Configuration: Hudson is configured for internal user authentication,
matrix-based security.

As per bug 1555, if anonymous does not have overall read permission in addition
to job/build, then remote trigger does not work, with or without token.

If token is configured on a job, and anonymous is granted overall/read and
job/build rights (bug 1555 - read access required to trigger remote build), the
job can be built without a token - job/JOBNAME/build will build (no need for
?token=xyz).

Hudson version 1.184