According to the docs, there should be no problem using ArcGIS Server 10.3.1 with arcgis Desktop 10.6.
However, I recently added a few rasters with 10.6 to an old Raster mosaic which was created with 10.3.1. This Mosaic cannot be published now. - no errors, just "cannot read dataset".
So what do I do now?
Thanks for any help.