I had this exact problem with one of my Corian bathroom sinks. As already suggested, I cleaned off the old glue on the hose and the sink. Then I squeezed out a bead of silicone bathroom caulk and smoothed it around the hose. I slipped it back in the hole and jammed a soft sponge between the hose fitting and the post under the cabinet. Once the silicone dried, I removed the sponge. The hose has been leak proof for more than a year now. Good luck.
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