This article will go into detail on how to generate certificate signing request on Cisco ASA 5500 VPN.
CN - The name through which the firewall will be accessed (usually the fully-qualified domain name, e.g., vpn.domain.com).
OU - The name of your department within the organization (frequently this entry will be listed as "IT," "Web Security," or is simply left blank).
O - The legally registered name of your organization/company.
C - If you do not know your country's two digit code, find it on our list.
ST - The state in which your organization is located.
L - The city in which your organization is located.
Please note: None of the above fields should exceed a 64 character limit. Exceeding that limit could cause problems later on while trying to install your certificate.
Remember the filename that you choose and the location to which you save it. You will need to open this file as a text file and copy the entire body of it (including the Begin and End Certificate Request tags) into the online order process when prompted.