Ceiling Fan w/remote, capped off red - but now dawn to dusk sensor on porch only stays on
Before you do anything else try resetting the wall switch for the porch light. When you turned off power to the fan (and the porch light) it probably affected the sensor setting. Check your instructions for resetting the sensor from your installation pamphlet or on-line.
The red wire in the fan is probably only part of the switch loop you're not using any longer.