Couldn't resolve host, and I haven't found solution how to solve this

Running with gitlab-ci-multi-runner 1.4.1 (fae8f189) Using Docker executor with image ubuntu:14.04 ... Pulling docker image ubuntu:14.04 ... Running on runner-a8b3a433-project-1299613-concurrent-0 via ajcastro-K555UB... Cloning repository... Cloning into '/builds/ajcastro29/workflow-test'... fatal: unable to access 'https://gitlab-ci-token:xxxxxx@gitlab.com/ajcastro29/workflow-test.git/': Couldn't resolve host 'gitlab.com' ERROR: Build failed: exit code 1