Register gitlab-ci-multi-runner behind corporate proxy

Hello, i am trying to register the gitlab-ci using the command:

sudo gitlab-ci-multi-runner register

Error:

ERROR: Registering runner... failed runner=****** status=couldn't execute POST against https://gitlab.com/ci/api/v1/runners/register.json: Post https://gitlab.com/ci/api/v1/runners/register.json: dial tcp *********:443: i/o timeout PANIC: Failed to register this runner. Perhaps you are having network problems

I can confirm i have all proxy env variables set for the root and the user.

ftp_proxy http_proxy https_proxy

I also tried using

FTP_PROXY HTTP_PROXY HTTPS_PROXY

But i got the same error message.