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I'm trying to set up a Outline VPN server on my Oracle Cloud Instance. However I keep getting the error

You won’t be able to access it externally, despite your server being correctly set up, because there's a firewall (in this machine, your router or cloud provider) that is preventing incoming connections to ports 37019 and 3029.

I tried individually opening ports using the command

firewall-cmd --zone=public --add-port=37019/tcp --permanent

However the port numbers keep changing after I open them. So is there a way to open all the TCP and UDP ports at once?

Aeden Thomas
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1 Answers1

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To "open all the TCP and UDP ports at once" is in many cases more less equivalent to either:

  • disabling your firewall completely (typically not what you want or need)

  • white-listing a source (which is no problem when that concerns specific ip-addresses or ranges and not from everywhere) for example with:

    firewall-cmd --zone=public --permanent --add-source=192.168.1.0/24

But note that in many cloud environments, as that error message already indicates, in addition to a host based firewall (the iptables rules you manage with firewall-cmd) there will be a firewall / network access list / security policy managed outside of the instance itself. That can also be the reason specific ingress/egress traffic is blocked.
In Oracle cloud that is for example:
https://docs.oracle.com/en-us/iaas/Content/Network/Concepts/securityrules.htm

Bob
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