Opening a Custom Port in Fedora 13

[amithad]

Hi,

I was trying to open port 5000 in my fedora 13 server to run a custom application. From firewall I selected the Other ports Option. Then I add the custom port 5000(commplex-main). SE Linux is in enforcing mode.

but when i try to telnet from local machine to the port 5000 I get the following error

telnet localhost 5000
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused

I have already installed telnet-server on the Server because of this error but that did not help

could you help me on this matter please..



N:B inbuilt services like httpd/ssh are working perfectly(can telnet and accessible from outside)

[amithad]

by analysing the issue further I found the following details by typing the iptables -L command and viewing the details of the iptables
-------------------------------------------------------------------------------------------------------------------
iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT icmp -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT udp -- anywhere anywhere state NEW udp dpt:netbios-ns
ACCEPT udp -- anywhere anywhere state NEW udp dpt:netbios-dgm
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:http
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:commplex-main
REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT icmp -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target prot opt source destination
--------------------------------------------------------------------------------------------------------------------------------

# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -i eth0 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 137 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 138 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 5000 -j ACCEPT
-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
-A FORWARD -p icmp -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -i eth0 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

~
"/etc/sysconfig/iptables" 21L, 845C

[amithad]

Hi All,

Finally I found why I was not able to telnet to that particular port 5000. It's a small mistake to telnet you have to run the application first. While the application is running you can telnet to that port if you allow that port from the firewall.

sorry to disturb you all

Thanks

Amitha