Making rest request on linux build agent

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C#

I have a Linux Build Agent(Docker) on TeamCity, I am running into an issue, I have tests that I do API requests and I am not able to make requests to those endpoints when the build is running on TeamCity.

Locally using 'IPAddress.Loopback' will get 127.0.0.1, for the port I have a utility class that returns a free address.

var _localHost = "http://127.0.0.1:44393";
RestClient client = new RestClient(new RestClientOptions(_localHost)
	{ Authenticator = new HttpBasicAuthenticator("ApiUser", "pwd") });
RestRequest request = new RestRequest("/ClientConfiguration/enabledcleints/2");

What I have tried:

As I know that IPAddress.Loopback would not work on the agent I have tried with the following

- IpAddress of the build Agent
- 172.26.0.1 (this I read somewhere is default for docker)
- 172.17.0.2 (same for this)