Small companies are fighting off an average of 500 attacks each month from viruses, worms and denial of service attempts.

Research commissioned by application switching provider Radware found that 70 per cent of the 50 small businesses it monitored experienced more than 1,500 attacks over a two-week period in August - largely because of the outbreak of the SoBig virus.

And with web-based distributed applications becoming more pervasive, the majority of security threats facing corporations will be at the application level across port 80, the research warned.

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