I have recently be working on a release pipeline that deploys to a server behind a corporate firewall. This is done using an Azure DevOps private build agent and works fine.
As the service is a basic REST service and takes a bit of time to start-up I though a gate was a perfect way to pause the release pipeline until service was ready for the automated tests.
However, I hit a problem, the gates always failed as the internal server could not be resolved.
After a bit of thought I realised why. Gates as actual agentless tasks, they don’t run on the agent but on the server, so are outside the firewall. They could never connect to the private service without ports being opened, which was never going to happen.
So at this point in time I can’t use gates on this pipeline. Any similar logic to do the same job would have to be developed as scripts I can run on an agent.