This article addresses the case where a JWeb and JSC (Juniper Secure Connect) both the accessible, even though, only the JSC (Juniper Secure Connect) is Configured and there is no JWeb configuration.
root@jtac-srx# show system services | display set set system services web-management https pki-local-certificate juniperone
JWeb is only accessible using the url - "https://<interface IP>/admin" when "set system services web-management management-url admin" CLI is configured.