http-proxy 212.168.65.36 8080
http-proxy-option AGENT Mozilla/5.0
search this string "http-proxy-option" this link
http://openvpn.net/index.php/open-source/documentation/manuals/65-openvpn-20x-manpage.html
second line not work. please try. openvpn not add user-agent string. why?