Mule ESB: Could not register server: sun.security.validator.ValidatorException

This error can also be found in Mule’s own documentation. But I am just writing this up for myself, because I ran into the error several times already.

Could not register server: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

1. Delete or rename the truststore.jks file. Located in your Mule installation folder, e.g. C:Program FilesMule.mule.agent
2. Restart the Mule service
3. Go into MMC and retry to register the server