What is the default firewall

[davenovo]

Hello,
When I go to Control Panel->Security->Firewall I do not see any firewall rules present. Does that mean that by default the firewall is not active? If the firewall is active, what are the default rules?

I had presumed (perhaps incorrectly) that a firewall was active allowing only port 80. So I added a rule to allow port 8080, but that seems to have locked me out of using the NAS and I had to reset it.

Some forum posts said that there was only a single "allow" rule. Is that true? If so, what ports do I have to ensure that I allow in order to not lock myself out.

[TMzethar]

When there are no rules, the firewall defaults to fully allowed.

[Gremlin]

But:

When you add an "allow" rule you actually generate:

Allow: 8080
Deny: All (the rest)

Since the rules are read in order.
What you allow will depend on what is running on your NAS.

{Based on my limited experience of unix and the odd router firewalls I have worked with. YMMV }

[TMqiky]

The firewall is fully open by default.
Setting "Disable" will block the specified IPs and "Allow" will block other unallowed IPs.
The firewall can only choose to use "Disable" or "Allow" at the same time. If you don't need to connect to the Internet, you can directly enable "Secure Isolated Mode", which will automatically set up a firewall for you that only the LAN can access. If you are not sure which IPs can be blocked, it is recommended to use "Block" to block the range of IPs that you don't need.
The following are some of the known IP segments that cannot be disabled:
Device itself 127.0.0.1
Application center hub: 47.90.0.247
tnas.link: 119.28.31.72
cn.tnas.link: 106.14.61.188
us.tnas.link: 47.254.40.125
eu.tnas.link: 8.209.75.86
You can learn more at the following link
viewtopic.php?f=78&t=4895