Students were plunged into internet darkness today as the University of Sheffield's wireless network went down.
The blackout began at around midday, according to the university, but it said the connection was restored at most locations across campus by 2pm.
The university said it was still investigating the cause but exams had not been affected and it expected the entire campus to be reconnected by the end of the day.
Professor Wyn Morgan, vice-president for education at the University of Sheffield, said: "Connection to the internet was briefly disrupted at the University of Sheffield today, the cause of which is currently being investigated. The majority of the university buildings now have internet connection again and the university expects that the entire campus will be reconnected by the end of the day.
"Scheduled exams have all taken place today without any problems reported. The university has kept in touch with students via social media to keep them updated about the situation. Our thanks to all staff and students for their cooperation during this unusual break in service."
Students at the University of Sheffield reported that Eduroam, the wireless network serving UK universities, had stopped working at around 11am.
Some people expressed their anger at the disruption, which happened in the middle of the exam period.
But others took it in their stride, with one student joking: "eduroam not working and so PhD students resorting to reading actual books and making notes".
The Tab student website also saw the funny side, writing that 'resilient' students had survived without their favourite 'procrastination outlets' like Netflix and Instagram.
Sheffield Hallam University said its students had not been affected as it operates its own WiFi network.
It is not known whether universities elsewhere in the UK were hit by the outage. The Star has attempted to contact Eduroam but has not received a response.