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telnet for port 5433 is not working while it works for port 22

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Special Forums IP Networking telnet for port 5433 is not working while it works for port 22
# 1  
Old 08-29-2012
telnet for port 5433 is not working while it works for port 22
Hi,

I am trying to set up a dev environment and I have Ubuntu server (10.16.1.92) and a CentOS VM (10.16.3.235) on this. On the CentOS I have a program running on port 5433. Now my problem is that I am unable to telnet this port from another Windows server whereas I can telnet port 22 from Windows.
How can I enable port 5433 to be telnet(ed) from windows?

I am a developer and dont have much knowledge about resolving this issue.

I am giving below o/p of commands from CentOS VM:
Code:
[root@localhost ~]# netstat -apnt
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name  
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1745/sshd               
tcp        0      0 0.0.0.0:5433                0.0.0.0:*                   LISTEN      2354/vertica       
tcp        0      0 :::5433                     :::*                        LISTEN      2354/vertica       

[root@localhost ~]# nmap -v -sV 10.16.3.235 -p 5433
..short o/p..
PORT     STATE SERVICE VERSION
5433/tcp open  pyrrho?

[root@localhost ~]# ss -aln
Recv-Q Send-Q                                   Local Address:Port                                     Peer Address:Port
0      128                                                 :::22                                                 :::*    
0      128                                                  *:22                                                  *:*    
0      128                                                 :::5433                                               :::*    
0      128                                                  *:5433                                                *:*

Thanks,
Rishav
# 2  
Old 08-29-2012
Probably the iptables firewall. You have to add a rule for port 5433 (port 22 is open in the default configuration).

First have a look at the file /etc/sysconfig/iptables
Code:
# 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 -m state --state NEW -m tcp -p tcp --dport 22 -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 19102 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

Now find a nice spot somewhere in between the existing accept rules

Code:
# 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 -m state --state NEW -m tcp -p tcp --dport 22 -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 5433 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 19102 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

Save your changes and restart the firewall:

Code:
service iptables restart

This User Gave Thanks to hergp For This Post:
rishav
# 3  
Old 08-29-2012
Do you have an error message for us to analyse?
# 4  
Old 08-29-2012
thanks @hergp will do the same and post the result.

@RudiC: I am not getting any error in Unix/CentOS side (and my application is also running fine on this box) but when i try to telnet port 5433 on this machine from a Windows box I am getting "Connection Refused" error.
# 5  
Old 08-29-2012
btw, port 22 is ssh - telnet connects on port 23.
I'm surprised you can telnet to port 22 - I'd expect a "connection refused" (or similar) here as well. In your netstat listing you have the program "vertica" listening on port 5433. Are you sure it accepts telnet connections?
Did you try a telnet localhost 5433 on the unix side?
Last edited by RudiC; 08-29-2012 at 01:50 PM..
# 6  
Old 08-30-2012
thanks a ton @hergp adding the lines and restarting the iptables resolved the issue Smilie
@RudiC: now I am able to telnet 5433 from localhost as well as Windows machine.
Thanks a lot guys
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