Alaa here. Recently, Simplex-IT techs received calls about slow Internet connections and slow Outlook mail flow. After some troubleshooting and different attempts to resolve this issue, we stumbled upon Internet Protocol version 6 (IPv6) and as part of the troubleshooting process, we decided to disable this item. Interestingly enough, by disabling IPv6 everything just worked, Internet connections were faster and mail flow was normal again.

So, what is IPv6? It’s a way to allow a lot more devices to be on the internet.  Learn more by going here.

Now, we’re not saying IPv6 is broken.  But a lot of ISP’s (the folks who give us internet access) haven’t completely implemented their support for IPv6.  And we think that’s what is behind the issue.

In order to disable IPv6, go to Start menu and open Control Panel. In Control Panel, select Network and Sharing Center. On the left hand side select Change adapter settings. Then right-click on the Local Area Connection adapter (This might also be named Ethernet) and select Properties. Finally, uncheck the Internet Protocol Version 6 (TCP/IPv6) item and click OK.

However, we would like to point out that this is not a fix for everything, we have only had a couple of incidents where that was the solution, so we recommend trying this as a last resort for any connection issues with Microsoft Outlook or slow Internet connections.

Even though most Internet Service Providers are not yet ready to deploy IPv6 to residential customers, if you would like to find out whether your ISP supports IPv6 and if your computer systems are IPv6 ready, I have just the right tool for you.  Check out