I recompiled OpenSSL to make s_server -www return the correct, static XML blob for a .NET application that was buggy to make a reproducer for them that didn't rely on our product at all and which could be self-contained on a very barren windows VM they could play with to their heart's content and which didn't even care about the network because everything was connecting via loopback, so they couldn't blame that, eitehr.

Turns out there was a known bug in Microsoft schannel that had yet to be patched and they'd wasted weeks of our effort by not searching their own bug tracker properly.

Searching bug trackers has always been problematic unless you have an exact error message or code. Fortunately vendors like Linear are now embedding AI/LLM technology into their products, which helps a lot with fuzzy searching and with retroactively finding duplicate bug reports.