Dear all, Thank you very much for this chance. Thank you for your time to read this message. All, I have read document about tls from openser.org In that document, I read that to create CA root and client certifacate, we just must run script ./gen_rootCA.sh and ./gen_usercert.sh where is in tls/tools. It will produce rootCA directory and user directory. Then, I put the rootCA directory and user directory into my public webserver in order the client can download it. But, when I try to download the certificate from the server (using Redhat 9.0), to the client computer (using Windows XP), why I can not download it? Do, I have to convert the extension form .pem to .crt? How can I convert it? Please help..Please.. Regards, Ferianto __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com