Hi All,
For anyone trying to create a new cert with keytool following the instructions at https://www.xeams.com/new-cert-with-keytool.htm
Note that the latest keytool implementation (JDK 9) defaults keystores to pkcs12 and you need to change to a java using the additional option of {-storetype storetype} when first creating the keystore i.e.
-storetype jks
If you have already created the keystore and need to convert use
keytool -importkeystore -srckeystore synametrics.pks -srcstoretype pkcs12 -destkeystore synametrics.cert -deststoretype jks -deststorepass [PASSWORD]
If you don't there will be a failure to start Xeams after the reboot.
I hope this helps others that are having similar issues to me.