Domain Join fail error while launching Admin EC2 for managed directory

Question

Hello,
we have launch our Directory Service and trying to launch Admin Ec2 instance to manage The users and all, but when we start the execution to launch admin EC2 instance it is failing on the step of domain join, and giving following error,

>
```
Step fails when it is verifying the command has completed. Command b1de3f81-5da6-4fc2-a199-f2426c67cf46 returns unexpected invocation result: {Status=[Failed], ResponseCode=[1], Output=[status:Failed, code:0, message:Domain Join failed, ComputerName:EC2AMAZ-0DB4A8N; Message:A WebException with status ConnectFailure was thrown.; ErrorCode:; ErrorType:Amazon.Runtime.AmazonServiceException; StatusCode:0, error: Domain join failed. ----------ERROR------- Failed to create domain computer account 'EC2AMAZ-0DB4A8N', Message=A WebException with status ConnectFailure was thrown.,ErrorCode=,ErrorType=Sender,StatusCode=0 Amazon.Runtime.AmazonServiceException: A WebException with status ConnectFailure was thrown. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 52.95.35.27:443

```
Though my Directory and instance are in same private subnet.

can anyone please help me to debug the actual cause of this issue?

Answer

Hello.

If you look closely at the error, it's accessing a public IP address.  
This makes me think that even though they are in the same subnet, they are accessing the domain via the public IP.  
Therefore, I think you can use it by configuring the private subnet to access the public Internet using something like NAT Gateway.  
```
52.95.35.27:443
```

Domain Join fail error while launching Admin EC2 for managed directory

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