Cookie sharing between sites with the same top level domain

Question

Hi guys, web newbie here,

I'm sharing cookies between two sites of mine, myserver.com and other.myserver.com, by using in Django:

SESSION_COOKIE_DOMAIN = '.myserver.com'

This works in most cases, but when the first site is reached through an iframe like so:

 <iframe src="https://myserver.com/page?data=asdsafaf"&gt;&lt;/iframe&gt;

and redirects it to:

http://other.myserver.com/page2

The second site doesn't recognize the cookie created on the first site.

This happens in browsers: Firefox 3.6.8 on windows, IE 8 on windows and Safari 4.0.5 on Mac OS X

but works fine (the cookie is recognized) in these: Firefox 3.6.8 on Mac OS X and Google chrome 5.0.375.127 on windows

Any ideas?