We need to establish a single signon with an outside web site for which a certif

Craig, do you mean that you need to setup SSL for your site? That's enabled via a web server. For an example see forum.appian.com/.../Configuring_Apache_Web_Server_with_JBoss

On the other hand if you need to use the cert for client authentication or as part of the system truststore it would be a completely different configuration involving the JBoss JVM.

It's not for our site. It's to do a single signon to another website to display some data.

I wasn't sure if perhaps the SSO solution required your site to be using certain SSL cert. Which SSO provider are you working with?

Why the need to deploy a certificate? Is it an Intermediate CA that's not being sent in the chain? Do you have OpenSSL installed on the Appian server, and if so, what's the result of running "openssl s_client -connect" against the SSO URL?

It's a certificate the site author provided and indicated it needed to be sent when prompted. We don't have OpenSSL currently installed.