[one-users] Add Ec2 Host to OpenNebula 4.8 for Cloudbursting

[info at cyle.ch]

Dear Community

i try to add an ec2 host for Cloudbursting to my OpenNebula 4.8 Private Cloud.

i have configured

IM_MAD = [
     name       = "ec2",
     executable = "one_im_sh",
     arguments  = "-c -t 1 -r 0 ec2" ]

VM_MAD = [
     name       = "ec2",
     executable = "one_vmm_sh",
     arguments  = "-t 15 -r 0 ec2",
     type       = "xml" ]

in the /etc/one/oned.conf

AND:

regions:
     default:
         region_name: eu-west-1
         access_key_id: My_ACCESS_KEY
         secret_access_key: MY_SECRET_ACCESS_KEY
         capacity:
             m1.small: 5
             m1.large: 0
             m1.xlarge: 0

in /etc/one/ec2_driver.conf

but, if i create the ec2 host with:
onehost create ec2 --im ec2 --vm ec2 --net dummy
i always receive an error message

ec2 err | ERROR 	Wed Oct 22 21:52:54 2014 : Error monitoring Host  
eu-west-1 (26): Error executing poll


Thanks for assistance
Best regards
Cyrill