keytool error: java.lang.Exception: Input not an X.509 certificate

Cause

This error occurs for three reasons:

Incorrect Alias used

Incorrect Keystore used

Incorrect Certificate used

Resolution

To resolve this issue

Check :

1. The original alias of the original keystore that was used to generate the csr must be used
2. The original keystore used to generate the CSR must be used.
3. The correct certificate must be downloaded.