Alfresco Zimlet Cannot Communicate

[ayoub.net]

I try to include zimlet alfresco in order to zimbra and alfresco can comunicate, or save attachment from zimbra to alfresco.

I have install Alfresco 3.4.d and Zimbra 6.12 also Zimbra 7

when i connect with zimlet alfresco this message appear

Failed to Connect to Alfresco !

[ChaSer]

Are you allow to connect from zimbra web clients throu zimbra host to alfresco host ?
Command like:
zmprov mc default zimbraProxyAllowedDomains "*"