Push not working: Authentication failed

Hi, i have configurated gitlab-ci and all work fine, except when i try to push commits to server. runner get the project correctly under gitlab runner folder then in the script i do some commit, and i would like to push changes to server. When i do:

git push origin master

i get this error:

Fatal: Authentication failed for 'http://gitlab-ci-token:49e039f81728715ef3548cb1253f6b@192.168.0.47/Project/MyProject.git/'

what's wrong? runner configuration seem correct because project read well..

I need to push because in gitlab-ci i configured a stage who manage project versioning, so in my script i update all project module versions and push the updated files to server.

there is a workaround?

i need to do this in production environment, so this task is very urgent for me..

Thanks