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Cannot change preferred DNS server from 127.0.0.1 localhost

Posted on 2013-11-14
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Last Modified: 2013-11-21
Hello Experts,

I have an irritating little problem...

The preferred DNS server on my (Windows 7) TCP/IPv4 property page is set to 127.0.0.1 (localhost).

I cannot change this setting to another value. Every time I try it reverts back to 127.0.0.1!

Why is this happening?
Did someone set it up this way to look at the hosts file first?

Does anyone know what is going on here?

Thanks!
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Question by:Saxitalis
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Expert Comment

by:Dontmilkthis
ID: 39649967
The fact that it is automatically changing itself back to 127.0.0.1 despite the fact you're setting it statically sounds like malware activity to me.

have you noticed anything else weird while using the PC?

would be interesting to see if there really is a dns service running on your machine. if you have telnet installed (windows feature) you could try running a telnet to port 53 on your machine... i'd be worried if this works.
telnet 127.0.0.1 53

Open in new window


what's the history of this PC?
have you checked the host file for anomalies? standard hosts file only has 127.0.0.1 as far as I remember.
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Author Comment

by:Saxitalis
ID: 39652021
I think this may have something to do with the OpenDNS service. I was told that this service had been installed on this computer.

According to the documentation... All you have to do to "uninstall" OpenDNS is to change, remove or Obtain DNS Server dynamically on the TCP/IP Properties page...

This is what I have been trying to do but 127.0.0.1 always comes back.

Also, I did scan for Malware and found no viruses.

Could this behavior be caused by the "OpenDNS" service on the computer??

Thanks!
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Accepted Solution

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Dontmilkthis earned 500 total points
ID: 39655018
Hi Saxitalis,

I'm not sure if it's openDNS doing this. From a quick google, i'd suggest it's a product called DNSCrypt which encrypts your DNS requests. In order for this service to work it must set your local preferred dns setting to the local host (127.0.0.1) so that all DNS requests go through it.

is there a chance you have DNSCrypt installed?
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Author Comment

by:Saxitalis
ID: 39655314
Nope DNSCrypt is not installed on this machine but thanks for the idea anyway - hmmm
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Author Closing Comment

by:Saxitalis
ID: 39667362
got me looking in the right place - thanks
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