[Koha] Using different port

Hi there, I've installed koha-common debian package on a debian stable machine, but I am using a different port to access the stuff client and also the opac because I am behind a modem that already has the ports 80 and 8080 assigned to another server. Anyway It seems that zebra is not working after importing the database: searching gives no results. Do I have to configure zebra or pazpar2 for using a different port? Thanks Marius