SonarQube server [https://sonarcloud.io] can not be reached

Using an Azure DevOps build pipeline.

Trying to analyze a .NET solution.

RunCode Analysis task errors out with:
SonarQube server [https://sonarcloud.io] can not be reached

I am running build agent behind a corporate proxy. I have tried adding the values:

http.proxyHost=url to my proxy
https.proxyHost=url to my proxy
http.proxyPort=my port
https.proxyPort=my port

to the “Prepare analysis on SonarCloud” task, but still the same error

Can you share how you specify this? Looking at Run SonarCloud Analysis through corporate proxy, this should work.

Corporate firewall was preventing communication. All is well, now.