Why am I getting an "Authentication" Failure & how do I fix it please?

[Android Central Question]

Hello I need some expert advice here please....I've been trying to fix this for days. I'm running Android 7 with modem "Fritz!Box 6490 Cable". When I try wireless I keep getting "Authentication" failure so obviously no internet .
So on a guide at https://forums.androidcentral.com/ambassador-guides-tips-how-tos/326698-guide-troubleshooting-wi-fi-connection-problems.html
....."3. See if the router’s security is interfering. ......."
having tried everything else I momentarily switched off all security on the modem and everything worked...connected! When I then tried all the separate protocols...back to same problem. On a Windows 10 rig, internet no problem. Now that I know its a security problem, what's my next step? I'm going nuts here, any help much appreciated

 

[B. Diddy]

Welcome to Android Central! What kind of security protocol is the router set up with? WEP? WPA? WPA2? Is it AES or TKIP?

Please register on this forum, which will allow you to engage in discussion more easily, as well as post images. https://forums.androidcentral.com/ask-question/409154-join-android-central-community.html

 

[T Clarke]

Now registered. Thank you for the fast reply. Set up to WPA2(CCMP). Also on the dropdown WPA(TKIP) and WPA +WPA2

 

[B. Diddy]

Try changing it to AES (on WPA2) on both the router and the phone.

 

[T Clarke]

Sorry, I don't know how to do that, and there's no AES on the dropdown

 

[B. Diddy]

Are you on WPA2-PSK?

EDIT: Oh, never mind -- after looking through that router's manual, it looks like CCMP is the same as AES: https://gzhls.at/blob/ldb/a/0/d/a/bd5303b7dbca8391ad079bca1d915a6c8cbb.pdf

What if you change from WPA2 to WPA (which uses TKIP)?

 

[T Clarke]

I've tried all other protocols...from my first post...."When I then tried all the separate protocols...back to same problem.".all bring "authentication" problem. I only get internet access when I completely switch out security

 

[B. Diddy]

Any firmware updates available for that router? https://en.avm.de/service/fritzbox/...ge-base/publication/show/2_Updating-FRITZ-OS/

As an aside, it's probably not a good idea to brand a tech item "Fritz."

"Hey, where's the remote?"

"Uh-oh, it's on the Fritz."

 

[T Clarke]

Update

 

[B. Diddy]

Hmm. Can you clarify what Android device you have? What if you boot your Android device into Safe Mode?

 

[T Clarke]

Android 7 and safe mode makes no difference

 

[B. Diddy]

Android 7 is the version. What device do you have (i.e., manufacturer and model name/number)?

 

[T Clarke]

It's a Wiko/ Lenny 4 Plus

 

[B. Diddy]

Try wiping the cache partition, if you haven't already done so: https://www.hardreset.info/devices/wiko/wiko-lenny-4/recovery-mode/

 

[T Clarke]

Wiping Cache didn't bring any change. Just to recap, may be something relevant....
Telephone Mobile "Wki Lenny 4 Plus" and a tablet "XIDO X110/3G" both show authentication problem.
TV Box MXQPro, "Wiki Lenny 4" and both Win10 desktops have no problem (although recently one WIN10 Installation has been dropping the internet connection...s. Attach....although this may be a provider problem). Again, with all security dropped on the Router...everything connects....so it's a router problem, or.....? And thank you for your patience.

 

[B. Diddy]

You're using this FRITZ!Box as both a modem and router, right? You don't have a separate router connected to the modem?

In that FRITZ settings menu you shared above, can you show the rest of the security options?

 

[T Clarke]

That has to be done tomorrow but no seperate router

 

[T Clarke]

o.k., I had somebody check the phone out on another router, it connected to the internet without a problem

 

[B. Diddy]

Sometimes certain routers have firmware-related issues with allowing some devices to connect. If you exhaust the possibilities for a fix, you may just have to buy a separate router and connect it to the FRITZ!Box (and turn off the router feature of the latter).

 

[T Clarke]

Do you think a "reset to factory defaults" would achieve anything?