Aws-lambda-dotnet: 无法连接到 MongoDB Atlas

我写了一个简单的 AWS Serverless ASP Net Core 2.0 WebAPI
这将连接到 MongoDB Atlas 数据库。 但它不起作用。 它正在超时。
我在本地测试，它有效。 我发布到 Azure it Works。

我怀疑这是由 AWS CloudFormation firewall 引起的。

当我发布到 AWS Serverless 时，它给出了错误：

502错误的网关

{
"message": "内部服务器错误"
}

我检查了日志，

Unhandled Exception: System.TimeoutException: A timeout occured after 30000ms selecting a server using CompositeServerSelector{ Selectors = MongoDB.Driver.MongoClient+AreSessionsSupportedServerSelector, LatencyLimitingServerSelector{ AllowedLatencyRange = 00:00:00.0150000 } }. Client view of cluster state is { ClusterId : "1", ConnectionMode : "ReplicaSet", Type : "ReplicaSet", State : "Disconnected", Servers : [{ ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/cluster0-shard-00-00-3lmjx.mongodb.net:27017" }", EndPoint: "Unspecified/cluster0-shard-00-00-3lmjq.mongodb.net:27017", State: "Disconnected", Type: "Unknown" }, { ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/cluster0-shard-00-01-3lmjx.mongodb.net:27017" }", EndPoint: "Unspecified/cluster0-shard-00-01-3lmjx.mongodb.net:27017", State: "Disconnected", Type: "Unknown" }, { ServerId: "{ ClusterId : 1, EndPoint : "Unspecified/cluster0-shard-00-02-3lmjq.mongodb.net:27017" }", EndPoint: "Unspecified/cluster0-shard-00-02-3lmjq.mongodb.net:27017", State: "Disconnected", Type: "Unknown" }] }.

如何调试和解决这个问题？

我的 serverless.template

{
  "AWSTemplateFormatVersion" : "2010-09-09",
  "Transform" : "AWS::Serverless-2016-10-31",
  "Description" : "An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",

  "Parameters" : {
    "ShouldCreateBucket" : {
      "Type" : "String",        
      "AllowedValues" : ["true", "false"],
      "Description" : "If true then the S3 bucket that will be proxied will be created with the CloudFormation stack."
    },  
    "BucketName" : {
        "Type" : "String",
        "Description" : "Name of S3 bucket that will be proxied. If left blank a new table will be created.",
        "MinLength" : "0"
    }
  },

  "Conditions" : {
    "CreateS3Bucket" : {"Fn::Equals" : [{"Ref" : "ShouldCreateBucket"}, "true"]},
    "BucketNameGenerated" : {"Fn::Equals" : [{"Ref" : "BucketName"}, ""]}
  },

  "Resources" : {

    "ProxyFunction" : {
      "Type" : "AWS::Serverless::Function",
      "Properties": {
        "Handler": "AWSServerless1::AWSServerless1.LambdaEntryPoint::FunctionHandlerAsync",
        "Runtime": "dotnetcore2.0",
        "CodeUri": "",
        "MemorySize": 256,
        "Timeout": 30,
        "Role": null,
        "Policies": [ "AWSLambdaFullAccess" ],
        "Environment" : {
          "Variables" : {
            "AppS3Bucket" : { "Fn::If" : ["CreateS3Bucket", {"Ref":"Bucket"}, { "Ref" : "BucketName" } ] }
          }
        },
        "Events": {
          "PutResource": {
            "Type": "Api",
            "Properties": {
              "Path": "/{proxy+}",
              "Method": "ANY"
            }
          }
        }
      }
    },

    "Bucket" : {
        "Type" : "AWS::S3::Bucket",
        "Condition" : "CreateS3Bucket",
        "Properties" : {
            "BucketName" : { "Fn::If" : ["BucketNameGenerated", {"Ref" : "AWS::NoValue" }, { "Ref" : "BucketName" } ] }
        }
    }
  },

  "Outputs" : {
    "S3ProxyBucket" : {
        "Value" : { "Fn::If" : ["CreateS3Bucket", {"Ref":"Bucket"}, { "Ref" : "BucketName" } ] }
    }
  }
}