Troubleshoot Oracle cloud devices
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If you find that your Tailscale network (known as a tailnet) nodes cannot access your Oracle Cloud Linux VM, you may need to update the VM's iptables configuration.
Before you modify iptables, make a backup of the current configuration:
sudo iptables-save > ~/iptables.old
Check your current iptables configuration by running:
sudo iptables --list --line-numbers
If you want to provide HTTP access from your tailnet to the VM, run:
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:
sudo iptables -D INPUT <line-number>
Check the iptables list again to make sure your change is in effect.
sudo iptables --list --line-numbers
Then, try accessing the Oracle Cloud Linux VM from your tailnet node again.