I'm trying to hang a curtain rod over a sliding glass door, but keep hitting something that I can't drill through.

Christine T
by Christine T
The house is built of cement blocks, but there is drywall on the walls. I had another house that was the same type, but never had a problem with hanging curtain rods. The anchors can't get in far enough to hold the rod in with whatever is stopping it. Any suggestions would be greatly appreciated.
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