Dear all, Thank you very much for your time to read this message. Thank you All, I have qustion about certificate that we build in openser in order the openser support TLS. They are CA root certificate and client/server certificate. Here is my question: 1. What is certificate file that we have got after running ./gen_rootca.sh belogs to? I mean, what is cacert.pem, 01.pem, cakey.pem belongs to? Is it belongs to server? and for what does it use? 2. What is certificate file that we have got after runnign ./gen_usercert.sh belongs to? I mean, what is user-cert.pem,user-privkey.pem, user-calist.pem belongs to? Is it belongs to server or client? and what does it use? 3. What is TLS belongs to? It belongs to TCP protocol or UDP protocol? I do hope anybody can help me and give me an answer. Please.. Thank you. Regards, Ferianto --------------------------------- Do you Yahoo!? Get on board. You're invited to try the new Yahoo! Mail.