LinuxQuestions.org - firewalld port forwarding sometimes not working

I have configured firewalld to port forwarding. Below are my config:

Code:

# firewall-cmd --zone=public --list-all

public (default, active)

  interfaces: eth0

  sources:

  services: dhcpv6-client ssh

  ports: 25/tcp 25/udp 26/tcp

  masquerade: yes

  forward-ports: port=26:proto=tcp:toport=8026:toaddr=X.X.X.X

        port=25:proto=tcp:toport=8025:toaddr=X.X.X.X

  icmp-blocks:

  rich rules:

I am testing port forwarding by doing telnet to port 25 in a matter of seconds

telnet X.X.X.X 25 --> ok
after 1 second
telnet X.X.X.X 25 --> ok
after 1 second
telnet X.X.X.X 25 --> ok
after 1 second
telnet X.X.X.X 25 --> not responding
after 60 seconds
telnet X.X.X.X 25 --> ok

So in short it is intermittent. Is there a config settings that causing this behavior? Tried to check /etc/firewalld/firewalld.conf but I did not see any related settings.

Anyone knows if this is the normal behavior of port forwarding of firewalld