## Allowlists and firewalls

URL: https://docs.atlan.com/apps/connectors/etl-tools/dbt/how-tos/allowlists-and-firewalls

> Everything IP- and firewall-related for dbt - dbt Cloud's IP restrictions feature, and storage-side firewalls for dbt Core buckets.

Everything IP- and firewall-related for dbt, in one place: dbt Cloud's IP restrictions feature, and storage-side firewalls for dbt Core buckets.

## Do I need this page?

| Situation | Applies? |
|---|---|
| dbt Cloud with **IP restrictions** enabled (Account settings → IP restrictions) | **Yes** - allowlist Atlan's NAT IP or every call fails |
| dbt Cloud, no IP restrictions | No - Atlan connects with just the token |
| dbt Core, bucket has a firewall / "selected networks" rule / explicit-deny bucket policy | **Yes** - the storage firewall section below |
| dbt Core, open (IAM-only) bucket access | No - Phase 2 of the [Core guide](https://docs.atlan.com/llms/connectors/dbt/connect-dbt-core-via-a-storage-bucket/llms.txt) is all you need |

## dbt Cloud IP restrictions

1. Ask Atlan support for your tenant's **static outbound NAT IPs** (they're tenant-specific - see [Atlan Network Details](https://docs.atlan.com/llms/governance/administration/atlan-network-details/llms.txt)).
2. Your dbt Cloud admin adds every one of them to **Account settings → IP restrictions → allowlist** in dbt Cloud.
3. Re-run **Test Authentication** in Atlan.

When IP restrictions block Atlan, the error reads *"Access forbidden. Please check your dbt Cloud token permissions."*—it says nothing about IPs. If the token has the correct permissions and you still see this error, IP restrictions are almost certainly the cause.

## Storage-side firewalls (dbt Core)

### AWS S3

- **Explicit denies win.** A bucket policy with an explicit `Deny` overrides every Allow - Atlan's role can have perfect permissions and still get `AccessDenied ... with an explicit deny in a resource-based policy`. Ask your cloud team to check for deny statements scoped by VPC, IP, or organization.
- **KMS counts as a second gate.** Encrypted bucket → the role also needs `kms:Decrypt` on the key.

### Azure storage firewall - same-region trap

If your Atlan tenant and your storage account are in the **same Azure region**, traffic between them travels Azure's internal network and **never presents a public IP** - so IP allowlist rules on the storage firewall can never match it, and allowlisting Atlan's NAT IP achieves nothing. Options that do work:

- A **resource-instance exception** on the storage firewall for Atlan's managed identity (ask support for the identity's details), or
- Temporarily relaxing the firewall to confirm the network is the blocker, then choosing a permanent mechanism with support.

### Google Cloud Storage

- Access is IAM-based: the service account needs `roles/storage.objectViewer` **on the specific bucket**. A grant on a different bucket or project produces `Error 403 ... does not have storage.objects.list access`.
- If you use VPC Service Controls around the bucket, involve Atlan support - the perimeter must admit Atlan's identity.

## When Atlan's IPs change

Rare and announced in advance by email to tenant admins, with an overlap window (see [Atlan Network Details](https://docs.atlan.com/llms/governance/administration/atlan-network-details/llms.txt)). If dbt Cloud calls start failing right after such a notice, your allowlist is still on the old IPs.

_Last updated: 20 August 2026._

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