SSL - System.Security.Cryptography.CryptographicException: Store CA doesn't exists / Store Root does

Hi,

when I try to call an SSL web service from **Android **i got those exceptions:

System.Security.Cryptography.CryptographicException: Store Root doesn't exists.
System.Security.Cryptography.CryptographicException: Store CA doesn't exists.
Java.Security.Cert.CertificateException: Loading...
Java.Security.Cert.CertificateException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

this works fine in Windows Phone and iPhone,

I find two similar threads about it but without an official Xamarin response or resolution, how can I solve it?

http://forums.xamarin.com/search?Search=System.Security.Cryptography.CryptographicException:+Store+CA+doesn't+exists

http://forums.xamarin.com/discussion/2866/system-security-cryptography-cryptographicexception-store-root-doesn-t-exists