select Control Panel.
  2. Select Network and Sharing Center.
  3. In the View your active networks area, select Local Area Connection, and then select Properties.
  4. On the Networking tab, clear the Internet Protocol Version 6 (TCP/IPv6) check box, and then select OK.

Method 2: Download the fix that's associated with the Prefer IPv4 over IPv6 in prefix policies part in Guidance for configuring IPv6 in Windows for advanced users.