Services hosted on the internal University of Otago network are normally secured with a University-issued security certificate. This assures visitors to the website that the business is legitimate, and that their connection to the website is secure.
Domain-joined computers on the University network should have the necessary certificates installed so shouldn't run into any trouble with invalid security certificates.
Computers that aren't domain-joined might not have the necessary certificates installed so are likely to encounter issues when a University website receives an updated security certificate.
In order to remedy this, follow these instructions:
Installing University of Otago Certificate Authority (PDF 838KB) – requires administrator privileges on the device.