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Sounds like the browser may have the credentials saved or the mac may. You can erase them from the keychain in mac and each browser has different settings. Which browser are you using?
ok yes. In that case the credentials (if stored) are likely in your keychain. Under the spotlight search, type in "keychain". Open the "keychain" item and look for the outdated credentials. You should be able to delete them from there. Let me know if you need more specifics or if this does not work.
Launch Safari, open Safari’s preferences, and click the Passwords tab
Here you should find the cached credentials. I apologize for the delay in response...
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