Windows 7: "Lightroom has experienced an unexpected Sign In failure. Please try again later."

Lightroom sync with the iPad app had been working wonderfully for me. Suddenly, in the Windows desktop app, I'm signed out, and trying to sign in results in, "Lightroom has experienced an unexpected Sign In failure. Please try again later." To my knowledge nothing changed on my PC to trigger this issue, and I had been using the sync multiple times daily when the error suddenly cropped up. Creative Cloud remains cheerfully signed in.
Other Mac-related threads mention a similar error that includes something to the effect of "(attempt to index a nil value)," but that parenthesized message does NOT appear in this case, and needless to say the Mac solution that has been posted for this problem (http://helpx.adobe.com/lightroom/kb/error-unexpected-sign-failure-occurs.html) doesn't apply to a PC.
Any suggestions/solutions would be appreciated. Thanks!
Update 4/29/14: After having changed nothing, I am able to sign in to Lightroom again (although the sign in does not persist when I close Lightroom). I had a case pending with Adobe support, that had been escalated; perhaps over the past day they did something behind the scenes to solve my primary sign-in issue, but if so, they didn't communicate it to me.
Message was edited by: DoNotWantAScreenName

I got the same error in Windows 7. Here's what I found - jump ahead if you find the technical terms confusing.
For me, it turned out to be a network configuration problem related to IPv6, as Ary Gunawan has said. In simple terms, Windows claims that it has a working IPv6 setup, and therefore Lightroom tries to connect to an IPv6 address instead of an old-school IPv4 one, and that fails.
I haven't been able to establish with certainty if it is a local problem in my network config, or related to my ISP, or if Adobe screwed up. What I do know is that Lightroom returns an extremely unhelpful error message, doesn't provide an error log of any sort, and fails to switch to IPv4 when there is an problem.
Disabling IPv6 support in Windows worked for me, but may cause unwanted side effects because Windows relies on it (says Microsoft). It's better to make Windows prefer IPv4, but leave IPv6 in place.
So I fixed it with a tool called "Prefer IPv4 over IPv6" (Microsoft Fix it 50410), available at http://support.microsoft.com/kb/2533454 . After running it and rebooting, LR did work.
If you try the fix but need to go back to the Windows default configuration for whatever reason, just run the tool "Prefer IPv6 over IPv4" from the same page.
More configuration tools, including one to completely turn off IPv6, are available at http://support.microsoft.com/kb/929852 .
Good luck!

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