To add accept rules for the other chains you would put in lines similar to the input rules.
-A INPUT -p tcp --dport 20900 -j ACCEPT
-A OUTPUT -p tcp --dport 20900 -j ACCEPT
-A FORWARD -p tcp --dport 20900 -j ACCEPT
If the firewall is doing NAT this gets more complicated.
Can you post your firewall script?
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