Hi Samuel,

On Tue, 2020-10-27 at 01:58 -0700, Samuel Sieb wrote:
> On 10/26/20 7:44 AM, Michael J. Baars wrote:
> > I'm writing a client and server program for cluster computation. I noticed 
> > that nmap sees a specific port as open on Fedora Server and as filtered on 
> > Fedora
> > Workstation when the server is running and sees this port as closed on 
> > Fedora Server and as filtered on Fedora Workstation when the server is not 
> > running.
> 
> You don't say which port, so it makes it impossible to give you useful 
> advice.

The exact ports are of no importance :)

> 
> > While looking into the firewalld configuration I found that Fedora 
> > Workstation and Fedora Server have one major difference their configuration 
> > files:
> > 
> >    <port protocol="udp" port="1025-65535"/>
> >    <port protocol="tcp" port="1025-65535"/>
> 
> You don't say what the difference is.  Which one has that and where?

These are Fedora Workstation configuration settings.

> 
> > After removing these specific lines from 
> > /etc/firewalld/zones/FedoraWorkstation.xml, using firewall-cmd, the ports 
> > are still accessible by the client and
> > server
> > program.
> 
> Since you say "still", I assume you mean on the Server.  You modified 
> the workstation config file, why would it change anything?
> 
> > Can someone please tell me how to close these ports on Fedora Workstation? 
> > And why does nmap report the ports as filtered on Fedora Workstation and as
> > open/close on Fedora Server?
> 
> What do you mean by closed?  The reason they show up as filtered is 
> because they are blocked on Workstation and not on Server.

I might indeed have accidentally mixed the two up. Everythings works just fine 
now, don't exactly know why though, perhaps a malfunctioning 'systemctl restart
firewalld'? Strange, I almost know for sure that it was the Workstation ports 
that were reported as filtered.

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