I-trac MT-01 Device not working on my own server

So i have I-trac MT-1 device which is working fine on demo.traccar.org

I was using SMS command "8040000 40.112.128.183 5013" to connect my device on Traccar server

Recently I setup my own app at http://198.74.51.193:8082 but the same Chinese device is not responding my server.

I tried using SMS command "8040000 198.74.51.193:8082 5013" as well "8040000 http:198.74.51.193:8082 5013" but nothing. please help guys.

7100000
8030000 "your_apn"
8040000 198.74.51.193 5013

Remember to open port 5013 in firewall on your server.
Then wait for gps-fix and try http://198.74.51.193:8082