Same issue here...

GE will claim
Quote:


Google Earth detected an error while trying to authenticate Please check the following:
yadaydada nonsense See answer 20717

error code 30





I then used packetyzer to get to the real problem, and it turns out that google returns a HTTP Error 304 Forbidden when trying to log in, and some more drivel on why it happens, though you never see that in GE.

The full text of the error is:
Quote:


We're sorry...
but we can't process your request right now. A computer virus or
spyware application is sending us automated requests, and it
appears that your computer or network has been infected.

We'll restore your access as quickly as possible, so try again soon.
In the meantime, you might want to run a
a href="http://www.download.com/Antivirus/3150-2239-0.html">
virus checker
or href="http://www.download.com/sort/3150-8022-0-1-4.html"spyware
remover to make sure that your computer is free of viruses and other
spurious software.
We apologize for the inconvenience, and hope we'll see you again
on Google.





Well, gee, what does that mean? Anything more specific? "There's something bad happening on the Internet, so we currently don't like you" would be my interpretation. I have a virus-scanner thank you, no adware due to Firefox and Spybot S&D. But of course I cannot vouch for any of the 5000+ other users that are using the same internet access. So something bad is happening on the internet, okay. The sky is blue, right?

Let's hope this nonsense is over soon.

Cheers,
-dan