As far as I can make out, "Received a invalid response" [sic] is a recurring intermittent problem on Vodafone's mobile broadband system. I used to get a whole lot of it 2-3 years ago, but fortunately for me I've rarely seen it in the past year. It seems to affect some sites more than others. I've never seen any actual admission it's a Voda fault, even less a fix for it. I suspect it's a caching issue and/or an incompatibility between Voda's web-proxies/cache and certain websites.
Try using https:// instead of http:// if the site supports it (secure http bypasses Voda's meddling proxies), but beyond that I'm not sure what the solution is.
Well actually, my overall workaround for such niggles is to have a cheap Orange mobile broadband dongle (£5/500MB/month) as a backup for the random sites which Vodafone fails with from time to time... it's a pain, but it's the pragmatic solution if you don't have wired broadband.
To be more positive, overall Vodafone's broadband been much more reliable overall for me in the past year or so than in the time before that. Plus, having upgraded my firmware and now my dongle, ping times have dropped to ~125ms (compare to 250ms with the old E220 modem and original firmware), downloads peak at 6Mbps at quiet times (2~3Mbps not usual in the later evening) and uploads go to 1Mbps. Yay!
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