callback url problems

[ste...@leafspa.com]

Using Miva 5.5 and trying to get Google Checkout working, but the
callback URL feature just doesn't take. I'm always getting the
following error: Anyone have similar problems and know what to do?
(the Miva tech guys have been looking at this for a week without any
luck). Thanks

We encountered an error trying to access your server at
https://www.leafspa.com/Merchant5/graphics/00000001/google/google.mvc?Store_Code=LeafSpa
-- the error we got is javax.net.ssl.SSLHandshakeException:
sun.security.validator.ValidatorException: PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException: unable to
find valid certification path to requested target

[Victor]

Check your SSL certificate; it doesn't seem to be issued from a trusted
Security Authority. That might be your problem.