On Windows 2008 R2 Java Applet throws "Publisher cannot be vertified" error

I have a signed Java Applet which works just fine other than Windows 2008 R2 64-bit machine. On Windows 2008 R2 64-bit machine I am getting "Publisher cannot be vertified" error.

I have another applet which is just working fine in the same environment.

Error dialog contains details:

Warning security

The publisher cannot be verified by a 开发者_C百科trusted source. Code will be treated as unsigned.

Name: $FileApplet

Java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: OCSP response error: MALIFORMED_REQUEST

Thanks in advance, Rahul