Security firm Kaspersky Lab has issued an apology after thousands of corporate computers running Microsoft's Windows XP operating system were cut off from the internet by an antivirus software update.
“Kaspersky Lab would like to apologise for any inconvenience caused by this database update error. Actions have been taken to prevent such incidents from occurring in the future,” the firm said in a statement.
Some users also reported that they were unable to access their internal company networks after installing the software update, while others were critical of the security firm’s quality assurance.
Dorset-based IT consultant Graham Lord tweeted: "Bravo on breaking the internet on all your XP clients."
The security firm told affected users to disable its antivirus software or roll back the update before issuing a fix within two hours.
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However, users had to perform several tasks, such as disabling their web antivirus, before the fix could be applied because their computers were unable to access the internet, according to the BBC.
Most of those affected were business users running Windows XP, but consumers were also affected by the faulty update, according to US reports.
Although the faulty update only affected web access, this meant that many of the affected businesses were unable to carry out core activities for more than two hours.
The problem affected Kaspersky Anti-Virus for Windows Workstations 6.04 MP4, Kaspersky Endpoint Security 8 for Windows, Kaspersky Endpoint Security 10 for Windows, Kaspersky Internet Security 2012 and 2013, and Kaspersky Pure 2.0.