Error while updating the package castle core package to 4.4.1.0

After updating the castle core package i am facing the following exception .i am using moq 4.13 .assembly binding i mentioned as following. please help in resolving this issue.

bindingRedirect oldVersion="0.0.0.0-4.4.1.0" newVersion="4.0.0.0"

Project C:\mypath on node 1 (DemoBuild target(s)).RESTOREPACKAGES:" C:\mypath .nuget\NuGet.exe" update -self Checking for updates from https://api.nuget.org/v3/index.json. C:\mypath \build\build-git.config(118,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json. C:\mypath \build\build-git.config(118,5): error : An error occurred while sending the request. C:\mypath \build\build-git.config(118,5): error : Unable to connect to the remote server C:\mypath \build\build-git.config(118,5): error : No connection could be made because the target machine actively refused it C:\mypath \build\build-git.config(118,5): error MSB3073: The command "" C:\mypath .nuget\NuGet.exe" update -self" exited with code 1.Done Building Project " C:\mypath \build\build-git.config" (DemoBuild target(s)) -- FAILED.

Build FAILED.