Patrick, i do not know what that Jetty problem is yet.

Would you please try this:

Create a new directory anywhere, and then cd to it, i.e.
] mkdir test
] cd test
] forrest seed-sample
] forrest run

Then with your web browser go to:
 localhost:8888

That will run the test sample site to ensure that
all is well with your Forrest setup.

-David