Error 500 not ok status

Thanks for the reply. But This is not the issue. the devices can establish the server in test connection but can not send the data and the error is produced. Thank you.

Dear OFT, Thank you very much for your support. Here is the address http://182.93.78.22:8380/collect exactly. It works on some devices correctly. Connection is successful when testing and sending data. But in some cases the connection is successful but can not send data and produces that error. I had 20 mobile devices during training. Some of them were no issue. But some devices were able to establish the connection with the server but were not able to submit the data. I also checked whether there might be an error while entering the data. Everything was okay. Now I do not have such devices that can produce such errors. I checked the log file for that day but I could not figure out the error. I am trying to reproduce the same error using another device. Here is the log file link below. The date was 20-22 september 2022.Thank you for your kind attention. https://1drv.ms/u/s!Aje1MQgs51mig5wBrFOSJNkVJWhdqA?e=qd6Y2U