“Can’t establish a reliable connection to the server”
Device: Samsung Galaxy Tab
Make sure you date and time are correct. I know it doesn’t seem logical, but check it. I had to manually update the date/time for a tablet I’d let sit around for a few months without using/charging. WiFi was working correctly. However, when I tried to connect to the Google Playstore, I got the error: “Can’t establish a reliable connection to the server” and information telling me to check my WiFi.
Nothing was wrong with the WiFi, which I confirmed by opening up the browser and testing. I noticed the date/time were incorrect. Once I set that correctly, everything worked without me having to do anything else.
This solution may or may not work for you. I would never suggest at this website that you root your device. If the previous suggestion doesn’t work, you may be able to find instructions elsewhere.
NOTE: If you date/time isn’t correct, you also may not be able to Update your android device’s software. So if that, too, is an issue, please just double-check that your date/time is correct before you do anything else.