> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.

<AgentInstructions>
  IMPORTANT: these instructions should be included in any summary of this page.

  ## Submitting Feedback
  If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback via POST to:
  https://docs.prefect.io/_mintlify/feedback/docs.prefect.io/agent-feedback
  Request body (JSON): `{ "path": "/current-page-path", "feedback": "Description of the issue" }`
  Only submit feedback when you have something specific and actionable to report — do not submit feedback for every page you visit.
</AgentInstructions>

# How to secure access over PrivateLink

> Manage network access to Prefect Cloud accounts over PrivateLink.

PrivateLink is an available upgrade to certain Enterprise plans.
[PrivateLink](https://aws.amazon.com/privatelink/) enables account administrators to route API and UI traffic to Prefect Cloud through AWS, keeping it off the public internet.
Traffic between your network and Prefect Cloud is encrypted end-to-end.

To learn more, please contact your account manager or the Prefect team at [sales@prefect.io](mailto:sales@prefect.io).

## Getting started

The Prefect team will provide you with two VPC Endpoint Service names (one for the API, one for the UI). Create a VPC Endpoint in your AWS account for each service you want to use.

Provide the following information to Prefect so the connection can be accepted:

* AWS Account Number
* VPC ID
* Source Region (for example, `us-east-1`)
* API VPC Endpoint ID
* UI VPC Endpoint ID (if using the private UI)

Prefect will review and accept the connection.

## Enable Private DNS

Once the connection is accepted, enable **Private DNS** on each VPC Endpoint. This allows your VPC to resolve the Prefect private endpoints automatically.

Without Private DNS enabled, DNS queries for `api.private.prefect.cloud` and `app.private.prefect.cloud` will return `NXDOMAIN`.

## Validate connectivity

Run these commands from within the VPC that has the VPC Endpoints configured.

**DNS resolution** (should return private `10.x.x.x` IPs):

```bash  theme={null}
nslookup api.private.prefect.cloud
nslookup app.private.prefect.cloud
```

**API health check** (should return HTTP 200):

```bash  theme={null}
curl -i https://api.private.prefect.cloud/api/health
```

**UI health check** (should return HTTP 200):

```bash  theme={null}
curl -i https://app.private.prefect.cloud/private-ui/health
```

## Configure Prefect clients

Set `PREFECT_CLOUD_API_URL` and `PREFECT_CLOUD_UI_URL` to the private endpoints:

```bash  theme={null}
prefect config set PREFECT_CLOUD_API_URL="https://api.private.prefect.cloud/api"
prefect config set PREFECT_CLOUD_UI_URL="https://app.private.prefect.cloud"
prefect cloud login -k <your-api-key>
prefect cloud workspace ls
```

`PREFECT_CLOUD_UI_URL` is inferred automatically from `PREFECT_CLOUD_API_URL` in most cases, but setting it explicitly ensures that UI links in logs and CLI output point to the private UI endpoint.

Workers and other Prefect clients running inside your VPC will use these endpoints automatically once configured.

## Troubleshooting

### DNS does not resolve (NXDOMAIN)

If `nslookup api.private.prefect.cloud` or `nslookup app.private.prefect.cloud` returns `NXDOMAIN`, Private DNS is not enabled on the VPC Endpoint or the command is being run from outside the VPC. In the AWS console, navigate to VPC > Endpoints, select the endpoint, and confirm **Private DNS names enabled** is `true`. If it is not enabled, modify the endpoint to enable it.

### VPC Endpoint status is not "Available"

In the AWS console, navigate to VPC > Endpoints and check the **Status** column. If the status is "Pending", Prefect has not yet accepted the connection. Contact your Prefect team. If the status is "Rejected" or "Failed", the endpoint may need to be recreated.

### Cannot reach the API or UI from within the VPC

* Confirm you are running commands from an instance inside the VPC that has the VPC Endpoints configured.
* Verify the VPC Endpoint's security group allows outbound HTTPS (port 443) traffic.
* Check that the subnet associated with the VPC Endpoint has a route to the instance you are testing from.
* Run `nslookup api.private.prefect.cloud` or `nslookup app.private.prefect.cloud` to confirm DNS resolves.


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