I have a website which uses my own backend API service for login (JSON Api over HTTPS Connection). I realized few days ago that on some mobile devices the login is not working because the backend API service cannot be reached. This only happens on Chrome/Opera but Firefox works fine. The problem also only appear when the device is on a mobile network. When connected to wi-fi everything works fine again.
The concerned devices seems to all have vodafone network. So, it might be connected to that. The website is for office usage so it is 100% legal and should not be blacklisted.
What I tried without any success:
- I cleared all Browser Data of Chrome
- I entered the ip of the backend service directly in the browser to rule out any dns resolve issues
- Lite-Modus of chrome is disabled
I would be grateful about any ideas/advices.
I will also contact Vodafone support to see if they can help.