some www sites use non 80 port for the content parts
(ex. http://www.fcenter.ru/products.shtml?eshop
Images on the left-bottom)

is it normal if i used switch EnableTunnelingControl=0 and get 504 error
for the those parts ?

And, for understandig, if i switch on EnableTunnelingControl=1 should i use
allowed access rule for HTTPS ? (to allow port 443 )

Nw6sp5 BM3.7sp3+last patches..