On Linux, I prevented remote access to this port using iptables:
# /sbin/iptables -A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 8191 -j ACCEPT
# /sbin/iptables -A INPUT -p tcp -m tcp --dport 8191 -j DROP
# /sbin/service iptables save
The first line allows local access to the port, the second line denies all other access.
... View more