nuget - TeamCity - Behind Proxy causing build failure -

below error message getting trying build current project, behind enterprise proxy has happened morning after building fine past couple of months.

the current installed version of nuget 2.8.3 , nuspec 3.0.0.

i see says needs credentials has never happened before , not sure how around in teamcity.

also other solutions building fine makes more confusing built on same template.

okay, if less impatient , did tracking on check-ins, have noticed had checked in .nuget/packages.config. had dependencies on these packages above.

i removed these .nuget/packages.config , resolved issue.

hope if in future having similar issues too.