software update/repository issue

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http://forums.fedoraforum.org – I am receiving a message that the software repository is unverified/unreliable. I assumed this was related to a specific update, and deselected all updates and then starting selecting individual updates to identify the cause of the problem. No luck - even when I only had the kernel selected I still received the message. Is there a known cause for this? How do I solve this issue? If memory serves (it doesn't always serve) I believe I have the fastest mirror software installed, is this the issue? (HowTos)