Confirmed a UPI installation of 4.5 is using TCP for the health checks on both the internal and external load balancers with the /readyz endpoint with 4.5.0-0.nightly-2020-09-16-180742
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (OpenShift Container Platform 4.5.11 bug fix update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
*** Bug 1872822 has been marked as a duplicate of this bug. ***