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krb5kdc + Wrong OS Time + Losing Wifi Password on start up ...

hi i just turned on my mac book pro running the latest snow leopard version and suddenly a pop up about krb5kdc and mDNSResponder showed up asking me for approval and then i noticed that my home wifi showed up but the saved password was gone and also my email accounts were no longer logged in on iMail. Also the OS Clock resets everytime i restart now

what's going on i didnt even install anything when i turned it off last night ...

Mac Book Pro, Mac OS X (10.6.3), iPhone 3G - 16 GB white

Posted on Apr 13, 2010 8:11 AM

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37 replies

Apr 29, 2010 7:47 AM in response to othlover

Same problem here too. "krb5kdc" & "mDNSresponder" want firewall privileges, the clock is at January 1st, 2008, and the wifi password is gone. My computer was sent off to apple, and it came back... with the same problem. From reading many different threads I'm wondering if this is 100% fixable at the software & user accessible hardware level.

Apr 29, 2010 7:55 AM in response to thehappysymptom

What's actually happening is because the time is wrong, the keychain entries for krb5kdc, mDNSResponder and your AirPort network's password aren't accessible (since the time is too "early" for their keychain entries to be valid.)

The clock on your MBP is kept by the PRAM which I should be backed by your battery or a battery-backed chip on your main board.

If you see this issue repeatedly and have AppleCare and/or are still under warranty, you should check with your local Apple servicer, as this battery should not go dead that quickly.

Apr 29, 2010 6:31 PM in response to othlover

Okay.
I rebooted and everything's back to normal.

So it looks like for some reason the date and time occasionally reset on boot.
William Kucharski told us that:
…because the time is wrong, the keychain entries for krb5kdc, mDNSResponder and your AirPort network's password aren't accessible (since the time is too "early" for their keychain entries to be valid.) …

So these keychains must hold the keys to a lot of the security configuration (firewall, AirPort passwords, FileVault data, etc.) . Since these keychains are inaccessible, those configurations can't be unlocked and are therefore inaccessible. So Snow Leopard resets them. And that's why it asks you stuff about the firewall and says “Access to this item is restricted.” whenever you try to get data from Keychain Access. I imagine that it would probably prevent FileVault users from logging in.

May 27, 2010 2:55 PM in response to Dogcow-Moof

Hey again,

I wanted to give you all an update: The machine was sent off to apple (by the reseller I got it from) where they supposedly replaced the power supply and logic board. Two weeks went by with no problems, then when switching to the high performance gfx card last night, I logged back in to be greeted with the same problem!

New information- I had reset the clock to do a time machine backup before taking it in. Once at the store- the problem couldn't be repeated - until I clicked "automatically set date and time", then viola, all the errors returned.

I'm going to try my best to get an exchange, assuming it is in fact hardware. Good luck.

krb5kdc + Wrong OS Time + Losing Wifi Password on start up ...

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