My best anecdote on that is when an Ethernet wallplug was punched down with a flat screwdriver... which worked as hardware firewall for the SMB traffic. Everyth

My best anecdote on that is when an Ethernet wallplug was punched down with a flat screwdriver... which worked as hardware firewall for the SMB traffic. Everything else worked fine: ICMP, HTTP/S... but not SMB. After I re-punched it with a proner Krone it started work fine for the SMB traffic just fine.