Problems restricting Host addresses for incoming connections in JBoss using RemoteHostValve

Issue

• We have activated the restriction for incoming connections in JBoss like is indicated in instructions here, but when we include the FQDN of the machines that we want to allow access, doesn´t work. When we include the IP of the machines, works perfectly. Below is the Configuration, is there another configuration that we have to complete?

[standalone@user-vip1:9920 valve=HostFilter] ls -l
ATTRIBUTE  VALUE                                      TYPE    
class-name org.apache.catalina.valves.RemoteHostValve STRING  
enabled    true                                       BOOLEAN 
module     org.jboss.as.web                           STRING  
param      {"allow" => "hostname.mydomain.com"}    OBJECT  
[standalone@user-vip1:9920 valve=HostFilter]