If you are using Avast! Antivirus or Security Suite 2015 or higher, or have recently upgraded to the 2015+ version and OpenDNS is not working, this guide is for you.
A new feature called Secure DNS is bundled with Avast! 2015 and is automatically enabled by default. Secure DNS is a feature that aims to secure DNS on the computer by running it through Avast's known DNS servers. This prevents OpenDNS from working. To allow OpenDNS to work, disable Secure DNS in the Avast! settings under Active Protection (see image below).
Does this affect my computer's security?
Not while using OpenDNS on network. By using OpenDNS, you are already utilizing an alternative Secure DNS product from a DNS security Company. Avast! has bundled in Secure DNS as a no hassle self-setting service to increase security for its users who are not already using a safer DNS product; however, OpenDNS also provides these benefits so disabling Secure DNS will not affect your computer's security and may even increase its security due to OpenDNS' Phishing and basic Malware protection.
When off-network, Avast! does add a layer of security with DNS encryption; however, this is also available on OpenDNS! Avast! Secure DNS includes a DNSCrypt-like service (For more information on DNSCrypt, click here) which sends all DNS to Avast's DNS services. This encryption adds a layer of security when traveling, and to match Secure DNS's level of security, check out DNSCrypt by OpenDNS which is an Open Source tool.
What does it look like disabled?
Removing Avast Secure DNS as a feature to prevent re-enabling
The following steps have not been tested by OpenDNS; however, have been confirmed by the Community to be a solution provided by Avast.
- As a PC administrator go to the Control Panel Settings.
- Choose Programs and Features (or Add/Remove Programs)
- Select Avast but do not yet act or click to uninstall it. Instead right hand click on Avast to get the context menu and select Update (may be called Change).
- After entering the Update screen, you can select Avast features to remove. Remove the DNS filter option. The option screen looks like the image below in the 2015 version.
This is an alternative to disabling the setting in the Control Panel which would make it available for computer users to enable to bypass your OpenDNS filtering and security settings. These steps would prevent the Avast program from bypassing OpenDNS on the computer.