Preferably use a single-hex socket if you can get one long enough to fit over the nipple, or a single-hex ring spanner if you have one.
Otherwise use a good fitting ring spanner and heat up the frame tube where the strainer nut screws in which will expand the tube slightly and allow the strainer to undo easier.
To heat it, use a propane torch, or a heat gun would be better than nothing.
Keep heating it until you can undo it.
Bob
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Remember that Assumption is the mother of all f**k-ups.
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