  We consider closed free tensionless strings in $AdS_d$, calculate exactly the
boundary/boundary string evolution kernel and find the string dynamics to be
completely frozen. We interpret therefore the boundary configurations as Wilson
loop operators in a confining phase. This is taken as an argument in favor to
the dual weakly coupled abelian gauge theory being that of $(d-4)$-forms in the
$(d-1)$ dimensional boundary Minkowski space.
