After Up2Date from 9.165 to 9.171 with Endpoint Protection enabled, it's now not possible to deactivate it.
The following error occured:
[FONT="Fixedsys"]Unexpected error in epp_disable_asg: malformed JSON string, neither array, object, number, string or Atom, at character offset 0 (before "Node/epp.pm line 370[/FONT]
After I reset the registration token, it's possible to active/deactivate Endpoint Protection.