Crossdomain cookie in Opera browser

Question

Hi all,

I have few web application based on ASP. NET. Multiple sites authorization is used in there. If I logged on subdomain1.mysite.com, I logged on subdomain2.mysite.com aswell. I used for that the same machineKey configuration.

forms section looks like that:

<forms
name=".ASPXFORMSAUTH"
protection="All"
path="/"
timeout="43200" 
loginUrl="/Login.aspx"
domain=".mysite.com"
/>

It works fine in IE8, FF 3.6, Chrome, but not in Opera. What can be wrong in there? Are there some restrictions for crossdomain cookies in Opera?