[solved] TcpServer can't work under ubuntu, but works under windows

Hello, I’m trying to create a tcp server. The same code works fine under windows. But under linux, I can’t connect at all. I’m listening QHostAddress::Any, port = 8080. If I type http://localhost:8080/ inside a web browser, the incomingConnection(int socket) function of the class QTcpServer never gets called under. And the connection takes forever. Do you know what the problem might be?