  The ATLAS collaboration recently recorded possible excess in the di--boson
production at the di--boson invariant mass at around 2 TeV. Such an excess may
be produced if there exist additional $Z^\prime$ and/or $W^\prime$ at that
scale. We survey the extra $Z^\prime$s and $W^\prime$s that may arise from
semi--realistic heterotic string vacua in the free fermionic formulation in
seven distinct cases including: $U(1)_{Z^\prime}\in SO(10)$; family universal
$U(1)_{Z^\prime}$ not in $SO(10)$; non--universal $U(1)_{Z^\prime}$; hidden
sector $U(1)$ symmetries and kinetic mixing; left--right symmetric models;
Pati--Salam models; leptophobic and custodial symmetries. Each case has a
distinct signature associated with the extra symmetry breaking scale. In one of
the cases we explore the discovery potential at the LHC using resonant
leptoproduction. Existence of extra vector boson with the reported properties
will significantly constrain the space of allowed string vacua.
