Security News > 2023 > May > SolarWinds Detected Six Months Earlier
iAPX May 3, 2023 6:37 AM. "Unusual traffic" is suspect traffic, that's why traffic is monitored and everything "Unusual" is logged to be audited if not immediately launching an alarm!
If they couldn't have a good network hygiene when evaluating a new solution, there are few chances they do it for production systems where it's more complex with a lot more traffic.
Including "The company's engineers were unable to find a vulnerability in their code", naturally they won't, you didn't ask people that created code with a security hole to find it: with external help to identify it and reproduce it, they could fix it.
You don't do QA by code developers, but by QA people, you don't search a flaw by code developers, you use a hacker for that matter.
News URL
https://www.schneier.com/blog/archives/2023/05/solarwinds-detected-six-months-earlier.html