What forces would make leaving a planet impossible?

My idea is to have a place that is "inescapable" by any conventional propulsion system, except it has Earth-like conditions: a breathable atmosphere, 1.0g gravity, etc.

What would have to be the composition of a planet in order to make it virtually "inescapable"?

I've considered placing it near the event horizon of a black hole or having the atmosphere be simply much "thicker" than earth's 300m/480km atmosphere but I was wondering if there is a scientific reason why a ship would suddenly just "stop working" at a certain altitude, magnetic force, etc.

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What forces would make leaving a planet impossible?

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