When you wish to acquire a certificate from the JANET Certificate Service, you are required to inform your local authorised representative which software stack your certificate is to run on.
At the time of writing the list of possible answers is as follows:
AOL
Apache/ModSSL
Apache SSL (Ben SSL not stronghold)
C2Net Stronghold
Cisco 3000 Series VPN Connector
Citrix
Cobalt Raq
Covalent Server Software
Ensim
H-Sphere
IBM HTTP Server
IBM Internet Connection Server
iPlanet
Java Web Server (Javasoft/Sun)
Lotus Domino
Lotus Domino Go!
Microsoft IIS 1.x to 4.x
Microsoft IIS 5.x to 6.x
Microsoft IIS 7.x and later
Netscape Enterprise Server
Novell Web Server
Plesk
Quid Pro Quo
R3 SSL Server
Raven SSL
RedHat Linux
SAP Web Application Server
Tomcat
Website Professional
WebStar 4.x and later
WebTen (from Tenon)
WHM/cPanel
Zeus Web Server
OTHER