MessageHTTPUploader.performUpload: [SSLHandshakeException]

we are getting below error when connecting to our known partner

PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target[ValidatorException/PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target]
This is a mainly a negotiation problem on the protocol level. Your partner rejected your connection.
Either your partner expected a secure connection (HTTPS) and you tried a raw connection (HTTP) or vice versa.
It is also possible that your partner expects an other SSL/TLS protocol version or cipher than you offer.

Forum
AS2

Comments

The root certificate is missing in the mendelson AS2 config. Please identify the root CA and add it to the TLS/SSL certificate list.