Hi all,
I can browse both IPv4 and IPv6 sites without issue if I am using Transparent proxy with no authentication. If I switch on "Agent" authentication I cannot browse IPv6 sites, I get an authentication error (see image).
This is similar to umt_kid's thread but not the same, I think. https://community.sophos.com/products/unified-threat-management/astaroorg/f/110/t/70391
I don't see anything in the Client Authentication log either.
Paul