Traccar 3.9 do not show location of device

Hi Tana,
Thanks for making such a great app :)
I am new to use Traccar.
I installed Traccar 3.9 on aws ubuntu instance and I also got Traccar client-4 on my Android mobile.
Status shows "Location Update" after few failuares. When I give server address demo.traccar.org, device on selection jumps to its location on map but when I give server address 35.154.11.100, it shows the device but selecting to it do not points to its location on map.
Also log file located at opt/traccar/Logs/tracker-server.log is as bellow:

2017-01-17 16:42:26  INFO: Shutting down server...
2017-01-17 16:44:05  INFO: Operating system name: Linux version: 3.13.0-100-generic architecture: amd64
2017-01-17 16:44:05  INFO: Java runtime name: Java HotSpot(TM) 64-Bit Server VM vendor: Oracle Corporation version: 25.101-b13
2017-01-17 16:44:05  INFO: Memory limit heap: 241mb non-heap: 0mb
2017-01-17 16:44:05  INFO: Character encoding: UTF-8 charset: UTF-8
2017-01-17 16:44:05  INFO: Version: 3.9-SNAPSHOT
2017-01-17 16:44:09  INFO: Starting server...
2017-01-17 16:59:17  INFO: Shutting down server...
2017-01-17 17:00:23  INFO: Operating system name: Linux version: 3.13.0-100-generic architecture: amd64
2017-01-17 17:00:23  INFO: Java runtime name: Java HotSpot(TM) 64-Bit Server VM vendor: Oracle Corporation version: 25.101-b13
2017-01-17 17:00:23  INFO: Memory limit heap: 241mb non-heap: 0mb
2017-01-17 17:00:23  INFO: Character encoding: UTF-8 charset: UTF-8
2017-01-17 17:00:23  INFO: Version: 3.9-SNAPSHOT
2017-01-17 17:00:27  INFO: Starting server...
2017-01-17 17:16:38  INFO: Shutting down server...
2017-01-17 17:26:59  INFO: Operating system name: Linux version: 3.13.0-100-generic architecture: amd64
2017-01-17 17:26:59  INFO: Java runtime name: Java HotSpot(TM) 64-Bit Server VM vendor: Oracle Corporation version: 25.101-b13
2017-01-17 17:26:59  INFO: Memory limit heap: 241mb non-heap: 0mb
2017-01-17 17:26:59  INFO: Character encoding: UTF-8 charset: UTF-8
2017-01-17 17:26:59  INFO: Version: 3.9-SNAPSHOT
2017-01-17 17:27:03  INFO: Starting server...

can you please suggest me where am I going wrong

Please read this page:

https://www.traccar.org/troubleshooting/

Thanks Anton,
From the troubleshooting page I guess last bullet applies to my situation.

If you don’t see HEX message in the log, it means that server doesn’t receive any data from your device. Possible reasons:

1. Server is not visible from the Internet. Use port check tool to verify.

2. Device is configured incorrectly or there is some problem with the device.

I am doubtful about reason 1) mentioned above since location can be found when I use server address demo.traccar.org but fails when I use IP 35.154.11.100.
Also I am doubtful about reason 2) as the same device could able to locate device on 3.7 and earlier release of traccar.

Anton, I was wrong,
the reason 1) resolved my problem.
I added port 5055 in the firewall.
Thanks:)