The slave.jar from LTS 1.480.2 version has parameters "-auth" and "-jnlpCredentials". Neither of them seems to work, I will get a "Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64" or "java.io.IOException: Failed to load http://bsjenkinsslave03.server.lan:8280/jenkins/computer/bsjenkinsslave03/slave-agent.jnlp: 403 Forbidden", depending on what combination of parameters I use.
I consider the "manually download the jnlp file" as a very dirty quickhack... will we see a proper launching of the slaves again soon?