My situation (sorry for doubleposting):
vBulletin is located at forums.domain.com
Photopost is located at class.domain.com
Your plug-in module is used to connect and utilize vB database, however, users cannot login from Photopost when they try to do it, an error message apperas:
POST requests from foreign hosts are not allowed
cookie is set to .domain.com
Please advice, how to allow users enering the system from another subdomain?