[Koha] Firefox can't establish a connection to the server at localhost:8080.

I have installed Koha but cannot access it. I get: Firefox can't establish a connection to the server at localhost:8080. What may I do to open port 8080 and make it listenable for Koha? Thanks for any help you can offer. Regards, ~Iman -- A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects. — Robert Heinlein’s