Hello Simone,
you have to add the certificate in your Browser as trusted Root Certification Authority. In IE5.5, and I think IE6 too, you have to do the following:
1. Open the page secured by SSL with an
https://YOURURL
2. Double Click on the lock symbol in the statusbar of your browser. After this you will get an window.
3. Go to the last tab of this window "certificationpath" click on your Root Certification Athority (normaly the first entry).
4. Click on th button "show certificate". You will get an new window looks like the first.
5. Click in this new window the button "install certificate". Follow the instructions from your browser for the import of your Root CA.
Hope it helps.
Rico Schoene
rico.schoene@kaufland.de