Conection ERROR to gitlab in local server

Hi everyone

I have a gitlab local server and a jenkins local server and I am trying to make a conection between both but make me this error, Can anybody helpme with this?

Failed to connect to repository : Command “/lib/git-core/git ls-remote -h – http://ip:port/gitlab-instance-4d176f16/pruebasjose HEAD” returned status code 128:
stderr: fatal: unable to access ‘http://ip:port/gitlab-instance-4d176f16/pruebasjose/’: The requested URL returned error: 407

I have a horrible proxy rolling for all so maybe will that be the problem?

Best regards boys.