Authentication problem but broadband connects on computer............

Hi

Yesterday my Sony Xperia failed to connect to my broadband for the first time. It found the wifi but wouldn't/couldn't connect. However, my computer that uses the same wifi and password to connect is fine. I have tried re-entering the password etc but it makes no difference - the phone doesn't want to connect and now I receive "authentication problem" messages on it.

Any ideas ??

Thanks

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