Can you help me, please ????
please note that for technical problems (especially when you need a quick analysis and resolution) you should always file a service request with technical support. The community is used mainly for discussion, not for troubleshooting specific issues.
Are you trying to get Yahoo messenger through the HTTP or IM proxy part of the Web Gateway? If you are using the HTTP Proxy (e.g. Yahoo messenger will speak HTTP to us) it is most likely that the SSL inspection breaks the connection. If you allow a certificate this usually means that MWG will not check it but still tries to open the SSL tunnel, which breaks some applications which verify the tunnel.
You could try to find which server the messenger is trying to connect to (you should have CONNECT requests showing up in the access.log) and add these request to the "SSL Host Tunnel List".
thanks for your support, i will request with technical support.
(Do you know contact with technical of Mcafee ????, so I from Viet Nam)