unable to configure crossdomain security

Hi, I am trying to invoke a service bean deployed at doman D1 from domain D2.

Below are the configuration made to the 2 domains.

At Domain D1

1) Checked "Cross Domain Security Enabled" under Domain -> Security

2) Assigned "CrossDomainConnectors" group to the user proxy_user (my app uses this username )

3) From the "Credential Mapping" tab of Security Realms -> myrealm, created new credential mapping by specifying

 a) the url of domain D2

 b) the user name used to connect from D2 (proxy_user)

 c) the password.

 d) selected the cross-domain protocol.

At Domain D2

1) Checked "Cross Domain Security Enabled" under Domain -> Security