If you are using Symantec/Verisign certificates and seeing the “Incomplete FCPath” error around last quarter of 2015 then it is the result incorrect certificate chain. This type of error occurs with KeyStores. The following is the recommended fix to over come the problem.
1. Obtain the intermediate “Symantec Class 3 Secure Server CA – G4” certificate from Symantec and import it to the trust KeyStore.
2. Also obtain the root “Versign Class 3 Public Primary Certification – G5” certificate from Symantec and import it to the trust KeyStore.
Make sure that the KeyStore is in correct path.
The above solution will fix the error.
Similar problem also exists for windows based servers and the solution is little different.