How to open port 25 in firewall
location: linuxquestions.com - date: March 18, 2003
A newbie question...but I bought a Internet appliance that has RedHat 7.0 Kernal 2.2.16-22 preloaded. The firewall does not allow opening ports 25 or 110 from the Html gui. I can telnet to it and am at bash. What do I do now? I just want this device to allow traffic in/out on these ports as well as 5900 and 1225-26.
Thanks in advance
how to open port 25 for remote machines
- date: January 30, 2003
How to open the 25 port for the remote machine
I run the postfix server for the mail.
from the localhost I can access to the server and when i try the command
nmap , I get port 25 open
but not from the same machine with the network name ( mailiap which is the same machine as locallhost ) here are the outpout
root]# nmap -sT -O webiap
Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Interesting ports on mail.iap.dz (172.19.10.50):
(The 1586 ports scanned but not shown below are in state: closed)
Port State Service
7/tcp open echo
21/tcp open ftp
22/tcp open ssh
23/tcp open telnet here NO 25 port
53/tcp open domain
80/tcp open http
106/tcp open pop3pw
110/tcp open pop-3
143/tcp open imap2
443/tcp open https
515/tcp open printer
873/tcp open rsync
How can I open port 25 with xinetd???
location: linuxquestions.com - date: October 12, 2005
Now i already implement the IPv6 in the RedHat EL. Now wat i want 2 do is open the smtp port for postfix mail server. Is it anybody here can tell me how to open the smtp in the xinetd?? How to configure it in the xinetd???
Open port 25
location: ubuntuforums.com - date: July 5, 2009
hi, i want to setup my mail server for localhost, and i found out that port 25 is closed
i tried nmap, this is the result
nmap -p 25 127.0.0.1
Starting Nmap 4.62 ( http://nmap.org ) at 2009-07-06 03:03 MYT
mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns_servers
Interesting ports on localhost (127.0.0.1):
PORT STATE SERVICE
25/tcp closed smtp
i tried telnet, this is the result
telnet 127.0.0.1 25
telnet: Unable to connect to remote host: Connection refused
and of course that is what to expect if the port is closed,,
so, how do i open port 25 for my localhost?
I havent installed my mail server yet, so is it supposed to be close because no application listen to that port?
I tried iptables:
sudo iptables -A INPUT -p tcp -d 0/0 --dport 25 -j ACCEPT
but then, i use nmap and telnet, it still saying it is closed..
so, how do i open port 25??
How to open port in centOS
location: linuxexchange.com - date: September 26, 2013
I have installed and web application which is running on port 8080 on centOS. I only have command line access (through putty) to that machine. I have tried to access that application from my windows machine from which I am connected through putty, but it is giving connection time out error.
Then I have tried to open port 8080. I have added following entry into the iptables.
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
After adding this into the iptables I have restarted it with -
But still I am not able to access that application from my windows machine.
Can someone please advise am I doing any mistake or missing something.
Thanks a lot in advance.
How to open port 2195 in iptables centos for activating the APNS
location: linuxexchange.com - date: January 1, 1970
I tried this solution:
iptables -I OUTPUT -p tcp --dport 2195 -j ACCEPT
but still can't access the port.
If there are more ports that i have to open for APNS let me know.
Will be happy to get help.
How to open port 21
location: ubuntuforums.com - date: January 3, 2012
I have an ubuntu machine set up.
I have configured an FTP server on this, but can not connect to it from any other FTP client.
I know there is no firewall by default, but I have read that some ports are set to closed by default, so how can I check port 21 is open and change it to open if it is closed. Thank you in advance
iptables how to open port 22 (I guess)
- date: December 3, 2007
I am feeling reasonably clueless about this one .... I am trying to connect to a new server using PuTTY and get SSH Connection Refused. I have been following the The Perfect Server for Gutsy tutorial on howtoforge. I am up to page 3 where it says "From now on you can use an SSH client and connect from your workstation".
Good if it works but for me it does not.
I have installed openssh-server on one machine. Fresh install of Gutsy server and nothing else on the machine.
I am using PuTTY to connect and I get the message Connection Refused.
If I use command line ssh [email protected]
I get more or less the same thing
ssh: connect to host name port 22: Connection refused
Tried from another machine and the same message.
But I can ping the IP and the host name without issue.
So I was asking round and it has been suggested that I need to open port 22 on iptables. If that is the case I do not know how to. Or is there something else I should look at?
I have tried t
Why is my port 25 open?
- date: October 26, 2010
I played around a little and found that out:
:/etc/init.d$ nmap localhost
Starting Nmap 5.00 ( http://nmap.org ) at 2010-10-26 18:19 CEST
Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.
Interesting ports on localhost (127.0.0.1):
Not shown: 998 closed ports
PORT STATE SERVICE
25/tcp open smtp
631/tcp open ipp
Nmap done: 1 IP address (1 host up) scanned in 0.10 seconds
:/etc/init.d$ telnet localhost 25
Connected to localhost.
Escape character is '^]'.
220 alexx-fett ESMTP Postfix (Ubuntu)
221 2.0.0 Bye
Connection closed by foreign host.
Do you know why I have a postfix installed on my system? This is not default, or is it?
On my other laptop (Ubuntu Netbook Remix 10.04) the port 25 is closed.
Thanks in advance,
Port 25/tcp open ?
location: ubuntuforums.com - date: July 5, 2013
I've always seen port 25/tcp open and used by smtp when running nmap on my computer,and I've always assumed it was needed for Thunderbird (please note this is not a server,just a normal desktop pc):later I've realized it is actually used by the service exim4 and that I can stop said service and close that port in the firewall too,and Thunderbird still works.
So the obvious question is,why was that port open and exim4 running? Is that the default for a normal Ubuntu installation?
Anything unusual that I should check?
Lastly,instead of stopping exim4 (although,with port 25 blocked,maybe I shouldn't bother) from a terminal,how can I disable it on boot?
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