Thank you for this very quick answer
When is the new feature fails, is there any log entry is SCP logs?
> Where is it? I send a file by mail, if it is good?
Does this feature work if the firewall is disabled?
> yes he told me he was able to delete the comment if the plugin is disabled
He thinks it would be a problem with the joomla controller (not sure if he understood, maybe ask him the question)!