Traffic from adnxs.com

[tlainevool]

I have been seeing traffic in my analytics from adnxs.com. This appears to be some kind of ad server run by AppNexus. I'm not sure why I'm seeing traffic from here because I don't do any advertising through AppNexus.

When I google for adnxs there appears to be some kind of browser redirect virus associated with it

The traffic that comes from there is pretty bad quality, with almost no engagement. (low pages/visit, conversion etc.)

Any idea what this traffic is and if I should be worried about it?

[Bewenched]

Well, Google could view the bounces from that type of traffic as your site being of low quality.

[tlainevool]

Well, Google could view the bounces from that type of traffic as your site being of low quality.

Google (according to official policy anyway) shouldn't be able to track bounce rates from non-google sources.

[Bewenched]

Shouldn't and don't are two different things. It's been reported by some advocacy groups that Google Chrome does indeed send packets of data even though they publicly claim that it does not.

4.2 Google is constantly innovating in order to provide the best possible experience for its users. You acknowledge and agree that the form and nature of the Services which Google provides may change from time to time without prior notice to you.

[google.com...]

so they could legally switch on tracking and switch it off... their wording in the document is vague and wide open.