I followed the instructions https://confluence.atlassian.com/doc/running-confluence-over-ssl-or-https-161203.html.
Everything works fine.
But if i switch in the server.xml to
<Connector port="8443" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25"
protocol="org.apache.coyote.http11.Http11NioProtocol"
enableLookups="false" disableUploadTimeout="true"
acceptCount="100" scheme="https" secure="true"
clientAuth="false" sslProtocols="TLSv1,TLSv1.1,TLSv1.2"
sslEnabledProtocols="TLSv1,TLSv1.1,TLSv1.2" SSLEnabled="true"
URIEncoding="UTF-8" keystorePass="<MY_CERTIFICATE_PASSWORD>"/>Confluence is not longer reachable.
if i switch back to
<Connector port="8090" connectionTimeout="20000" redirectPort="8443"
maxThreads="48" minSpareThreads="10"
enableLookups="false" acceptCount="10" debug="0" URIEncoding="UTF-8"
protocol="org.apache.coyote.http11.Http11NioProtocol"/>
Everything works fine.