If you have arno-iptables-script running that blocks everything by default
except what you tell it to open.
The /etc/hosts.deny file probably was set to deny access to everybody.
To get around this carefully, you may wish to open those ports up in
/etc/hosts.allow and only those ports. I think syntax would be something
like:
127.0.0.1:4000
to open up port 4000 for use. You for sure need to have:
127.0.0.1 in /etc/hosts.allow on a line by itself to allow local access
generally. The /etc/hosts.deny and /etc/hosts.allow are part of the
tcpwrappers package.
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