Clients Status Offline on Server (Raspberry,Apple,Samsung)

Hello,

I'm working on Traccar on Raspberry Pi.
I've configured my traccar server as explained in this topic : https://www.traccar.org/forums/topic/installing-traccar-server-on-raspberry-pi-rasperian/

The server started, everything was working.

I downloaded the Traccar Client in my Iphone 6 (And also in Samsung Models), and I put the correct parameters (url,...).
But when I refresh my page localhost:8082, it's still telling me that there isn't any client connected.

But yesterday, i saw that it worked for a short time, i saw "online" and it gave me position.

How can I fix this? How long should it take for the client to be online on server?

Thank you

Here is my log :

2019-05-17 14:24:13  INFO: Operating system name: Linux version: 4.14.98-v7+ architecture: arm
2019-05-17 14:24:13  INFO: Java runtime name: OpenJDK Client VM vendor: Oracle Corporation version: 25.212-b01
2019-05-17 14:24:13  INFO: Memory limit heap: 224mb non-heap: 0mb
2019-05-17 14:24:13  INFO: Character encoding: UTF-8 charset: UTF-8
2019-05-17 14:24:13  INFO: Version: 3.11-SNAPSHOT
2019-05-17 14:24:28  INFO: Starting server...
2019-05-17 15:23:34  INFO: Shutting down server...
2019-05-17 15:25:06  INFO: Operating system name: Linux version: 4.14.98-v7+ architecture: arm
2019-05-17 15:25:06  INFO: Java runtime name: OpenJDK Client VM vendor: Oracle Corporation version: 25.212-b01
2019-05-17 15:25:06  INFO: Memory limit heap: 224mb non-heap: 0mb
2019-05-17 15:25:06  INFO: Character encoding: UTF-8 charset: UTF-8
2019-05-17 15:25:06  INFO: Version: 3.11-SNAPSHOT
2019-05-17 15:25:18  INFO: Starting server...
2019-05-17 15:36:26  INFO: Shutting down server...
2019-05-17 15:36:33  INFO: Operating system name: Linux version: 4.14.98-v7+ architecture: arm
2019-05-17 15:36:33  INFO: Java runtime name: OpenJDK Client VM vendor: Oracle Corporation version: 25.212-b01
2019-05-17 15:36:33  INFO: Memory limit heap: 224mb non-heap: 0mb
2019-05-17 15:36:33  INFO: Character encoding: UTF-8 charset: UTF-8
2019-05-17 15:36:33  INFO: Version: 3.11-SNAPSHOT
2019-05-17 15:36:46  INFO: Starting server...

I really don't know how to read this, if you could help me

Here is my traccar.xml file :

<entry key="config.default">./conf/default.xml</entry>

    <entry key='database.driver'>org.h2.Driver</entry>
    <entry key='database.url'>jdbc:h2:./data/database</entry>
    <entry key='database.user'>sa</entry>
    <entry key='database.password'></entry>
    <entry key='web.port'>8082</entry>

Hi,

Maybe you could share the other log file, especially the one of the day when the devices appeared on the interface.
What the Status log in the application tell you ?

Hello,

I reset all the system at this time, so i don't have it, but I'll retest this and I will tell you if it's good or still not