Nextcloudpi port trouble with existing raspberry pi?

Hi,

i have a raspberry with pi-hole running and today i installed nextcloudpi via
curl -sSL https://raw.githubusercontent.com/nextcloud/nextcloudpi/master/install.sh | sudo bash

But i can´t reach it with 192.168… :4443 or 443.
Seems to be a problem with the apache server and the previous installations.
How can i check the ports an change it if it is needed?

thanks
oliver