Just came across a cookie issue on subdomains. Everything works great in Firefox, but sometimes doesn't work in IE.
I set the cookie on example.com (or subdomain.example.com) and the cookie can be read on some subdomains, but not others. I finally detected a pattern:
- example.com works
- www.example.com works
- sub-domain.example.com works
- sub_domain.example.com does NOT work
Other than banning IE (heh) or redirecting sub_domain.example.com to sub-domain.example.com (ick- thousands links and indexed pages to the underscored subdomains), any possible fix?