How other user can connect to Gitlab Community Edition which is installed on server

I have set up a GitLab Community Edition on window machine successfully and created a repository into that but just wanted to know that if my colleague is working on some other module on his local machine and he wanted to push the code on the same repository which I was created then will he able to push code on this port and if yes then how as he is facing issue while pushing the code ?fatal error from other userpc