Hi,

It works for me with current QGIS master if I paste this exact url in URI with 
HTTP/HTTPS/FTP
type : http://latuviitta.kapsi.fi/data/dem10m/dem10.tif

Did you not add the /vsicurl in URI field ?

Else it's indeed an issue with your proxy settings. Could you try
somewhere there is no proxy, see if it works ? 

Kind regards,
Julien

> Hi,
>
> I have a DEM file http://latuviitta.kapsi.fi/data/dem10m/dem10.tif on my 
> server. GDAL can access it fine through /vsicurl/ as can be verified with
> gdalinfo /vsicurl/http://latuviitta.kapsi.fi/data/dem10m/dem10.tif
>
> However, I cannot add this URI as a raster layer by using a protocol like in 
> the tutorial https://www.cogeo.org/qgis-tutorial.html. The error message is:
> CRITICAL    Invalid Layer : GDAL provider Cannot open GDAL dataset 
> /vsicurl/http://latuviitta.kapsi.fi/data/dem10m/dem10.tif:
>              Raster layer Provider is not valid (provider: gdal, URI: 
> /vsicurl/http://latuviitta.kapsi.fi/data/dem10m/dem10.tif
>
> I had the debugging tools open during my trials and it seems that QGIS did 
> not send any HTTP request. I am behind a proxy but I can access WMS and WMTS 
> services so my network settings seem to be right. The vrt file workaround did 
> not work either. What should I try next?
>
> I am using QGIS 3.18.1 from OSGeo4W.
>
> -Jukka Rahkonen-
>
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