A problem with open a link of uinversity

Hello,

Hi everyone,

When I enter some link of a university I faced this picture which is down and I have tried that in both IE and FireFox.

This message which IE shows me
Network Error (ssl_server_cert_untrusted_issuer)
Your request contacted a host which presented a certificate signed by an untrusted issuer.
This is typically caused by a Web Site presenting an incorrect or invalid certificate, but could be because of a configuration error.
For assistance, contact your network support team.


On the othere hand, this is the message which FireFOx shows me
Your request contacted a host which presented a certificate signed by an untrusted issuer.
This is typically caused by a Web Site presenting an incorrect or invalid certificate, but could be because of a configuration error.


[URL=http://imageshack.us/photo/my-images/221/ksun.png/][IMG]http://img221.imageshack.us/img221/1224/ksun.png[/IMG][/URL]

however, I am pretty sure that link of university is quite trusted, so what can I configure in the browsers to grant that site open without a problem.

I would highly appreciate your help.