Stuck setting up - Githubissues

I managed to install and (hopefully) configure the plugin: I'm now able to see the Swarm Dashboard and all my nodes are listed, but there is where I'm now stuck at.

What I tried is to use the label defined in the template (docker-slave) as the value for the Pipeline Model Definition > Docker Label, but this puts all my builds on-hold pending for a agt-shared_master_6-2 slave which never gets started:

Started by user admin
 > git rev-parse --is-inside-work-tree # timeout=10
Setting origin to http://vcs.example.com/Docker/shared.git
 > git config remote.origin.url http://vcs.example.com/Docker/shared.git # timeout=10
Fetching origin...
Fetching upstream changes from origin
 > git --version # timeout=10
 > git config --get remote.origin.url # timeout=10
using GIT_ASKPASS to set credentials Git username/password for http://vcs.example.com/Applications/eliza.git
Setting http proxy: 10.235.34.235:3129
 > git fetch --tags --force --progress -- origin +refs/heads/*:refs/remotes/origin/*
Seen branch in repository origin/master
Seen 1 remote branch
Obtained Jenkinsfile from 43d370e49e0cdc972972f6603a92d076a0c235fb
Running in Durability level: MAX_SURVIVABILITY
[Pipeline] Start of Pipeline
[Pipeline] node
Still waiting to schedule task
‘agt-hared_master_10-6’ is offline

On the Jenkins logs I can't find any valuable information:

2019-09-16T11:36:55.819080338Z Sep 16, 2019 11:36:55 AM org.jenkinsci.plugins.docker.swarm.docker.api.request.ApiRequest handleFailure
2019-09-16T11:36:55.819149887Z WARNING: API Request response status 500. Message: Internal Server Error
2019-09-16T11:38:37.735158878Z Sep 16, 2019 11:38:37 AM hudson.model.AsyncPeriodicWork$1 run
2019-09-16T11:38:37.735225191Z INFO: Started DockerContainerWatchdog Asynchronous Periodic Work
2019-09-16T11:38:37.736831167Z Sep 16, 2019 11:38:37 AM com.nirima.jenkins.plugins.docker.DockerContainerWatchdog execute
2019-09-16T11:38:37.736849963Z INFO: Docker Container Watchdog has been triggered
2019-09-16T11:38:37.741127249Z Sep 16, 2019 11:38:37 AM com.nirima.jenkins.plugins.docker.DockerContainerWatchdog$Statistics writeStatisticsToLog
2019-09-16T11:38:37.741170485Z INFO: Watchdog Statistics: Number of overall executions: 0, Executions with processing timeout: 0, Containers removed gracefully: 0, Containers removed with force: 0, Containers removal failed: 0, Nodes removed successfully: 0, Nodes removal failed: 0, Container removal average duration (gracefully): 0 ms, Container removal average duration (force): 0 ms, Average overall runtime of watchdog: 0 ms, Average runtime of container retrieval: 0 ms
2019-09-16T11:38:37.742026929Z Sep 16, 2019 11:38:37 AM com.nirima.jenkins.plugins.docker.DockerContainerWatchdog loadNodeMap
2019-09-16T11:38:37.742058801Z INFO: We currently have 5 nodes assigned to this Jenkins instance, which we will check
2019-09-16T11:38:37.742968419Z Sep 16, 2019 11:38:37 AM com.nirima.jenkins.plugins.docker.DockerContainerWatchdog execute
2019-09-16T11:38:37.742990195Z INFO: Docker Container Watchdog check has been completed

Same applies for the Jenkins web interface which hangs indefinitely:

[11:36:55 AM] Creating Service with Name : agt-hared_master_10-6

I've double checked the TCP connection is open and responding:

Client: Docker Engine - Community
 Version:           19.03.2
 API version:       1.40
 Go version:        go1.12.8
 Git commit:        6a30dfc
 Built:             Thu Aug 29 05:28:55 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.2
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.12.8
  Git commit:       6a30dfc
  Built:            Thu Aug 29 05:27:34 2019
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.6
  GitCommit:        894b81a4b802e4eb2a91d1ce216b8817763c29fb
 runc:
  Version:          1.0.0-rc8
  GitCommit:        425e105d5a03fabd737a126ad93d62a9eeede87f
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

Now, either there's something I haven't understood or I'm using this plugin in the wrong way: in both cases, I'm seeking for help...

jenkinsci / docker-swarm-plugin

Stuck setting up #48