USB debugging permission alerts stopped although USB Debugging is enabled on android 4.4.2 I was able to connect my android mobile to my computer as I enabled USB debugging from the developer options. I used to receive the USB debugging permission alert and from there I switch from charging to file transfer.

All of a sudden and while my device is having a low space problem, the USB debugging permission alert stopped appear when I connect it to my PC. That means I can not connect him to my PC as I can not give the permission as the default is charging. I tried two different PCs (Ubuntu based, and Windows 10 based) with no luck as well as two different cables. I used another android phone with the same cable and to the same PC and it connects OK.

My mobile has an Android version of 4.4.2 and updates stopped a while ago. 
My other mobile (Android 7.0) is connecting with no problem. I connected several times before from this mobile with no issue. 

I tried to restart the mobile and switch off and on the USB debugging option with no luck. I am trying to connect it to my computer to take some backup and free some space.

Here is the information of my mobile:


Huawei Honor 4C CHM-U1 
Memory at the current time: 391 MB Free 8 GB total
Android version of 4.4.2


Can any body help me how to fix this?
It was a hardware problem. When I pushed the cable hard into the port, it connected. I will need to fix the port. Thanks for the support.