You have been supporting in a great way. I need one more help from the technical team.
Even I am facing the same issue. I am using TeamCity version: TeamCity Enterprise 2017.2 (build 50574)
Whenever I try to connect to VSTS, it says connection time out error.
I have set the proxy in the server where TeamCity is hosted and able to connect to VSTS repos in the browser from the same server.
But still not able to connect in TeamCity application.
I have also set the "teamcity.tfs.useSystemProxy=true" in the internal properties file of TeamCity. but no luck.
Can anyone please help in this.