This is the result of the Symantec JAR files not meeting the minimum requirements set by Oracle for the latest version of JRE. You have two options to remedy this: 1) Add the URL for your SMP to the trusted list within your JRE on the machine where you have this problem or 2) Reduce the security setting on the JRE client from high to medium.
Both options can be found under control panel, Java, Security tab. For option 1 (recommended), click the Edit site list, Click Add and type the url of your SMP. For option 2, move the slider to medium (not recommended).