Virus updates failing

Updates are failing on all 3 of my PC's (running the latest V4.0.417). Are there problems with the update servers? This started happening intermittently over the past several days (i.e. if I manually retried after the failure it worked) but now is happening every time and manual retries don't work. Can anyone help?
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bc

 

Try clearing your update cache in advanced setup.

 

No problems here, also using 4.0.417.
Good luck.

 

What error message do you get when you run a manual update?

 

Bingo. That fixed it. Thanks.

 

Oops, spoke too soon. Only fixed it on one of the 3 PC's.

Marcos there is no specific error message. Just "Virus signature database update failed."
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bc

 

Grumble, well, ok, after another clear-the-cache attempt after the most recent failure, now the second PC is working again.
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bc

P.S. (and ditto the third)

 

Good to know for future reference.

 

Mmm, I suppose, but what would be nice to know is why clearing the cache is necessary. What caused the problem to begin with?
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bc

 

It's not, it's just one of those random things in life that likes to piss you off.