wifi authentication error - Galaxy S III Q&A, (US Carriers)

My s3 constently refuses to connect to any wifi ap... everytime I get authentication error occured, seems like its a comon issue after I googled it,but no one seems to give a gd fix for it, so any ideas? :S

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WiFi Problems

Hello,
I have bought the i9305 a few days before Christmas. From the beginning on, I was experiencing some problems connecting to WiFi routers. After flashing different custom roms, the problems are still there :
when I'm 2 meters away form the router there is no problem : great speed, stable connection. But when I'm like 10 meters away, I get the error message : "Incorrect Password" -> "Authentication error occurred" and I can't even connect to my WiFi. This happens at all the routers I'm trying to connect to at home and at work. I have already tried different tricks from the internet http://www.gottabemobile.com/2012/07/11/how-to-fix-samsung-galaxy-siii-wi-fi-connection-problems/. Further more I have flashed different modem firmwares. Still the same problem.
Is this a hardware failure and should I try to exchange my S3 LTE?
I had the same problem after doing a Nandroid restore on a replaced i9300. The range went very short and couldn't connect most of the time. I eventually found it was a file called .cid.info in /data that was causing the problem. Try renaming or deleting that file and then turn your WiFi off and back on. Otherwise it's probably a hardware failure.

Starting problem about my wifi router software

Anybody encounter this error when using My WIFI Router software: it keeps saying activating and it doesnt let me deactivate the regular hotspot called "Aphoenix." What is the problem here?

Android Nougat Wifi Authentication Problem

Hello,
So recently I have tried to install several Nougat ROMs (CM14 nightlies and AOSP Extended) on my Oneplus X and they seem to work fine except one issue that is keeping me from switching to those ROMs.
The issue is that I can't seem to be able to connect to my home Wi-Fi (haven't tried connecting to other Wi-Fi routers as I do my ROM installations at home, where only my Wi-Fi is available). Whenever I press the "connect" button, after inputting the password, the connection status under the SSID goes from "connecting" to "authenticating" to "saved" then back to "authenticating" and the "authentication problem". Basically, the authentication fails and I am not able to connect to my Wi-Fi. I have never encountered this kind of problem on CM13 based roms before.
This is the only big issue that keeps me from switching to Nougat ROMs (besides the Wi-Fi authentication problem they seem to be stable enough for daily use) as I constantly use my home wifi.
Has anyone had this kind of issue and solved it?
Any kind of help/input would be very appreciated!
Thanks.
Authentication error is you inputing the wrong password. Sometimes I noticed the keyboard tries to enter a capital for the first letter of your password thinking it's first word of a sentence.
I thought so too, but I made sure to enter the password absolutely correctly (I have probably entered the password over and over again over 20 times...).
Still, no luck...
Found the issue. And now I feel quite retarded...
It seems that my father has changed the Wi-Fi password just a few days ago (right before I came back home for Christmas break) and so I was entering the old password and getting that error.
Basically, the issue is not ROM/Android version related.

"Unable to obtain ip-address" while connecting to WiFi

So i got this classic error. Since im not at home im unable to reset the router (which i think is causing the problem) but im asking either way if someone has encountered the same issue or would have some other solution.
Nevermind, solved the problem through resetting the router.
/Thread

Tab S7+ WiFi issues.

Okay so I thought it was my Wifi but I think it's this tablet.
I can't connect to my phones hotspot or work Wifi. Says "authentication failed" when I'm 100% I know the password even tried QR scanned too.

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