We've all had that page pop up telling us there is a problem with the certificate and some of us continue on anyways and others run away to a safer competing site. But what to do when you get the error - is it your problem or theirs? What can you do?
The answer depends on what the reason for the security warning is. Things will vary slightly depending on the browser type and version, but there should be a 'show details' area near the end of the message. There are 3 flavors of errors that will be seen on the client end here is the paraphrased listing:
1) Name mismatch - try entering the servername portion of the URL exactly as it shows it in the certificate (click the View Certificate button in the error message box or use the gold lock next to the address bar or down in the bottom right corner to show the cert). For example, if you were going to https://server/index.htm
and it got the warning - the certificate may be for server.domain.com, so you should instead go to https://server.domain.com/index.htm and the error should go away.
2) Certificate expired or not yet valid - usually means it expired - renew the cert if it is your server, or else contact the company of that site and ask them to update it.
3) Untrusted root - if the root certificate for the site is not already in your trusted root cert store, you will need to import that. This is common if the site is using their own CA instead of a commericial vendor, or if they had generated a self-signed …