I successfully replaced expired certificates of an other provider by using Certbot for Apache2 on Ubuntu 14.4 but now, when I open the Web page “xyz.domain.com” only an index page instead of “redmine (an Issue Tracking Tool”) is opened. Any ideas?
This doesn’t seem to have anything to do with Let’s Encrypt setup or certificate issuance, but rather how you configured your web server. You would probably have better luck in the Redmine support forums.
this is only half of the truth because everything worked fine with a ssl certificate of an other provider.
So using the Certpobot causes me the access to my web application. Any further Ideas?
You need to specify in which method you have added certbot and about the rewrite rules you have added in it . Its not certbot issue.