Hey there.
Just to understand if it’s an isolated problem or being faced by multiple users, are you working with the same user as on this thread?
And, I’d like to know:
- What operating system / version are your self-hosted agents?
- What version of the Azure DevOps agent is installed?
- When did the problem start (you said it was working fine before)?
SonarCloud is expected to work on self-hosted servers that have access to the internet. And, you cannot use static IP addresses to allow outbound traffic to SonarCloud (as you mentioned, the IP addresses change regularly).
It would also be useful if you could run a tracert sonarcloud.io or traceroute sonarcloud.io (depending on the OS being used) and paste the results here.