Hi Javier, *,
Check the man pages (man req), the -x509 option is for a self signed cert (root), while the -new option produces a new cert request (so you are asking for conflicting tasks). In this case no request is needed because the it's the root cert. Your config option is ok. This way a root and its asociated private key. openssl req -x509 -newkey rsa:1024 -keyout cakey.pem -out cacert.pem -days 1095 Okay, that went fine! Thanks for your help. Now I tried to work through the KB-Article but I don't get it to be honest. As far as I can say that I understood what the Exchange wants for a type of certificate I say that the Exchange2007 Server expects a file *.cer. To get this I should somehow get a *.txt file to convert that into a *.cer. Am I right? What do I have to do to get a *.txt file to be able to convert that into a *.cer? Any help I might get from you on the list is highly appreciated cause I'm stuck in the middle of nowhere :-( Kind regards Niels -- View this message in context: http://www.nabble.com/cannot-create-openssl-master-certificate-on-my-Exchange2007-Server%21Help-needed%21-tp24583342p24602436.html Sent from the OpenSSL - User mailing list archive at Nabble.com. ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org