Have you tried closing every application before starting FlashFXP?
mIRC can conflict with FlashFXP based on your mIRC settings, make sure identd is only enabled while connecting. Same with FlashFXP.
There has to be some other application listening on this port. If you can't find a program I'd recommend you do a adware/spyware scan and make sure you don't have some hidden application running on your computer.
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