If you use Generic XYZ for the OpenStreetMap and pass the HTTPS, do you get
the same error?
https://a.tile.openstreetmap.org/{z}/{x}/{y}.png
<http://osgeo-org.1560.x6.nabble.com/file/t195347/openstreetmapxyz.jpg>
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Sent from: http://osgeo-org.1560.x6.nabble.com/MapGuide-Users-f4182607.html