Hi,

My server (Linux Redhat) cannot communicate with other servers on port 2059,
what to do taking in account the following Iptables output. Thanks

root@MOOD root]# iptables -L -v -n

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
5485K 4792M RH-Firewall-1-INPUT all -- * * 0.0.0.0/0 0.0.0.0/0

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
0 0 RH-Firewall-1-INPUT all -- * * 0.0.0.0/0 0.0.0.0/0

Chain OUTPUT (policy ACCEPT 4114K packets, 1500M bytes)
pkts bytes target prot opt in out source destination

Chain RH-Firewall-1-INPUT (2 references)
pkts bytes target prot opt in out source destination
451K 619M ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
5034K 4172M ACCEPT all -- eth0 * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 icmp type 255
0 0 ACCEPT esp -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT ah -- * * 0.0.0.0/0 0.0.0.0/0
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:23
0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Are you trying to initiate a connection from outside to your server on port 2059? Or are you trying to connect from server to other computers? If you're trying to connect from other computers, it should be obvious. First of all, what protocol do you want to use? TCP? If you want to accept connections on port 2059 you should simply do this:

iptables -I RH-Firewall-1-INPUT 12 -p tcp --port 2059 -m state --state NEW -j ACCEPT

If you're trying to connect from server to another computers.... .. Maybe that computers aren't configured well..