Authentication error when trying to connect to home WiFi

My Galaxy 3 won't connect to my home wireless. I've entered the correct SSID and authentication method, I've removed the connection and re-established it, I've rebooted the phone, etc. I do not have this problem accessing WiFi anywhere else. If it matters, the home service is Comcast--and it's the exact same modem & general service as my daughter has, and I have no problems accessing her WiFi.
This question or similar has been asked before, but it looks like no one has been able to answer it so far. I'm hoping that a new discussion might find someone out there who has figured this problem out and fixed it.
Thanks,
Suzanne

I am having the same exact problem. Up until a week ago my Galaxy3 phone automatically connected to my home network whenever I was in my house. All of a sudden, my phone powered off and when it came back up I no longer can connect to my home network. It will work with any other network outside of my house. I tried all the same things that you did including powering off my modem etc. My home computer and tablet are all fine. My husbands Droid X phone still works. Everything can connect to my home modem except my Samsung Galaxy3 phone.
I don't know what happened buy every time the phone tries to connect to my home modem, it gets an authentication error message. When I look at the settings, it looks like the IP address is missing. The phone won't let me "forget" or remove the address. I have tried countless times. I also can't add the IP address manually...there is no way to do this. I would appreciate Anyone helping. It's very frustrating. Did you ever get an answer?
LMK..thanks
roberta

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