In total, there are approximately 20,000 people who have had the opportunity to book an appointment for vaccination in Västerbotten County.
But not many people succeeded in doing so on Tuesday morning.
Several who tried to book an appointment have only received error messages.
The region has posted information about the problems on 1177.
Those who work at the vaccine clinic at Nolia in Umeå could not use the computers in the morning either.
The Västerbotten region has had problems with the telephone exchange since the weekend - and the problems can possibly be linked to this.
- We do not really know what happened but we had to move to plan B, ie paper and pencil, says Sinnela Keskiniva, head of department.
What was to be a smooth vaccination in a quarter of an hour suddenly took much longer.
The queue, which was several hundred meters long, did not move at all.
At 11 o'clock the computers now run as usual for Region Västerbotten and the vaccination is in full swing.
Hear about the problems in the video above.