  We introduce a novel and effective method to compute transport coefficients
in strongly interacting plasma states in holographic QFTs. Our method is based
on relating the IR limit of fluctuations on a gravitational background to its
variations providing a previously overlooked connection between boundary and
near horizon data. We use this method to derive analytic formulas for the
viscosities of an ansiotropic plasma state in the presence of an external
magnetic field or another isotropy breaking external source. We then apply our
findings to holographic QCD.
