I am working on a web project where I'd like to use OpenID with Mono on Linux. DotNetOpenAuth has wiki on for configuring OpenID with XSP, but it also listed known issues that have yet to be resolved such as throw an error when using a https certificate.
What has been your experience?
As far as I know, XSP is only a lightweight server for getting started with Mono/ASP.NET; not recommended for use in a production environment.
If you're serious about ASP.NET on Mono in a production environment, I'd set up a proper Apache/mod_mono test environment to run your ASP.NET projects in.
http://wrench.mono-project.com/ is an MVC site I wrote that runs on Mono 2.6.1 using mod_mono and Apache. It uses DotNetOpenAuth. I think all you have to do is use a ~recent version of Mono, and compile the DotNetOpenAuth dll from their "mono2" branch in git.