504 ASP License Violation with Sun ONE installation

Dear All

I'm running a test installation on Windows XP using Apache with Sun
One ASP engine.

It's worked brilliantly up to now, but now when I try to access an ASP
page I get this message:

---------------------------------------------------------
HTTP Error 504
504 ASP License Violation

The ASP service reported that there are no unused client licenses
available.

Please contact the server's administrator if this problem persists.
---------------------------------------------------------

I was under the impression the Sun One software was free for unlimited
evaluation purposes, so I've not jumped to the conclusion that a
hidden time-restriction has expired.

Can anyone help with this?

Thanks
Adrian