Once you receive the signed certificate from the CA, you must import it.

To import the certificate, execute the following command, typing it as one continuous string without including any return characters:

keytool -import 
-alias ca 
-file d:\work\ca.cer 
-keypass ca 
-keystore d:\work\fathomstore
-storepass roadrunner

Where:

-import
Causes the certificate to be imported into the keystore file.
-alias
Refers to the new CA certificate.
-file
Refers to the path to and name of the file that contains the CA certificate.