I had similar issues. First, make sure that VPN tunnel is turned off. Then make sure Remote Access (HTTP and HTTPS) is enabled for AceManager.
Originally, my SIM card APN settings did not allow me to have a static IP. Thus, my SIM card ended up with some weird local IPs that are probably routed by the Mobile network. When I got the proper APN settings allowing me to have a Static WAN IP, then the AceManager was accessible through the Static WAN IP.