"BT restored its ADSL network to normal operation this afternoon after attempts to guard against a serious security problem overnight inadvertently disrupted the connections of a substantial minority of UK Net users this morning.
In response to a serious DoS risk affecting a wide range of Cisco routers and switches (which emerged yesterday), BT sensibly decided to upgrade the software on its core network routers to non-vulnerable versions of Cisco's IOS software. Unfortunately not everything went smoothly."
The Register - BT overdoses on Cisco security fix
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