Cost-effective tool for Single Sign-On server.

[sam]

Dear all,

I m looking for a cost-effective tool(s) for Single Sign-On solution.
Althought I found Kerberos is very  promised, but I can't find a security
auditing tool for Single Sign-On solution. Can anyone please suggest me a
gool tool for security audit for Single Sign-On server?
I would like the Auditing done automatically and periodically on the Sign-On
server.

Thanks
sam