On top of sahilsha sahilshas questions, I remember it as you cannot access /dynamic-vpn in the 15.1X49-D70 release. Have you tried connecting with the Pulse Secure client towards your WAN IP and see if you are able to connect?
Potentially also try to move jweb to a seperate url with "set system services web-management management-url jweb". That way Jweb is accessed via https://<WAN-IP>/jweb instead of directly via the IP.