Hello,
Your Web Admin, page definition for the intended HTTPS port is:
icm/HTTP/admin_1 = PREFIX=/sap/admin,DOCROOT=$(DIR_DATA)$(DIR_SEP)icmandir,AUTHFILE=$(icm/authfile),PORT=84$$
"$$" will be replaced by the instance number of the Web Dispatcher (parameter SAPSYSTEM).
Unless the instance number is 43, your icm/HTTP/admin_1 parameter is incorrectly defined.
You can replace "84$$" for "8443", restart the Web Disp. and see how it goes.
Cheers,
Isaías