Sponsored Content
Special Forums IP Networking telnet for port 5433 is not working while it works for port 22 Post 302693441 by hergp on Wednesday 29th of August 2012 08:23:48 AM
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:
 

10 More Discussions You Might Find Interesting

1. IP Networking

block telnet to specific port

Hello All I am running redhat linux 7.2 and would like to know how i can block telnetting to a specified port . say for example i would like to block telnet acesses to port 80. regards Xiamin (5 Replies)
Discussion started by: xiamin
5 Replies

2. Solaris

disabled telnet now need port 23 or port 22

we disabled telnet on solaris 9 via previous a thread. We use CMS (call management system) supervisor which used port 23 (telnet). We cannot use telnet via local directive and it was shut down as stated when we shut down telnet in the inetd file. I cannot now log into the CMS box since port 23 is... (3 Replies)
Discussion started by: panzerkw
3 Replies

3. UNIX for Advanced & Expert Users

telnet on specific port??

Hi all, I have a problem. I have machine names and their IP addresses in /etc/hosts file. My application does telnet on that machine host name. The application does not uses IP address for tenet. It will fetch the host name from /etc/hosts file. Now the telnet server runs on customized port.... (6 Replies)
Discussion started by: zing_foru
6 Replies

4. Shell Programming and Scripting

Telnet IP and Port Script

Hi, I would like to create a simple script that will telnet a number of IP and Ports one after the other to confirm connectivity to those addresses. I don't need to log on, just output to a file what the response is, i.e Escape Character, connectivity refused etc. Complete newbie to... (6 Replies)
Discussion started by: asou
6 Replies

5. AIX

Telnet to port

can some one help me ? what happens when we telnet to a port ? example telnet 192.168.0.xx 1234 where 1234 is a port number Thank you (5 Replies)
Discussion started by: anwesh
5 Replies

6. Windows & DOS: Issues & Discussions

Telnet to a serial port

Hello all. I have an old computer with M$-DOS 7. I want to use it like a dumb terminal, with telnet. I need to connect it to my desktop These are my questions: How can i configure the serial port on dos? How can i telnet form dos to the serial port? How can i set up a telnet server on the... (12 Replies)
Discussion started by: mghis
12 Replies

7. Cybersecurity

Can't telnet to port 25 on the host.

Hi, we have recently setup a new UNIX server with solaris 10 and I am having issue with with SMTP/sendmail. telnet localhost 25 --- works telnet hostname.domain.com 25 -- does not work. # telnet hostname.domain.com 25 Trying 10.122.1.111... telnet: Unable to connect to remote host:... (1 Reply)
Discussion started by: esmgr
1 Replies

8. Red Hat

telnet port 23

My linux version is 2.6.18-194.e14 (Oracle enterprise linux). Could you please tell me how to enable telnet on the server. When I try to connect the server through another pc using telnet it is throwing error. Connecting To <ip address>...Could not open connection to the host, on port 23.... (3 Replies)
Discussion started by: oradba_arun
3 Replies

9. UNIX for Dummies Questions & Answers

telnet echoing 'trying ip' but no port number

Hi, Well this is probably a silly one that I should know...but I don't ! I'm telnetting to various ports from a shell script and the telnet is echoing back that it's 'trying xxx.xx.xx.xx...' but not the port number it's trying! Any help much appreciated Thanks (1 Reply)
Discussion started by: Grueben
1 Replies

10. Solaris

How to find port number wwn of particular port on dual port HBA,?

please find the below o/p for your reference bash-3.00# fcinfo hba-port HBA Port WWN: 21000024ff295a34 OS Device Name: /dev/cfg/c2 Manufacturer: QLogic Corp. Model: 375-3356-02 Firmware Version: 05.03.02 FCode/BIOS Version: BIOS: 2.02; fcode: 2.01;... (3 Replies)
Discussion started by: sb200
3 Replies
FIREWALLD.ZONE(5)						  firewalld.zone						 FIREWALLD.ZONE(5)

NAME
firewalld.zone - firewalld zone configuration files SYNOPSIS
/etc/firewalld/zones/zone.xml /usr/lib/firewalld/zones/zone.xml DESCRIPTION
A firewalld zone configuration file contains the information for a zone. These are the zone description, services, ports, icmp-blocks, masquerade, forward-ports and rich language rules in an XML file format. The file name has to be zone_name.xml where length of zone_name is currently limited to 17 chars. This is the structure of a zone configuration file: <?xml version="1.0" encoding="utf-8"?> <zone [version="versionstring"] [target="ACCEPT|%%REJECT%%|DROP"]> [ <short>short description</short> ] [ <description>description</description> ] [ <interface name="string"/> ] [ <source address="address[/mask]"/> ] [ <service name="string"/> ] [ <port port="portid[-portid]" protocol="tcp|udp"/> ] [ <icmp-block name="string"/> ] [ <masquerade/> ] [ <forward-port port="portid[-portid]" protocol="tcp|udp" [to-port="portid[-portid]"] [to-addr="ipv4address"]/> ] [ <rule [family="ipv4|ipv6"]> [ <source address="address[/mask]" [invert="bool"]/> ] [ <destination address="address[/mask]" [invert="bool"]/> ] [ <service name="string"/> | <port port="portid[-portid]" protocol="tcp|udp"/> | <protocol value="protocol"/> | <icmp-block name="icmptype"/> | <masquerade/> | <forward-port port="portid[-portid]" protocol="tcp|udp" [to-port="portid[-portid]"] [to-addr="address"]/> ] [ <log [prefix="prefixtext"] [level="emerg|alert|crit|err|warn|notice|info|debug"]/> [<limit value="rate/duration"/>] </log> ] [ <audit> [<limit value="rate/duration"/>] </audit> ] [ <accept/> | <reject [type="rejecttype"]/> | <drop/> ] </rule> ] </zone> The config can contain these tags and attributes. Some of them are mandatory, others optional. zone The mandatory zone start and end tag defines the zone. This tag can only be used once in a zone configuration file. There are optional attributes for zones: version="string" To give the zone a version. target="ACCEPT|%%REJECT%%|DROP" Can be used to accept, reject or drop every packet. The ACCEPT target is used in the trusted zone, every packet will be accepted. The %%REJECT%% target is used in the block zone, every packet will be rejected with the default firewalld reject type. The DROP target is used in the drop zone, every packet will be dropped. The default target is {chain}_ZONE_{zone} and will be used if the target is not specified. If other than the default target is used, all settings except interface and source are ignored, because the first rule created in firewall for this zone is 'jump to target'. short Is an optional start and end tag and is used to give a zone a more readable name. description Is an optional start and end tag to have a description for a zone. interface Is an optional empty-element tag and can be used several times. It can be used to bind an interface to a zone. An interface entry has exactly one attribute: name="string" The name of the interface to be bound to the zone. source Is an optional empty-element tag and can be used several times. It can be used to bind a source address or source address range to a zone. A source entry has exactly one attribute: address="address[/mask]" The source to be bound to the zone. The source is either an IP address or a network IP address with a mask for IPv4 or IPv6. The network family (IPv4/IPv6) will be automatically discovered. For IPv4, the mask can be a network mask or a plain number. For IPv6 the mask is a plain number. The use of host names is not supported. service Is an optional empty-element tag and can be used several times to have more than one service entry enabled. A service entry has exactly one attribute: name="string" The name of the service to be enabled. To get a list of valid service names firewall-cmd --list=services can be used. port Is an optional empty-element tag and can be used several times to have more than one port entry. All attributes of a port entry are mandatory: port="portid[-portid]" The port can either be a single port number portid or a port range portid-portid. protocol="tcp|udp" The protocol can either be tcp or udp. icmp-block Is an optional empty-element tag and can be used several times to have more than one icmp-block entry. Each icmp-block tag has exactly one mandatory attribute: name="string" The name of the Internet Control Message Protocol (ICMP) type to be blocked. To get a list of valid ICMP types firewall-cmd --list=icmptypes can be used. masquerade Is an optional empty-element tag. It can be used only once in a zone configuration and is not usable for IPv6. If it's present masquerading is enabled for the zone. If you want to enable masquerading, you should enable it in the zone bound to the external interface. forward-port Is an optional empty-element tag and can be used several times to have more than one port or packet forward entry. This is for IPv4 only. Use rich language rules for IPv6. There are mandatory and also optional attributes for forward ports: Mandatory attributes: The local port and protocol to be forwarded. port="portid[-portid]" The port can either be a single port number portid or a port range portid-portid. protocol="tcp|udp" The protocol can either be tcp or udp. Optional attributes: The destination of the forward. For local forwarding add to-port only. For remote forwarding add to-addr and use to-port optionally if the destination port on the destination machine should be different. to-port="portid[-portid]" The destination port or port range to forward to. If omitted, the value of the port= attribute will be used altogether with the to-addr attribute. to-addr="address" The destination IPv4 IP address. rule Is an optional element tag and can be used several times to have more than one rich language rule entry. The general rule structure: <rule [family="ipv4|ipv6"]/> [ <source address="address[/mask]" [invert="bool"]/> ] [ <destination address="address[/mask]" [invert="bool"]/> ] [ <service name="string"/> | <port port="portid[-portid]" protocol="tcp|udp"/> | <protocol value="protocol"/> | <icmp-block name="icmptype"/> | <masquerade/> | <forward-port port="portid[-portid]" protocol="tcp|udp" [to-port="portid[-portid]"] [to-addr="address"]/> ] [ <log [prefix="prefixtext"] [level="emerg|alert|crit|err|warn|notice|info|debug"]/> [<limit value="rate/duration"/>] </log> ] [ <audit> [<limit value="rate/duration"/>] </audit> ] [ <accept/> | <reject [type="rejecttype"]/> | <drop/> ] </rule> Rule structure for source black or white listing: <rule [family="ipv4|ipv6"]/> <source address="address[/mask]" [family="bool"]/> [ <log [prefix="prefixtext"] [level="emerg|alert|crit|err|warn|notice|info|debug"]/> [<limit value="rate/duration"/>] </log> ] [ <audit> [<limit value="rate/duration"/>] </audit> ] <accept/> | <reject [type="rejecttype"]/> | <drop/> </rule> For a full description on rich language rules, please have a look at firewalld.richlanguage(5). SEE ALSO
firewall-applet(1), firewalld(1), firewall-cmd(1), firewall-config(1), firewalld.conf(5), firewalld.direct(5), firewalld.icmptype(5), firewalld.lockdown-whitelist(5), firewall-offline-cmd(1), firewalld.richlanguage(5), firewalld.service(5), firewalld.zone(5), firewalld.zones(5) NOTES
firewalld home page at fedorahosted.org: http://fedorahosted.org/firewalld/ More documentation with examples: http://fedoraproject.org/wiki/FirewallD AUTHORS
Thomas Woerner <twoerner@redhat.com> Developer Jiri Popelka <jpopelka@redhat.com> Developer firewalld 0.3.9 FIREWALLD.ZONE(5)
All times are GMT -4. The time now is 09:27 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy