Tutorial :setting cross-subdomain cookies accessible to a sub-subdomain?



Question:

I've set a cookie with domain of .example.com. It is available for every first-level subdomain on my site, as it should be.

It is not, however, available on nth level subdomains, i.e. sub.subdomain.example.com and too.many.subdomains.subdomain.example.com don't see the cross-subdomain cookie while subdomain.example.com does. Is there any fix for this?


Solution:1

The client seems not to follow the rules specified in the rfc. IE fails when there's an underscore in the domain name.

See http://tools.ietf.org/html/rfc6265#section-5.1.3


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