I saw ping is OK, but it is not possible to ping firewall by default. How did you turn off the firewall?
Also I don't know anything about your network, maybe it's huge, with many hosts, and 192.168.1.1/2 is popular, maybe you pinged something else.
1) You can try to ping the your machine FROM the SG to make sure there is network availability.
2) You can check the states of interfaces (show interfaces all OR show interface eth0/mgmt/etc.). Maybe interface is down.
3) You can change ip-address to a less used one.
Also you didn't write what does "it's not working" mean. Error? Endless website loading? Just light-grey screen? 🙂