Sharepoint cross web application authentication

Hello!

There are 2web applicationwith different typesof authentication:FORMS(claims)andwindows.

Whether andhow to make thepass-through authentication?

I found asolution, but itdoes not workfor different typesof authentication (((:

1) are assigned the samename Cookie

<authentication mode="Forms">
<forms ... name=".CookieName" ...
/>
</authentication>

2) one and the sameunitboth web.config

<machineKey validationKey="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
decryptionKey="yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy" validation="SHA1"/>