Back in another part of my career I worked a lot with putting Macs on ActiveDirectory. And there was a common refrain from Apple about bugs in that implementation: "works on 17!".

The joke is that Apple owns the 17.x.x.x class-A range on the Internet (they got in early, the also have a second class-B and used to have a second class-B that they gave back), and what engineers were really saying is that they could not reproduce on the AD systems that Apple had setup (lots of times it was because AD had been setup with a .local domain, a real no-no, but it was in Microsoft's training materials as an example at the time...).