Is a redirect based on a session cookie hurting rankings?

[jfkorn]

My clients business is divided in chain stores. All stores are set under the same franchise. There is one domain www.company.com with branches like www.company.com/location1/content and www.company.com/location2/content etc. I've taken care of duplicate content issues with rel="canonical" and duplicate page titles are also not a concern, anymore.

Right now the concept is like this: If you visit the site for the first time you get to choose between the locations. Then a cookie is set and once you revisit www.company.com it will redirect you via a php header command to the location stored in your cookie: www.company.com/location1/content.

My question is if this might hurt rankings in some kind of way as these aren't permanent redirects with a 301 but rather individual ones, based on your cookie.

[jfkorn]

Thank you for your answers. As far as I can see, everything is getting crawled, but I also submitted an XML sitemap via webmaster tools. I decided to disable the cookie redirect for a few weeks to see if there are any changes in ranking.

[saibose]

You may want to see how your website cache for your homepage looks like on Google. Maybe its reading the wrong header everytime. My suggestion would be to check that 1st. If it shows fine, I dont think it will hurt your rankings as such. If you have rel=caononical in place correctly, you would be fine. It would be worthy to identify your pages where you want rankings and based on that, you could diagnose.

[StalkerB]

A few things to think about.

If done right I don't think this will effect your rankings much, if at all. You're certainly not the only site that does this and although I've never done something similar with a php header redirect, georouting of visitors based on IP is something I do all the time (and could be something you might want to look into? - http://www.maxmind.com/)

Your concerns here should be how is Google getting around your site? Is your homepage just a location select screen which it then has to crawl individually (a la paradisepoker[dot]com) or is there a default site they'll see and only later find a link to the location versions? If I (or specifically Google) don't accept cookies what can I see?

People linking into your site will be splitting the value a bit, even if you use the canonical tag. What version of the site do you get links to and is that ranking better than the location variations? Would you be better not using the canonical tag but targeting links into each with location qualifiers to keywords?

As I say, if it's done right I don't think you'll be hurting yourself, but would need to look into it a bit more to say for definite.

[AlanMosley]

Are all pages being indexed?
How do the rank relative to each other, is the home pahe ranking well?
playing with redirects is temping fate i think,