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I'm trying to install a QGIS web server on windows 7 (64 bit), and request maps on HTTP. I followed this tutorial: http://hub.qgis.org/projects/quantum-gis/wiki/QGIS_Server_Tutorial

I installed apache separately (via xampp), because if I installed it via the osgeo4w setup, it gave me errors saying that the DLLs of IPP codec pack are missing. I also disabled FastCGI, because that gave me some other kind of errors. Now I got to the point where the server works, it starts up, and it answers to requests on HTTP. The problem is that it always sends back a black white picture. I checked the .qgis project file several times and everything is fine. I tryed adding layers through WMS to the QGIS desktop app, and I was successfull, and got a nice map in the desktop app.

What could the problem be, why does the server send back a blank picture?

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    Most often a blanc image in WMS means that the client has requested a map from an area where the server does not have any data. Check the BBOX and SRS/CRS which are used in GetMap requests. – user30184 Apr 3 '16 at 14:35

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