Ubuntu Networking :: Ssh Not Working - Ports Not Open - Tcp Diallow For Lucid
May 7, 2010
I've installed a fresh copy of the latest 10.04 distro, lucid lynx and have problems connecting to the machine via ssh because the ports are all blocked (using nmap to check). In past releases, changing the gdm.conf flag "TCPDISALLOW" from true to false would fix this. In the new /etc/gdm/gdm.schemas, I've tried making a similar change, but it's still not opening things up. I've downloaded gufw and have made sure the firewall is off. So, I'm not sure what to try next.
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Apr 6, 2010
A few months ago I installed Ubuntu 9.10 on my girlfriends laptop, on her request, as she didn't like Windows any more. Since then the internet connection periodically slows down due to too many open ports/connections. Always when this happens I call our ISP and usually there are around 80-200(!) active connections to various IP's.
She is not downloading torrents or anything.
She only uses Firefox and a few open tabs as people do.
Skype is open.
Wireless internet connection.
I am thinking either Ubuntu is updating more or less constantly or the ports/connections aren't closed "after use".
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Apr 5, 2011
I'm trying to open my ports all the way, but for some reason, I am unable to do so. I've forwarded the ports I want open in my router (I switched between two routers to make sure), I made exceptions in Firestarter, and I even added UFW rules, but when I use pretty much any and every port checking tool out there, the ports eithere back stealthed or closed.I'm not a complete noob, and I'm not an expert, but I'm p sure I'm doing everything right, seeing as there isn't much to screw up.The reason I'm trying to fully open these ports is because I'm getting this dumb 'No Incoming Connections
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Feb 4, 2010
Does Ubuntu come with a firewall preinstalled and running? I need to open port 9997 - how would I got about doing this?
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Jan 2, 2011
I have been running Ubuntu 10.10 and have found that at any time I am connected to the Internet that I will randomly see high port numbers open when doing a port scan on my computer all are in the unknown listings with five digit numbers so I don't know what is going on or who is using them. Please check your system to see if you are having the same thing happen by using network tools and filling in your local ip address in the port scan tab. If you shut down your Ethernet interface and run port scans the high ports are no longer open. this will at least keep whoever is using your ports at bay when you are not using the net.
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May 14, 2009
Since there was no response on my other post which i spent about a hour writing, ill go for something simpler. I run this on my server
Code:
# set default policy for the NAT table
iptables -t nat -P PREROUTING ACCEPT
[code]...
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Jan 30, 2010
I would like to open some port from IN to OUT pop3,smtp.whenever i tried to add some rules to existing iptables it gives me an error.Applying iptables firewall rules: iptables-restore: line 21 failed
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Apr 12, 2010
I forwarded ports 28900(TCP/UDP) and 5029(UDP) to my linux box for a game. Testing my ports with a website now shows these ports as "connection refused" rather than "timeout" which means the connections are getting to my system but the iptables are blocking them. But I added 28900 as a test and it still won't accept anything on this port. This is my output of iptables -L
root@BPC3:~# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:28900
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:28900
What do I need to do exactly to add exceptions for 28900 TCP/UDP and 5029 UDP?
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Apr 16, 2010
I need to ensure ports 6112 through 6119 are open. I tried using Firestarter to do this, but when I search for what ports are open, it says none of them are. I use Ubuntu 9.04.
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Aug 19, 2010
I'm trying to set up an SSH connection from my school to my home, but not on port 22. I originally tried port 2222, but it didn't work. I called my school IT people and they said they block that port. I asked if they care if I set up an SSH and they said no, but that they wouldn't tell me which ports are blocked and which are open for "security" reasons (which I guess I can actually understand). They suggested just using port 22 or 222, but said if a ports open I can use it.
My question is, can I check ports without setting up SSH? It seems like a hassle to try a different port every day on my home SSHD file, come to school, see if it works and repeat. Is there a way I can check my computer home for connections that could connect, even if there isn't a service listening? I don't know how to do that, or even if its possible. If not, I suspect I'll just try a few until I find something that works, or just go ahead and use 22.
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Jun 28, 2011
Yesterday I switched from CentOS to Ubuntu, and wanted to install TeamSpeak3 which runs on ports 9987 UDP and 10011 TCP. The TeamSpeak3 worked fine on CentOS before this.
It appears to be running and netstat -an reports:
Code:
udp 0 0 0.0.0.0:9987 0.0.0.0:*
tcp 0 0 0.0.0.0:10011 0.0.0.0:* LISTEN
I believe the only firewall for Ubuntu is "UFW", am I correct? If so, "ufw status" reports:
Code:
Status: inactive
I do have other things running on UDP (Counter Strike Source servers) and people can connect just fine.
When I telnet localhost 10011 I get a response from the TeamSpeak3 server:
Code:
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
TS3
Welcome to the TeamSpeak 3 ServerQuery interface, type "help" for a list of commands and "help <command>" for information on a specific command. However, telnetting from outside just gets no answer, this is what leads me to believe it is a firewall in the way.
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May 4, 2010
Normally I use 'netstat -an' to determine if a daemon is listening on a specific port. The excerpt of this command below doesn't list things like vnc (5900) on ipv4. It does however show it on ipv6. My issue is I want to know how to determine if it is indeed listening on ipv4 as would normally be seen with 0.0.0.0:5900. It would appear that all ipv4 ports are internally being redirected to ipv6. Of course this does simplify things, but it also leaves me unable to reliably determine the ipv4 listening status. How I can tell at a glance if a specific ipv4 port is being listened on? Is there a way to force netstat to list the ipv4 listens specifically?
Code:
art@eee1:/proc/sys/net/ipv6$ netstat -an
Active Internet connections (servers and established) .....
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Apr 20, 2010
How do I open ports 5198/udp and 5199/udp on a slackware based firewall?
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Feb 27, 2011
I had 2 Ethernet ports and neither of them were working on a fresh build a friend was struggling with. After reading the suggestions to fix the issue and thinking that there had to be an easier way I had an epiphany. I would go to my spare parts box and bring out my old Netgear GA311 and pop it into the slot. So after searching for 10 minutes I found it and installed it. Booted up the rig and it found that right away (SWEET) now that's not the fix anybody can do that, once I updated Ubuntu the on-board ports started working (that's what I'm using now). I can't explain what the update did but for a few bucks a used card in the tool box might not be a bad idea!
Mother board is a Gigabyte GAX58A-UD5 Rev.1 Personally I'm an ASUS guy.
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Jul 26, 2011
I set up a vnc connection to my machine the other day and while doing that checked out any open ports.To my astonishment my ftp port is open, although I double checked the firewall and there's no check in the checkbox for the ftp port. I didn't add a "other ports" rule or anything as well.So, how would I be able to fix that?
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Sep 19, 2010
hy my usb ports keep failing ? My optical mouse starts to blink , freezes and then goes off so i try another port and its OK for a while then the same happens again . So i try another until all have been tried so reboot and everything works again. Im not technically minded and have NO idea why this is happening .
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May 8, 2010
I installed Lucid earlier today (took about 4 hours as karmic wouldn't write the cd so had to use wifes Mac OS)
In the 2 previous releases of ubuntu I have had to add irqpoll to the boot line in order for my USB ports to work. I dont understand why this works but it does.
With the new "noninteractive" boot I can't work out how to add irqpoll to the boot sequence.
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Aug 4, 2010
I've installed Sun Java, tomcat6 and tomcat6-admin on 10.04 server 64-bit. By default, tomcat is configured to run as the tomcat6 user. Everything runs just fine on tcp/8080 as initially configured. Modifying the connector port in /etc/tomcat6/server.xml to anything below 1024 (e.g. port 80) results in:
SEVERE: Error starting endpoint
java.net.BindException: Permission denied <null>:80
This all begs the question... do you *really* have to run tomcat as root to bind to a well-known port? I.e. is there really no way for tomcat to start as root, bind to a privileged port and then drop privs?
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May 20, 2010
I had Samba shares (a public folder and a printer) running fine on Jaunty 9.10, when upgraded to 10.04 it stopped working.
I've tried several tips and following different threads to no avail.
when I run smbclient -L localhost or else smbclient -L 127.0.0.1 I get:
Code:
session setup failed: NT_STATUS_NO_SUCH_DOMAIN
when I run smbclient -L TKA I get:
Code:
Connection to TKA failed (Error NT_STATUS_CONNECTION_REFUSED)
Here is my current smb.conf:
[Code]....
I installed samba4 but did't do any difference, so I uninstalled that. Reinstalled SAMBA and the config tool for samba several times. No difference.
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Apr 30, 2010
i'm really frustrated with ubuntu the last little while. i thought things would be better but its hard to stay optimistic when nothing works. My wife's laptop an MSI A6000-029US has an nVidia chipset [MCP79 (rev b1) according to lspci in lucid].i expected the RaLink RT3090 not to work out of box.. but the Ethernet controller for the wired connection doesn't work either.i can't get this thing online to update it. the syslog says:
Code:
Apr 30 04:13:39 msilappy NetworkManager: <info> (eth0): carrier now ON (device state 2)
Apr 30 04:13:39 msilappy NetworkManager: <info> (eth0): device state change: 2 -> 3 (reason 40)
Apr 30 04:13:39 msilappy kernel: [ 402.001626] eth0: link up.
[Code]...
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Dec 6, 2010
Here's the dealy-o. Card is a Netgear, computer says it's a BCM43XG REV01.Card is functional but not working on my fresh Lucid install.Here's what it says:
p { margin-bottom: 0.08in; } derek@derek-laptop:~$ lspcmcia -v
Socket 0 Bridge: [yenta_cardbus] (bus ID: 0000:00:0a.0)
Configuration:state: onready: unknown
[code]...
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Jul 27, 2010
I'm locking down my laptop. I know I can use a firewall to ensure nothing gets through that I didn't catch, and I certainly plan on using one, but in the meantime, I want to know what exactly is running on my system.
nmap localhost returns:
Code:
james@james-linux:~$ nmap localhost
Starting Nmap 5.00 ( http://nmap.org ) at 2010-07-26 23:33 CDT
Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.
Interesting ports on localhost (127.0.0.1):
Not shown: 994 closed ports
PORT STATE SERVICE
25/tcp open smtp
111/tcp open rpcbind
139/tcp open netbios-ssn
445/tcp open microsoft-ds
631/tcp open ipp
2049/tcp open nfs
Nmap done: 1 IP address (1 host up) scanned in 0.18 seconds
However, I know that localhost goes back to the loopback interface, 127.0.0.1. So, to see what was really open, I ran nmap 192.168.0.108, which is my laptop's IP at the moment.
Code:
james@james-linux:~$ nmap 192.168.0.108
Starting Nmap 5.00 ( http://nmap.org ) at 2010-07-26 23:33 CDT
Interesting ports on 192.168.0.108:
Not shown: 996 closed ports
PORT STATE SERVICE
111/tcp open rpcbind
139/tcp open netbios-ssn
445/tcp open microsoft-ds
2049/tcp open nfs
Nmap done: 1 IP address (1 host up) scanned in 0.14 seconds
Now if I understand correctly, I can attribute 139 and 445 to my Samba share. That I'm okay with. What I don't know is 111 and 2049. Does anyone know what these ports are, what's running on them, and how I could turn them off, supposing that they are a security risk?
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Mar 18, 2011
I'm getting heat from the head networking office that ports 21, 110, and 143 are open. I can telnet to those ports from a remote machine (not localhost) and get a prompt. There does not seem to be anything listening on those ports according to netstat. I've tried using iptables to discard all traffic to a from those ports but I can still telnet to them. This is a lucid desktop machine.
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Apr 5, 2010
I'm using ubuntu-linux ( ubuntu 9.10)I use utility autoscan network to scan the systems available in local area network of my hostel.It shows my open TCP ports : like Ssh , Smtp , Http , NetBios-ssn , Microsoft-ds , ipp , Mysql , Postgres.Are all these services need to run all the time or I can manage the ports.Don't know much about it just want to know these ports are by default open or I can manage them.
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May 5, 2010
The problem, I described here [URL] is still active. The final brought no solution...
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May 5, 2010
after having tried out almost all suggestions found here and elsewhere on the internet, i'm somewhat at my wits end The situation: I'm running Kubuntu 32Bit Version (at the mom 10.4) on a HP-Compaq 6735s (AMD Processor, Vanilla 32Bit Install). My first Install was last year with 9.4 and the Broadcom 4322 wireless worked like a charm after installing the proprietary STA-driver under System -> Hardware Drivers. As the update didn't work out really without glitches, i did a fresh install and lost my wireless. I tried various combinations and tutorials but to no avail. My card is found, the driver installed, but i cannot access my access-point. I can SEE the access point (and all my neighbors'), but knetworkmanager does not seem to do anything. To be sure, I installed wicd (nice tool by the way). Trying a connect here told my my credentials were bad (incorrect passphrase for my WPA2 Personal auth), which is not true. I tried connecting without security, didn't get an IP. So it seems somehow the card is working, but all functions needed for passing information to the access-point are unavailable.
This is what I tried:
both broadcom-drivers
fw-cutter
installing the driver by hand
Installing the driver via Hardware Drivers produced the same results as any other, viz the card is working, but not connecting. Unfortunately knetworkmanagers error messages are a bit sparse, or rather non existant. My guess is that somehow the firmware is not properly loaded (or the wrong type??).
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May 7, 2010
I started on ubuntu 8.10 and my wireless card has always worked,Since i did a fresh install of ubuntu 10.04 it still seems to work to a point.I can see networks, click them and use a password to connect but it never seems to carry on, I typed the password correctly and after a minute it asks for it again.I have read a post about problems other people are having and that i need to install a different program.But i cant install another program if there is no wireless as apt-get doesn't work without internet connection.So... I need to download something that will fix it (possible update if one has been released) to xp (partition) then access xp partition from ubuntu and install it.
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May 13, 2010
my 3G card Huawein E630 sucesfully on carmic 9.10. However, after upgrade to lucid 10.04, I cannot connect anymore.After insertion card contains drive containing windows drivers and modem.In karmic both were detected properly, however in lucid only drive is visible and modem is not detected.Connection is setup properly, but network manager does not offer me the connection.
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Jun 7, 2010
I've just completed switching both my laptop and desktop from Ubuntu 10.04 to Kubuntu 10.04, all seems to be working well, except that I can't get my Virgin Mobile HUAWEI E160E wireless broadband modem working. I used to have it working flawlessly in Ubuntu, I've used the smae step as described in this post: [URL] that worked for me with Ubuntu, but the Wireless Broadband tab is greyed out under the manage connections dialog. I'm running the 64-bit version of Kubuntu BTW.
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Jun 17, 2010
I have a broadcom 4318 chipset for my wireless card, but after an upgrade to lucid my system was acting funny. I did a complete reinstall and all the issues are resolved except the wireless card. I would like to get the b43 module working instead of ndiswrapper. How can i do this right in lucid?
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