I am trying to call external REST API from standalone AWS Lambda function(It is not having any VPC or other services attached to it). When I execute the Lambda function, its returning System.Net.Http.HttpRequestException: Name or service not known ---> System.Net.Sockets.SocketException (0xFFFDFFFF): Name or service not known error. Can anyone help me here how to fix this? REST API and AWS Lambda functions are written in C#.