Bought a new Hik 3MP dome off Amazon. Tried admin:12345, no luck, then remembered Ethan's article about the new firmware password requirements, Hikvision Anti Hacking Firmware Tested, and was resigned to use SADP to set up a unique password with the new constraints.
Then I remembered seeing recently in a RTSP URL database somewhere a username pass like admin:123456789abc, so I tried it.
It worked. Is this something that middlemen are doing to reduce support costs, or??