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!

Understanding IPv6 Third Edition

Joseph Davies’ latest book Understanding IPv6: Your Essential Guide to IPv6 on Windows Networks is now available. Now in its third edition, this book is an excellent reference for systems administrators and network engineers wanting to learn the fundamentals of IPv6, and specifically how IPv6 is deployed on Microsoft networks. The book explains in detail the inner workings of the IPv6 protocol, including addressing, IPv6 headers, ICMPv6, and neighbor discover. In addition the book also covers IPv6 name resolution, routing, and transition technologies such as ISATAP, 6to4, Teredo, IP-HTTPS, DNS64, and NAT64. New in this addition is a chapter covering DirectAccess in Windows Server 2008 R2 and Windows Server 2012. Get your copy today!

%d bloggers like this: