The Problems with Patching Software
And surely, with ISPs blocking the door, companies would seize the opportunity to update, test and deploy the new patches. Or they could upgrade to Service Pack 3. They could locate and patch all their MSDE clients and, finally, kill Slammer dead.
But 10 days later, when ISPs opened port 1434 again, there was a spike in Slammer infections of SQL Servers. Six months later, in mid-July, the Wormwatch.org listener service showed Slammer remained the most prevalent worm in the wild, twice as common as any other worm. It was still trolling for, and finding, unpatched systems to infect.
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