General :: Unable To Close SSHD On IPv6 TCP Port?
Aug 23, 2011
I'm running Ubuntu 10.4 and I've tried disabling IPv6 as I don't currently need it. I rand the following to disable IPv6 and then rebooted my server:
echo "#disable ipv6" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
After the reboot I can see that IPv& is disabled by running:
cat /proc/sys/net/ipv6/conf/all/disable_ipv6
On running netstat -antlp i see that most of the IPv6 applications have closed but SSHd keeps running:
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:9090 0.0.0.0:* LISTEN 663/java
[Code]....
Ho can I close the SSH daemon on port 22 of the IPv6?
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Jul 7, 2010
I know that ports are, by default, not filtered; they simply don't respond to requests if there are no services listening on the port. Well, running netstat -tulpn gives:
Code:
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -
[code]....
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Jul 7, 2011
I am using Fedora 13 64bit. My eclipse program starts a server on port 9050 but I shutdown the program, eclipse fails to properly shutdown the server. Restarting eclipse has no effect.
How can I close or unbind a port forcibly from command line?
I know rebooting or log off and back on will clear the ports but this much slower process for me. I am looking for forcibly closing the port in command line.
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Oct 5, 2010
In centos 5.3 i am unable to start sshd service shows error starting sshd :/etc/init.d/sshd:line102"7182 illegal instruction $sshd$ option
Same error while starting the httpd service.
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Feb 5, 2011
I just upgraded from FC 13 to FC 14. I run an ssh server on a port in the 3000s (call it 3xxx, to protect the innocent). When I try to start sshd with the "Port 3xxx" option in sshd_conf, I get the following error in /var/log/secure
sshd[5104]: error: Bind to port 3xxx on 0.0.0.0 failed: Permission denied.
sshd[5104]: error: Bind to port 3xxx on : : failed: Permission denied.
I did not use to have this problem in FC 13. how I can give sshd the necessary permissions now?
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Feb 19, 2010
A command like (single quotes used in the command):
Code:
ssh -L '[::1]:3128:127.0.0.1:3128' ...
is getting an error message like:
channel_setup_fwd_listener: getaddrinfo(::1): Address family for hostname not supported
This is supposed to be an IP address, not a hostname, for the localhost in IPv6. Anyone know what is wrong with this? Addresses like this work OK in rsync. I know I can use ip6-localhost as a hostname. But right now I'm testing actual IP addresses in IPv6 to see what programs can or cannot handle it.
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Oct 16, 2009
Jst to tryout ufw I tried to close port 80 on my pc. I'm using Ubunutu 9.04. I sudo ufw enable sudo ufw deny 80. But nmap localhost shows port 80 open why? How can I close it? I will need to control some ports on my next server.
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Apr 6, 2010
A netmap scan of my WAN IP address (cable modem) shows;
23/tcp open telnet?
8080/tcp open tcpwrapped
I've called Linksys and Netgear and they have said there is no user adjustable configuration allowed for the Cable Modems.
How am I supposed to close the open ports if the manufacturer doesn't allow access ?
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Mar 7, 2010
I have openSSH installed and wish to log on to my Centos container (hosted by switchlinck.co.uk) from my Windows PC using putty. I can log on fine using by entering my username and password, but wish to use an rsa key to log on without a password. I have managed to create the keys with putty, and ammended them to work with openSSH. However, I am unable to find the authorized_keys file to put the key into. SSH is running but that file does not exist in /etc/ssh. When I read different how to sites for this, they all point towards ~/.ssh. I do not have a .ssh directory anywhere on the system. I have tried creating different users but still can not find this directory.
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Jan 17, 2016
I scanned my newly installed Debian 8 and found that i have two ports open.
22 for ssh which i want
111 can i safely close port 111 and how?
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Dec 19, 2010
I've recently been taking a look at my router settings and I've realized i have my vnc port open for some reason. I don't know how or why it got opened because I've only used vnc within my private lan. Anyway, the problem is I couldn't figure out how to close that port on my router, so I just uninstalled all the vnc software from my computer so it wouldn't act like a vnc server for anybody trying to access it from the outside. So, effectively, I cannot vnc into my computer from outside my private lan, but when i port scan my public ip, the vnc port still appears open.
I'm wondering if there's something i'm missing. I'm sure it must be something in the router that I haven't figured out... something that's keeping port 5900 open.
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Mar 12, 2011
I would like to Close/Open port 21 using command line. I have an FTP server and I don't want to have the port open all the time. I need only two hours by week to be open port 21 from outside to inside.So I need to know the command line for opening and closing the port 21 then I will implement this in a script into cron.hourly.
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May 17, 2010
I downloaded IPKungFu which is supposed to do this for me, except it did not according to a penetration site. configure IPKungFu perfectly. I did look at this site. IPKungFu easy iptables based server firewall - zarzax the blog I downloaded IPKungFu which is supposed to do this for me, except it did not according to a penetration site. Help me configure IPKungFu perfectly. I did look at this site. IPKungFu easy iptables based server firewall - zarzax the blog
Results
rv @rv-laptop:~$ sudo ipkungfu
Checking integrity: ..PASSED
Checking MD5 Hash of config files:OK
[code]....
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Mar 28, 2010
I'm not that great with mailservers, and just been thrown a curveball with a MS Exchange environment for which there is apparently no solution... yeah, right. But is there a workaround?
The problem is that the site mail (SMTP) needs to be sent via port 26 instead of the commonly used 25. Port 25 is mapped to a mailfilter, which apparently causes havoc with some of the mail, and the techs that have been on site trying to coax the Exchange server to co-operate have said that the only way would be to get rid of the filter.
The problem is that there are number of apps that are unable to have the outgoing port changed and so keep sending mail out on port 25.
I look after the Unix/Linux side of things at work, and I was wondering if there was an easy way to set up a Ubuntu box to receive mail on port 25 and just forward it to the MS box on port 26? So, in other words (and I hope this makes sense): monitor port 25, and forward whatever comes in on port 25 to the server on port 26. Simple portforwarding, or is it? What steps do I need to take?
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Jul 21, 2010
Hey even I'm not able to telnet to IPv6 address on port 23
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Jul 22, 2009
I used to play with gw6c ( a client for tunnel broker ) It works well with fedora9 , fedora 10, but not with leonidas. my rpm is gw6c-6.0-0.4.beta4.fc9.i386.rpm ( a little old!) when I tried to install i have got this: libcrypto.so.7 est ncessaire pou w6c-6.0-0.4.beta4.fc9.i386 I try to make a soft link to libcrypto.so.0.9.8k, but nothing; The question :-Is there a solution for that pb - did you know a better client for non native ipv6 connectivity?
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Aug 31, 2011
I have been struggling to get FC15 to act as an IPv6 router for a while now, am sure I am missing something trivial.. The idea is that I have a ppp / adsl connection (this works fine), use the wireless card on my pc with hostapd and dhcpd to provide connections to other pcs (works fine), and radvd to delegate ipv6 addresses.
The issue seem to be that as soon as I turn on ipv6 forwarding (net.ipv6.conf.all.forwarding =1), the ppp connection no longer gets an IPv6 address. This means the router cannot ping any ipv6 address outside my network.
If I disable ipv6 routing, my router gets an IPv6 address on its ppp connection, and can ping things such as ipv6.google.com just fine, however (of course) no packets are forwarded from my network and radvd complains that forwarding is disabled.
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Feb 4, 2011
I am able to retrieve IPv4 addresses with ioctl. But it is not returning IPv6 addresses. My requirement is to get both IPv4 and IPv6 addresses. I can not use getifaddrs() since it has to be common code between linux, solaris and aix. Solaris and AIX are not having getifaddrs(). Following code is returning only IPv4 addresses.
Code:
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
[Code]....
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Jan 22, 2011
So this is my first post so I'll put it in "Newbie".I seem to have successfully configged my httpd.conf file to listen on port 8008. I restarted httpd ok. However, when I go to port 8008 in a web browser from another computer on the internal network by going to 192.168.2.5:8008, it doesn't connect. When listening on port 80, I can browse to the IP address fine. is this a server-side or client-side issue? Using Fedora 12. Thanks in advance and tell me what forum this would best fit in.
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Feb 22, 2011
Say I have Computer A behind a router with NAT. I'm unable to add any port forwarding rules to that router. Then I have Computer B with a public IP address that I want to forward X windows from. This computer is headless, but does have a video card so X windows can be used. Here are some of the things I'd perform to setup my scenario.
1. Computer B, I'd run xhost + public_ip of NAT router.
2. Make sure that computer B's sshd service has X11 forwarding enabled.
3. SSH from Computer A to Computer B with the X windows forward option.
4. Once in Computer B, set the DISPLAY env variable to the public_ip of NAT router.
5. On Computer B run xclock.
At this point I'd expect to see an instance of xclock originating from Computer B onto my desktop. However this obviously won't work. The problem is that when the request is made to Computer B to forward the instance of xclock to Computer A the forwarded instance of xclock will get stuck at the NAT router. Without a port forwarding rule the NAT router will not know which internal IP to route the instance of xclock.
Here's my question. Is there any way for Computer A to initiate a connection to Computer B and then forward the instance of xclock? That way if it uses that same connection the NAT router will know which internal IP to route it to because it would be an active connection in the router's routing table. Or is there an alternative? Of course I can vnc into another computer outside the NAT network and then forward an X window to it just fine. But in the spirit of expanding my knowledge on X windows I'd like to see what is possible.
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May 19, 2011
Startup script. I have a problem with an error on system boot:
hub 2-0:1.0:unable to enumerate usb device on port 5
This error is continuous, filling up my system logs. It is also a known kernel bug. I found a solution here: [URL] but it is only good after I boot. I have tried to make a startup script in /etc/init.d in the following manner.
sudo mkdir /opt/usb/
sudo gedit /opt/usb/usbproblem.sh
#!/bin/bash
# chkconfig: 345 91 19
# description: stop usb problem on startup
case $1 in
*)
echo "fixing usb problem"
cd /sys/bus/pci/drivers/ehci_hcd
sh -c 'find ./ -name "2-0:1.0" -print| sed "s/.///">unbind'
cd ~
esac
exit 0
#End of boot script
##
sudo cp /opt/usb/usbproblem.sh /etc/init.d
cd /etc/init.d
sudo chmod +x usbproblem.sh
sudo update-rc.d usbproblem.sh defaults 92 20
but it does not work.
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Jul 2, 2010
Iam using snmp to access the remote system data.But according to the requirement iam encoding the snmp request data to OAMPDU packet format and sending to remote system.the remote system receives the OAMPDU packet,decodes it and is sending the snmp packet to snmp agent through UDP socket which is bind to port 161.but iam unable to receive the response from snmp agent.i have created a udp socket which is bind to 161 port to receive the response.
if i use any other free port number other than 161 for receiving snmp agent is not sending the response to that port.can any one please suggest me how to overcome this problem.Can we configure the different ports for tx,rx ?How do we know on which port does snmp sends the response ???
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Feb 27, 2011
Running: Ubuntu 10.10
I'm in a bind and I don't know how to get what I want. Nmap shows ipp running cups on port 631. Great, simple enough I uninstall cups, along with its dependencies. A new portscan reveals that the port is closed SUCCESS, but... Ubuntu Update Manager nags me @ every restart about the "important security" updates. I can't lock the version of cups in Synaptic, because cups is not installed! So you see I'm in a bind. If I have cups installed I have an open port, and if I uninstall cups the update manager nags me. What do I do? I've tried:
- stopping the cups service and issuing the chkconfig cups off command... (doesn't close the port)
- uninstalling cups... (update manager nags)
- fuser -k 631/tcp (great, but @ reboot the port is still open)
Please teach me how to close this port / stop this service / tell update manager to shove cups.....
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Apr 3, 2010
I am trying to copy the file on remote server, but I am getting error " ssh: connect to host 172.28.21.14 port 22: Connection timed outlost connection "My two server are bastion10 and newlink, I want to copy file from newlink to bastion10 buet unable. I am able to ping, when i run " lsof -i :22 " command on link3new server I am getting
link3-new:lsof -i :22
sshd 6992 root 4u IPv6 11878 TCP *:ssh (LISTEN)
while on bation10 it is ( ESTABLISHED ) ..
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May 26, 2011
I recently installed ubuntu 10.10 replacing fedora 10. installation was successful but when I start Ubuntu, computer halts showing two line error [18.929065]mpu401_uart:unable to grab port 0x330 size 2 [18.929125]cmipci: no UART401 device at 0x330 Even reinstalling could not solve problem If this is related to audio then in Fedora 10 everything was working fine. But I could start Ubuntu selecting recovery mode with option 'single' then from recovery menu 'boot as normal', providing username and password and typing 'startx'. How can fix this error?
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Jun 16, 2011
I create SCTP socket with port number 60011. The SCTP socket descriptor value is 18.
When I try to close the socket with the socket descriptor, sometimes it is not closed without errno.
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Jun 11, 2011
I was using Compiz, and was going to check out the 3DBox add on. I clicked it, enabled it, and then my windows vanished. I rebooted. Then, when I came back, all my windows open now in the top left of the screen, and the close, minimize and maximize icons are gone. I cannot even see the top bar of a window to move it.
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May 17, 2011
How to separate sftp and ssh and run on different ports.
i.e.
a) sftp on port x
b) ssh on port 22
I searched from the web and there are no detailed instructions. They suggested something like separating sshd_config into two files (file A and file B) and run two instances. Each instance points to its configuration file.
However, they didnt write down the detailed procedure of:
a) how to modify file A and file B (i.e. which line should insert specific commands)?
b) how to run two instances?
c) how to point each instance to its config file.
I am using Linux CentOS and the latest open-ssh.
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Oct 14, 2010
I have just built my first ever Linux desktop, using VM Ware and it is running Ubuntu 10.10. I wish to try and use SSH to contact the machine but I don't believe the SSHD is running.
I have done a grep for SSHD shows nothing and have checked the Synaptic Package Manager and can see an openssh-client version 1:5.5.p1-4ubuntu is currently installed.
On Solaris, you can start SSH by typing /etc/init.d/ssh start but when checking /etc/init.d on Linux, there is nothing in there called SSH so am unable to restart it.
I just want to have the SSH running on the machine.
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May 27, 2010
When I signed up for my Debian Linux VPS hosting and first logged on and invoked ps, there was the only user process running: sshd. As I can see, this was minimal Linux with only two things installed and configured: sshd and apt (plus all dependencies, of course).
I want to build (or use existing) similar Linux distro, any advice on how to build (or pick) one? Googling "minimum linux", or "linux with sshd only" usually brings up Debian's netinstall, which is not what I want.
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