# Troubleshoot Oracle cloud devices

Last validated Mar 20, 2026

If you find that your Tailscale network (known as a tailnet) nodes cannot access your [Oracle Cloud Linux VM][kb-oracle-cloud], you may need to update the VM's `iptables` configuration.

Before you modify `iptables`, make a backup of the current configuration:

```shell
sudo iptables-save > ~/iptables.old
```

Check your current `iptables` configuration by running:

```shell
sudo iptables --list --line-numbers
```

If you want to provide HTTP access from your tailnet to the VM, run:

```shell
sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 80 -j ACCEPT
sudo netfilter-persistent save
```

Alternatively, if you find a specific rule that is rejecting your ingress access, you can delete it by line number:

```shell
sudo iptables -D INPUT <line-number>
```

Check the `iptables` list again to make sure your change is in effect.

```shell
sudo iptables --list --line-numbers
```

Then, try accessing the Oracle Cloud Linux VM from your tailnet node again.

[kb-oracle-cloud]: /docs/install/cloud/oracle-cloud