Hey, I'm getting a "This Connection is Untrusted"
Yes monneda, You're right, that's because the certificate is an auto-sign one, not purchased in any of the official sites like VeriSign to reduce costs.
For that reason, browsers alert you that the certificate is not generated by a CA(certificate Authority). But this way, the server encrypt data.
If you feel more comfortable, U can access the site without https layer, just type
http://ptc.sytes.net/trueque/articulo.php?id=32 , but in this case, no encryption will be carried out, and Ur data will travel just plain.