In staging, if you click on a user link (for example, on a permissions page, or the 'modified by' column in a document library), it automatically goes to our staging MySites site. With fiddler, I see that the user link is actually pointing to the /_layouts/userdisp.aspx page, which is redirecting to MySites.
In production, clicking on a user link stays in the same web app, bringing up the /_layouts/userdisp.aspx page (i.e. it does not redirect.)
Is there a setting somewhere that controls whether to perform these redirects?