Outlook Offline over DirectAccess on Windows 10

Outlook Offline over DirectAccess on Windows 10You may encounter a scenario in which Outlook on Windows 10 reports that it is working offline while connected remotely via DirectAccess. The Network Connectivity Status Indicator (NCSI) shows DirectAccess is in a connected state and all other internal resources are accessible.

Outlook Offline over DirectAccess on Windows 10

This is caused by the default settings of the IP-HTTPS tunnel interface on the DirectAccess server not advertising a default route for connected DirectAccess clients. To resolve this issue, enable default route advertising for IP-HTTPS on each DirectAccess server in the enterprise by running the following PowerShell command.

Get-NetIPInterface | Where-Object {$_.InterfaceAlias -eq “IPHTTPSInterface”} | Set-NetIPInterface -AdvertiseDefaultRoute Enabled -PassThru

Outlook Offline over DirectAccess on Windows 10

In the past I’ve heard reports of this setting being overwritten after group policy refresh. Recent testing on Windows Server 2016 does not show this behavior, however. Please report any results you may have in the comments below. Thanks!

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  1. ioan

     /  November 28, 2017

    Hi Richard.
    The settings are overwritten only in one specific deployment scenario. This is happening on DA servers with only one network adapter.

  2. Bernhard

     /  January 15, 2018

    Hi Richard! We found out, that the settings are overwritten by a task called RaConfigTask (Microsoft\Windows\RemoteAccess). We wrote a powershell script, that is triggered by event-id 10018. This script contains only the following line: netsh int ipv6 set int xx advertisedefaultroute=enabled (xx is the index of the IPHTTPSInterface).

    • Yes, the RaConfigTask task essentially forces a reapplication of GPOs, which obviously overwrites the changes we make to the server directly. Glad you were able to come up with a workaround though!

  3. Windows 7 clients seem exempted of this issue.

  4. Anyway this enables also the connection of Skype for Business clients, together with Outlook. Thanks for sharing.

  5. Chris

     /  February 17, 2018

    Hi Richard
    we’ve the problem that MS Outlook will prompt the user for their credentials each time if the network connection was(shortly) lost(for example suspend mode, inactive user,…). I can click “save the credentials” but it will not work. So i closed the client and start it again. Any idea?
    Thanks Chris

    • That’s unusual and I’ve never encountered that scenario myself. To me it sounds like a Kerberos ticket is expiring, but I have no idea why momentarily losing network connectivity would cause that. Perhaps it is an authentication setting specific to Outlook that forces reauthentication?


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