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Disruption to Internet access on 8 December 2015

Users of networked resources, particularly those using the Internet and email, may have suffered significant problems on Tuesday 8 December 2015. These problems were the result of a distributed denial of service attack (DDoS) on the UK's national research and education network, Janet, which the University uses to connect to other universities and to the rest of the Internet.

Jisc, who provide the network, posted the following update on facebook:

DDoS attack disrupting Janet network

We have been experiencing a targeted and sustained set of attacks on the Janet network. These are distributed denial of service (DDoS) attacks that have resulted in reduced connectivity and disruption for all Janet customers.

Various blocks and filtering are being put in place to limit the impact of the disruption, but the details of each attack are subject to change.

We have had to reduce our public updates via Twitter and the website as we suspect that this information can be used to inform attacks. We have also received a DDoS attack on and have had to close the website until the attack is over. This has limited our communication channels with customers, but we are working to keep them informed. Customers affected have been contacted and are being provided with up-to-date information via alternative channels.

Our engineering team and security team are continuing to work hard to ensure normal service is resumed as soon as possible, and to reduce the impact of future attacks.

Tim Kidd, executive director, Jisc technologies, said: “We understand the importance of connectivity to colleges, universities and other public sector organisations. We are doing everything in our power to ensure normal service in resumed as soon as possible, and in the meantime to minimise any disruption that users of the Janet network may be experiencing. We apologise for any inconvenience caused.”

A further update has also been posted on the Jisc website.

The effects of the external problems also appear to have caused some difficulties in the way some of our local infrastructure works. UIS engineers are investigating possible solutions to help ensure local services continue to operate in the event of external problems.

Jisc provided further updates on Wednesday 9 and Thursday 10 December 2015.

Last updated: 12:14 10-Dec-2015 by ihc22

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