Disable Cookie Forwarding for MashZone NextGen Server Overrides for Sites
When users choose the preconfigured MashZone NextGen Server connection in Web Parts, all aspects of the connection including authentication is defined in the connection. If users override this preconfigured connection, cookie forwarding authentication is enabled by default.
If you are using No SSO + Manual authentication, you should disable cookie forwarding for user overrides of preconfigured MashZone NextGen Server connections. You do this in site settings for a site collection or a specific site.
1. Login is as site administrator for the site collection or specific site.
2. Click Site Actions > Site Settings.
3. Click Mashup Sites for SharePoint Site Settings.
4. Clear the Cookie Forwarding Option Enabled option and click OK.