Error to connect with PostgreSQL on Amazon Server

I'm having some issues trying to connect with my database, when I try to connect, it displays the error message: "The remote certificate is invalid according to the validation procedure". I tried to connect several times, but this message always appears. Then  I contacted the support of my ERP and they said me that the configuration of the server is correct, and I may have to configure something on my computer but I already followed the steps that I found in some links and nothing works to me.

If someone help me i'll be very grateful.

Thanks