How to detect which certificate is necessary for a certain web page?

[Guest Jerome Biau]

When I go to certain web pages then occasionally additional certificates are necessary.

When I call e.g.

 

https://kaul.inf.fh-bonn-rhein-sieg.de/home...lien/05_jsf.pdf

 

then Internet Explorer 7 informs me at first:

 

"There is a problem with this website's security certificate.

The security certificate presented by this website was not issued by a trusted certificate authority.

Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server.

We recommend that you close this webpage and do not continue to this website.

Click here to close this webpage.

Continue to this website (not recommended)."

 

 

 

Ok, I can click on the link "Continue to this website" but assume I want to remove this intermediate, unnecessary

step in the future by installing the required certificate permanently.

 

How can I find out which root certificate EXACTELY is required?

 

Jerome