The marketo tracking cookie is crossing over to our other web properties on sub-domains in which we do not have the tracking code installed. For example, we have the marketo tracking installed on www.ezlynx.com. However, our application often uses auto.ezlynx.com and other sub-domains. We do not want the marketo cookie to be tracking user data from these locations, but our IT guys have reported that it is.
Our question is this, is there a way within the tracking code that we can say to marketo “ignore these sub-domains: [list]” and the cookie will not track those locations?
Unfortunately it isn't possible (in any way I can envision) to have the cookie be a first party cookie at the top level which also includes subdomains (by design) and not have it also exist in your other subdomains.