Hello there! We are trying to upgrade our Swarm stack, but noticing that swarm-client-3.4.jar can't connect: 

SEVERE: Could not obtain CSRF crumb. Response code: 404
Failing to obtain http://example:8080/computer/nodename/slave-agent.jnlp
java.io.IOException: Failed to load http://example:8080/computer/nodename/slave-agent.jnlp: 403 Forbidden

However, if I just run swarm-client-2.0-jar-with-dependencies.jar with the same arguments, it connects. So it clearly isn't a master security/auth issue, it's just an issue with the 3.4 swarm client. This is blocking us from upgrading so would be awesome to figure out what's up!