Getting the dreaded NET::ERR_CERT_AUTHORITY_INVALID message - Galaxy Tab S2 Q&A, Help & Troubleshooting

Hi all,
Hi all, first time poster here, please highlight any indiscretions or mistakes in etiquette and I will address them going forward (forgiveness is appreciated!). I have also asked this question on the Android Central forum a couple of days back but have had no response yet.
I have a Galaxy Tab S2 - 8.0 inch screen size, 3GB RAM, 32GB Storage, Android 7.0 (Kernel Version 3.10.9-10949424). It's been absolutely fine for over a year, the only recent thing I can recall doing which may have some relevance is removal of the Airwatch Software and Agent which my previous employer used to manage devices connecting to their corporate network. No AV software is installed.
I first noticed the issue when trying to browse one of the regular newspaper sites I read in Chrome, I got the "Your connection is not private message", with the "NET::ERR_CERT_AUTHORITY_INVALID". I am not able to proceed to the site - I just get the "back to safety" option.
The problem is more wide reaching, some apps that require internet access do not work any more, Google Play thinks it is not connected to the internet. Some web sites do work however, and so do some apps. A standard Google search will not work. E-mail via the stock app and the Outlook app both work.
I searched through many websites and found the same advice and steps to attempt resolution in a number of places, I will highlight below what I have tried.
Resetting the time, from automatic to manual and back on a number of occasions, with reboots in between.
Have tried connecting to 3 different WiFi networks, all of which work fine with other Android devices and my Win 10 laptop.
Rebooted my home router.
I have cleared the Chrome cache / history multiple times.
I tried the stock browser, the same happens.
Disabled Chrome, rebooted.
Re-enabled Chrome back to it's default version.
Installed the Toaster app via an apk, but I have to admit I have no idea what to do with it.
Rebooted multiple times.
There are no user installed certificates to delete / remove.
Under Settings->General Management->Reset, I went for Reset Settings and Reset network settings, with reboots etc...
None of the above have worked, the only thing I haven't done is a factory reset, to avoid the pain of restoring everything, even with backups etc it's tedious.
Any other suggestions or advice on anything I missed would be most welcome please before I take that step, many thanks in advance.
Peter

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not yet
(The message you have entered is too short. Please lengthen your message to at least 10 characters.)
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[Q] Problem with wifi after lollipop update on Sprint HK M8

Hello,
My wife and I are both having similar issues with wifi after updating our phones to lillipop. We can connect to the wifi, but apps that require a login or apps that have an optional login are giving errors saying that there is no network (Network issues, no connection, etc.)
Apps that don't work with wifi: Bank apps, Amazon apps, Twitch, Feedly, Speedtest.net, etc.
Apps that do work on wifi: Chrome, YouTube, Drive, Mail apps, etc.
If we turn off the wifi, everything works fine. We both are running stock phones, I've got the HK M8, and she's got an older M7. There are times when a few of the apps will work for a few minutes, but then the issues come back. My wife's phone is also able to connect to our work wifi, when there, some of the apps that don't work at home will consistently work, but not all of them
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I've tried everything I can think of. I've also factory reset our router and tried every wifi channel and/or security option, hoping that it is an issue with my wifi router.
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Sounds exactly like the problem I had. Factory reseting the router took care of it for me though...
You can read my thread HERE
Gracon said:
Hello,
My wife and I are both having similar issues with wifi after updating our phones to lillipop. We can connect to the wifi, but apps that require a login or apps that have an optional login are giving errors saying that there is no network (Network issues, no connection, etc.)
Apps that don't work with wifi: Bank apps, Amazon apps, Twitch, Feedly, Speedtest.net, etc.
Apps that do work on wifi: Chrome, YouTube, Drive, Mail apps, etc.
If we turn off the wifi, everything works fine. We both are running stock phones, I've got the HK M8, and she's got an older M7. There are times when a few of the apps will work for a few minutes, but then the issues come back. My wife's phone is also able to connect to our work wifi, when there, some of the apps that don't work at home will consistently work, but not all of them
We've both been told by HTC to do factory resets and to flash the latest stock RUU. The issue remains even after doing this. I don't really want to do the next step of sending in our phones for 7 to 10 days while they "repair" them.
I've tried everything I can think of. I've also factory reset our router and tried every wifi channel and/or security option, hoping that it is an issue with my wifi router.
Does anyone have any idea of what I can try before having to mail HTC my phone?
Thanks for any help.
Click to expand...
Click to collapse
Hey there, i have been using an M8 for two months now and the problem that I have, which fits exactly the description of yours, is starting to annoying me. Every time I try to use these apps which need login I have to turn to mobile data to be able to do it. In my case, the issue that us affecting me the most, is with whatsapp, which even though I do can use, I cannot download media on wifi! (Neither pictures nor voice recordings).
It's a real pain in the neck to be doing this all the time, and I have two friends who also have m8s and are suffering from the same problems, so I guess it's something quite generic. Besides all the other android phones in my family work just fine with my router, so the problem is clearly mine. I think that HTC should have done something about it long time ago if it is such a common issue, considering that the price of the device is not cheap...
Anyway, my question is: have you been able to solve the problem? If you have, would you please take a min to share the solution? I would be deeply grateful!
Cheers and thanks in advance
I am using my HTC One M8 HK with lollipop update from the time they released and never had any problem with wifi. I use wifi wherever I go and no problem with anything. Try the following solutions:
1. Check the WiFi Router. Most of the times it is the problem with your router. Check if there is any restrictions or whitelist/blacklist of services.
2. You might be having some apps with whitelist/backlist running in the background. It could be your antivirus app, battery booster or Opera app, etc which does the wifi whitelist.
3. If you are using the sign-in wifi networks, make sure you signed in to the network using the browser window before opening the app.
4. If you are using the VPN (even in the wifi network) you won't be able to open the apps like Bank apps.
5. If the apps you installed are not supported in your country, you won't be able to access.
Try uninstalling and reinstalling the apps. Sometimes, when you upgrade to different OS partitions are not aligned properly. Reinstall and check.
Good luck

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