I bought a SSL Cert which should work with iE 5+, but it doesn`t. All other browsers i tested work perfectly - no errors - just the site I want to display. But IE8 and small
You must have configured multiple certificates using Server Name Indication without knowing it.
If you use this, you get a self-signed certificate:
openssl s_client -showcerts -connect www.minol-fb.de:443
If you use this (with the server name), you get the correct certificate:
openssl s_client -showcerts -connect www.minol-fb.de:443 -servername www.minol-fb.de
You probably get a different behaviour with older versions of IE because you're testing them on XP. No version of IE supports SNI on Windows XP unfortunately. Other browsers (with sufficiently recent versions) do, at least independently on the OS version they run on.
If you don't need that other host, you can probably remove that configuration, so as not to have to rely on SNI at all.