Plugin exited before we could connect

[s4mur4i]

Hy,

I am trying to install the plugin on one of our systems, but I am missing something.
When running the build:

./bin/packer build --only=edge-xenserver -debug -on-error=ask /tmp/packer.json
Failed to initialize build 'edge-xenserver': error initializing builder 'xenserver-iso': plugin exited before we could connect
Debug mode enabled. Builds will not be parallelized.
edge-xenserver output will be in this color.


==> Builds finished but no artifacts were created.

I cannot get any further information or error on what the issue is :(
After building from source I see the files there:

bash-4.3# ls -l bin/
total 88808
-rwxr-xr-x    1 root     root       3175268 Aug  2 12:15 gox
-rwxr-xr-x    1 root     root      54773371 Aug  2 12:16 packer
-rwxr-xr-x    1 root     root      16530287 Aug  2 12:16 packer-builder-xenserver-iso
-rwxr-xr-x    1 root     root      16453197 Aug  2 12:16 packer-builder-xenserver-xva
bash-4.3# ./bin/packer-builder-xenserver-iso
panic: Please do not execute plugins directly. Packer will execute these for you.
goroutine 1 [running]:
main.main()
	/go/src/github.com/xenserver/packer-builder-xenserver/plugin/builder-xenserver-iso/main.go:11 +0x9e

The config is very basic:

{
      "name": "xenserver",
      "type": "xenserver-iso",
      "iso_url": "/tmp/cd.iso",
      "iso_checksum": "769474248a3897f4865817446f9a4a53",
      "iso_checksum_type": "md5",
      "ssh_username": "{{user `user_name`}}",
      "ssh_password": "{{user `user_password`}}",
      "ssh_timeout": "15m",
      "remote_host": "xen.example.com",
      "remote_username": "root",
      "remote_password": "root",
      "vm_name": "xen-latest",
      "output_directory": "output",
      "format": "vdi",
      "vm_memory": "2049",
      "floppy_files": [
        "preseed-xen.cfg"
      ],
      "disk_size": 8000,
      "boot_wait": "15s",
      "boot_command": [
        "<enter><wait>",
        "<f6><esc>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs><bs><bs><bs><bs><bs><bs><bs>",
        "<bs><bs><bs>",
        "/install/vmlinuz ",
        "auto=true priority=critical ",
        "preseed/file=/floppy/preseed-virtualbox.cfg ",
        "net.ifnames=0 biosdevname=0 ",
        "netcfg/get_hostname=xen ",
        "netcfg/get_domain=xen ",
        "initrd=/install/initrd.gz -- <enter>"
      ]
    },

Some values are bogus, just showing what values are. I tried with adding bogus remote_host, or invalid user/pass, but error does not change. When logging into xenserver the values are correct.

Thank you for any help