The certificate for this server is invalid
Hi I have an iPad mini and have been on my university website several times today. Now I am getting a message
"Safari cannot open the page. The error was:The certificate for this server is invalid. You might be connecting to a server that is pretending to be 'msds.open.ac.uk', which could put your confidential information at risk." This is very strange as I am using a bookmark each time to find the page. I have no trouble getting onto my university
website from my Mac so it can't be the problem with the server. I have tried resetting the time - now set to automatic - as I noticed this had been a solution to an iTunes problems but to no effect. I have up to date software - iOS 9.3.5
I'd really appreciate any suggestions.
Thanks
iPad mini Wi-Fi