Today while setting up an ssl certificate i obtained for my new installation of activecollab i ran into this error:
VirtualHost *:80 — mixing * ports and non-* ports with a NameVirtualHost address is not supported, proceeding with undefined results
To fix this i found out i have to add this to the beginning of my virtual host
NameVirtualHost *:443
Also I had to change
<VirtualHost *>to
<VirtualHost *:443>