Is it windows container or linux container?

It's a linux container.

For a particular job, OneDev will create a docker bridge network to run all containers inside it. You may control its gateway/subnet etc with network options in relevant executor.

Yes, that is what I tried by entering "create --subnet=172.17.0.0/16" which docker refused to do with the following error message: Failed to run command: docker network create --subnet=172.17.0.0/16 ServerDockerExecuter-76-20-0, return code: 1 Error response from daemon: Pool overlaps with other one on this address space. This makes sense, because this is the "bride" network used on our portainer where onedev is running in. That is somewhat sad, because in that net is running a NuGet server to which I want to push our compiled packages. But maybe I just need to put the NuGet server into another net.

Not sure what happens there. You may experiment with docker bridge network options outside of OneDev, and start container within the network to see if there is some option there to make containers able to connect to your NuGet server.

I'll try a few things. Thank you for your support. You can close this ticket. I'll revisit it if I have further questions.

OK. I am closing it now. If there is any improvements need to be done at OneDev side, please let me know.