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Given the error, suspect a MD2 cert is being used.
As of 1.6.0_17 (6u17) they are no longer supported as they are no longer considered secure.
The 6u17 release notes:
6861062 java classes_security Disable MD2 in certificate chain validation
 Also see this bug, for which the error message was added:
It is recommended to request or renew a new certificate with stronger cryptographic algorithm from the Certificate Authority (CA).