I'm using Hudson 1.104 using the java -jar method.

Steps to reproduce:

1. Go to http://localhost:8080
2. New Job
3. Job name: [foo]
4. Monitor an external job
5. OK

causes the browser to access this URL:

http://localhost:8080/job/%5Bfoo%5D/configure

which serves up a page containing:

Status Code: 404
Exception:
Stacktrace:

(none)

It seems the square brackets are causing problems.