Agent does't connect to server

Dear all,

I've configured the server for accept only agents that uses ssl certificate and specific credentials.

SSL is working fine but the system doesn't accept the credentials, providing a "very useful" error

"Can't call method "do" on an undefined value at /usr/local/share/perl/5.24.1/Apache/Ocsinventory/Server/System.pm line 189"

While on client side I have "Cannot establish communication : 500 Internal Server Error" (apache is up and running).

Any idea?

Thank you for you support.

Kind regards,

Gabriele