In the QGIS WMS connection dialogue there is a checkbox telling QGIS to ignore the service URL advertised by QGIS server. Checking this option should solve the problem.

It's generally a good idea to have this option ticked. There has been talk about setting it by default.

In the QGIS WMS connection dialogue there is a checkbox telling QGIS to ignore the service URL advertised by QGIS server. Checking this option should solve the problem. (Source: QGIS Mailinglist)

It's generally a good idea to have this option ticked. There has been talk about setting it by default.