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It happened again, one second ago it worked so fine, and then any webpage showed the same.
Where I should check,
The iceweasle sometimes showed me
problem loading page,
the connection timeout,
and after 10 mins or so it works again.
is it possible some virus.
it's happened once yesterday and also today.
During this period, I can ssh out to other service, and also ssh to this computer.
But I failed to use synaptic to download other browse to test.
Thanks for any suggestion.