jenkinci/mesos-plugin can't automatically connect jenkins slave to jenkins master

Question

I have followed the installation guide and I still encounter issues getting jenkins slaves to connect to the master.

My mesos slaves are all having a jenkins user. with UID 1000

JAVA_HOME is into mesos slave path as well.

Version:

• mesos: 1.2.0-2.0.6
• marathon: 1.4.3-1.0.649.ubuntu1604
• jenkinsci/mesos-plugin: 0.14.1

Cloud configuration:

In marathon I have the jenkins master instance running in bridge mode :

I have consul and HAproxy proxying jenkins-2.service.consul.50000

I also have consul and HAproxy proxying jenkins master http://jenkins-2.service.consul

Expected result

Jenkins master should be able to run jenkins slave in mesos by it's own.

Result

In Mesos, I have a LOT of framework running, is it normal ?

When I run a new task:

The slave have difficulties to start

It is offline :

If I login on a valid mesos slave, and as jenkins user, I start the jnlp agent manually:

It does work :

I also enabled FINE Loglevel on my jenkins master :

https://pastebin.com/93C2qsYR

I noticed this :

INFO: Accepted connection #18 from /172.16.0.2:48806
May 09, 2017 3:47:29 AM hudson.TcpSlaveAgentListener$ConnectionHandler run
WARNING: Connection #18 failed
java.io.EOFException
    at java.io.DataInputStream.readFully(DataInputStream.java:197)
    at java.io.DataInputStream.readFully(DataInputStream.java:169)
    at hudson.TcpSlaveAgentListener$ConnectionHandler.run(TcpSlaveAgentListener.java:213)

INFO: Accepted connection #19 from /172.16.0.2:49443
May 09, 2017 3:47:44 AM hudson.TcpSlaveAgentListener$ConnectionHandler run
WARNING: Connection #19 failed
java.io.EOFException
    at java.io.DataInputStream.readFully(DataInputStream.java:197)
    at java.io.DataInputStream.readFully(DataInputStream.java:169)
    at hudson.TcpSlaveAgentListener$ConnectionHandler.run(TcpSlaveAgentListener.java:213)

May 09, 2017 3:47:59 AM hudson.TcpSlaveAgentListener$ConnectionHandler run
INFO: Accepted connection #20 from /172.16.0.2:50088
May 09, 2017 3:47:59 AM hudson.TcpSlaveAgentListener$ConnectionHandler run
WARNING: Connection #20 failed
java.io.EOFException
    at java.io.DataInputStream.readFully(DataInputStream.java:197)
    at java.io.DataInputStream.readFully(DataInputStream.java:169)
    at hudson.TcpSlaveAgentListener$ConnectionHandler.run(TcpSlaveAgentListener.java:213)

I rather not launch my jenkins slaves manually. Is there a way to get more logs or plugin flow explanation.

• Why does it refuse to connect to the jenkins master at the beginning?
• I have read about LIBPROCESS_IP, but since the command work fine, could this be related to my issue ? I think it is not.
• Why is the slave trying to connect on a different port than 50000 ?

Any help is much appreciated