log on lync client error

hello all , 

I installed lync server and configured it , i have access to https://<yourca.fqdn>/CertSrv and all is fine. i did a copy past of the certificate of lync to windows 7(my client)

when I tried to open lync client I have this error: "we are having trouble connecting to the server lync"

I khnow that I have to insert this certificate to the trusted group but how? I tried something but concedring the error message , i conclued that something wrong.

in teh DNS manager , i configured admin,meet and dialin and _srvinternaltls

any help??

Best regards