I use a Linux license server and have problems accessing the licenses on clients. How can I check if a firewall is causing these problems?

If you are using a Red Hat or related Linux distribution you can switch the firewall off if you log in as superuser (root) and enter the following command

service iptables stop

If serving licenses is now working, the problem was caused by the firewall. If you need to keep the firewall running you will find more information how to do this in the Installation Guide section "Enabling License Communication Across a Firewall or Proxy" and in the Unix man page of iptables, which you can display using the command

man iptables

Keywords: firewall iptables port

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