Reset WLAN network configuration - What .plist file?

I would like to reset my wireless network configurations, delete all network related preferences and settings and start over. This helped me before to solve a problem that I was unable to connect to a  network at work.
The 802.11x settings won't load the certificate from the domain that will enable me to connect to my corporate WLAN network.
Can somebody tell me which files these were, so that I can delete them and start again.
Any ideas why this keeps happening and what files these are?
Thanks for any replies and all help.

In Keychain Access, search for the certificate. I don't know how you can check if it is loading. You might just try deleting it and reinstalling.
There are functions in the Keychain Access>Certificate Assistant>Evaluate
See here: http://docs.info.apple.com/article.html?path=Mac/10.5/en/9088.html
And here: http://support.apple.com/kb/HT3326

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    The iphone is updated to the latest ios too
    WHAT SHOULD I DO!!!!!!!!!!!???????

    This might help
    http://support.apple.com/kb/ht3406

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