A faulty antivirus update issued by Kaspersky Lab on Monday left many of its home and business customers unable to access any websites on their computers.
Systems administrators using Kaspersky Endpoint Security (KES) on their corporate networks started reporting the problem
on Kaspersky's support forum on Monday afternoon, Eastern Time. The reports kept piling up until late in the evening.
"I have ~12,000 machines running KES8 and my help desk started getting calls about an hour ago saying users were having problems accessing various web sites," one user named bradb21 reported.