Ubuntu :: Using ISP's That Block Incoming Connections?

Apr 4, 2010

I need some suggestions on software. I would like to offer remote desktop support to some of our clients, but some of them are using ISP's that block incoming connections so, VNC is out of the question. I was wondering if there is something similar to logmein for ubuntu?

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Ubuntu Networking :: Firewall - Block Incoming / Outgoing Connections To IP Range

Jul 4, 2010

I am still new to ubuntu and I use firestarter as my firewall tool and I was told that its just ufw in a gui. Well anyways I noticed a connection to using https and python, I didn't have any scripts running and my browser was closed, I read the man files for ufw and it said to do something like deny from and I want to block all incoming and outgoing connections to this IP range and I was wondering how to do that, I heard of iptables that it would be able to do this but I dont know anything about it. What I should learn so I can handle these kinds of situation in the future and how I can block this ip subnet or also what does the /8, /12, and /16 stand for?

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Security :: Incoming Connections On 445?

Apr 11, 2010

Its been really bugging me that whenever I scan my connection with wireshark I see this one person sending me a SYN packet every minute on port 445. I know this is the dangerous port that the Conficker worm travels along. So far my computer seems to be immune and I know, at least on the Linux side that I can just add a rule to my ip tables to block that port indefinitely. I want to know what the next step is.

00 0c 41 b2 e4 1d 00 11 09 b2 2f 0e 08 00 45 00
00 30 91 84 40 00 80 06 d1 c7 46 4f 86 29 XX XX
XX XX 10 43 01 bd 9e 23 d6 27 00 00 00 00 70 02
ff ff 65 58 00 00 02 04 05 b4 01 01 04 02

This is one of the packet captures I am getting. After sending me this and getting no reply, all of a sudden he goes up an ip. Basically this would be the pseudocode for what it looks like hes doing on my end.

for(int i = 1; i != 255; i++){
send_connection_attempt("XX.XX.XX." + i);

To me this looks like this guy has hijacked a computer and is using it to run a script over. He is still scanning my network as I said earlier, what should I do? Should I contact my ISP? or just nail down the hatches and make sure nothing is exposed on my network?

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Ubuntu :: Allowing Incoming Connections On Port 22 From Anywhere?

Jul 19, 2011

I'm trying to get VNC working but I'm getting this error message:


ssh: connect to host my_ip_address port 22: Connection refused

When typing:


ssh -f -L 5900:localhost:5900 user@my_ip_address x11vnc -safer -localhost -nopw -once -display :0 && sleep 5 && vncviewer localhost:0

I'm trying to follow the instructions here: [URL] but I'm struggling with point 2 & 3:


2. If you have previously reconfigured the firewall on your PC, make sure the firewall allows incoming connections on port 22 from anywhere, and on port 5900 from localhost (also known as

3. If your PC is behind a home router, or any other device that uses NAT, configure your router to send connection attempts on port 22 (but not port 5900) to your PC

So my questions are:

1. I installed a fresh version of Ubuntu 11.4, should I be concerned about step 2? If so, how can I allow incoming connections on port 22 from anywhere, and on port 5900 from localhost?

2. Regarding step 3, I'm using NETGEAR model DGN1000 router. Is that something that I should do from the router's setting page or it's some commands that I should pass through SSH?

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Ubuntu Security :: Block Incoming URL In 8.10?

Jun 17, 2010

I'm trying to block an incoming URL. My ISP is hijacking 404 pages and annoyingly changing the URL line in the browser and flashing all sorts of popup ads. I just need it for incoming URLs which my router doesn't seem to handle. I'd prefer something packaged with Ubuntu 8.04, but anything simple will do. I know in KDE I could edit the kdeglobals file with:

[KDE URL Restrictions]

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Ubuntu Networking :: No Incoming Connections When Firewalls Disabled?

Mar 13, 2010

I'm using Linux Mint 8 KDE, which is essentially kubuntu karmic.

Been trying to set up bittorrent (tried several different apps), have followed all the usual steps, forwarded ports on both Guarddog and my router, but still no incoming connections. Then tried disabling the firewall in Guarddog - still no incoming connections. Never had any problems configuring my router before so can only think that there must be something else blocking ports in linux other than iptables.Also had same problem just using ufw and gufw

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Fedora :: Incoming Connections Are Not Being Reported To Var/log/secure?

Oct 24, 2009

incoming connections are not being reported to my /var/log/secure. I can't see if people are trying to connect. I can't troubleshoot because I can't do anything.

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Red Hat :: Allow 100 Incoming Connections To Server Running Smtp?

Feb 24, 2010

I want to allow 100 incoming connections to my linux server running smtp. I know that tcpserver -c will set the limit of allowed incoming connections, but how can I tell what the currently set limit is?

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Networking :: Ubuntu Server Does Not Accept Incoming Network Connections Like SSH?

Feb 25, 2011

I have a bunch of Ubuntu boxes on one subnet, I have a Windows 7 box on another subnet, I am able to ping and SSH to all servers on the .1 subnet except for one server, which I will call PITA. I will attempt to SSH to PITA, and it won't respond, nor does it respond to pings. I will the SSH to PITA from another of the test servers, successfully connect, and then when I SSH from my Windows 7 machine I can connect successfully. If I first connect via console to PITA and send some pings out (to anywhere, like, I can also connect from my Windows 7 machine. I've never seen anything like this.

One of the weird things is that I used PITA to create an image that I then used to create many of the other test servers, and they work fine, so I'm not sure what the problem is. I've checked /var/log/messages and syslog and there's nothing in them that indicates a problem. I've rebooted this server, restarted SSH, changed the IP in case it was conflicting with something else, forced an ARP update in case it was cached (since I had bonded the interfaces), cleared the ARP cache on my own machine, verified Network Manager is not installed...and I still have this issue.

Here are some network-related config:



# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface


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OpenSUSE Network :: Monitoring Incoming And Outgoing Connections?

May 19, 2010

My question is simple - is there any linux app or applet which is able to show (monitor) incoming and outgoing connections assuming it's a direct internet access? I was using a firewall on a system off Redmont which was able to show every connection, listening ports of services if some were opened etc.

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Ubuntu Networking :: Bridging Firewall - How To Block Incoming Traffic

May 2, 2010

I have a ubuntu computer set up as bridge between gateway and lan, with the lan connected to eth0 and gateway on eth1.

I'm trying to get it to basically block everything incoming except for the ports i specify, but also allow outgoing traffic. I've found, tried, modified som examples i found on the web, but still it wont block incoming traffic (ie, im still able to reach my webserver)

These are the rules, and i can't figure out why it wont block:

iptables -F
iptables -X
iptables -I INPUT -i eth1 -j DROP


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Ubuntu Servers :: Firestarter Doesn't Allow Anyway To Block Incoming Connection By IP

Sep 19, 2010

What is the absolute quickest or easiest way to block an incoming connection by their IP address? I'm running an apache2 LAMP server on Ubuntu 8.10. For example, let's say I'm watching my server error logs and I see someone using a script to check for phpmyadmin and other such folders. Right away I know this is a hack attempt. Firestarter does not allow ANY way to block an incoming connection by IP (to my disappointment) and adding the IP to an apache configuration file requires an apache restart (way too much trouble and time).

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Ubuntu Networking :: Iptables: Block Incoming And Allow Outgoing Traffic

Jan 6, 2011

I need to configure iptables to block incoming traffic (except specific ports), but allows all outgoing traffic.

I am able to block incoming traffic, but doing so also prevents outgoing traffic (tested by telnet [URL] 80)

The following was used:

iptables -A INPUT -p tcp --dport ssh -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -I INPUT 1 -i lo -j ACCEPT
iptables -A INPUT -j DROP

Also, even allowing NOT SYN requests still prevents outgoing traffic.

iptables -I INPUT 1 -p tcp ! --syn -j ACCEPT

Another point:

# modinfo ipt_state
modinfo: could not open /lib/modules/2.6.18-028stab070.14/modules.dep

How to install ipt_state module on ubuntu?

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Networking :: Block All Incoming Mail Traffic Except Certain Addresses?

Jan 12, 2009

assist me in using the iptables firewall to block all incoming mail traffic (SMTP port 25) except that of a certain IP(s)? the situation is that we have a server that we only want to receive mail from a particular sender.

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Security :: Iptables State Module - Configuration Error / Not Enable Incoming Packets From Connections Initiated From Inside?

Mar 30, 2011

I have a server that I can only access via SSH (it's located far away) and I would like to secure it by blocking all ports except the ones that I need (which are HTTP and SSH). I still want to be able to make outgoing connections to enable software updates and other things.This is my iptables -L -n :

Chain INPUT (policy ACCEPT)
target prot opt source destination
DROP tcp -- tcp dpts:1:21
DROP tcp -- tcp dpts:23:79
DROP tcp -- tcp dpts:81:65535

In my opinion, this should block all incoming packets except the ones on port 80 and 22, but allow responses to outgoing connections. But a wget http://google.com does not work, it can't establish the connection.

Maybe this is not the best style for iptables rules, but I want to be absolutely sure to not accidently lock myself out from SSH, so I chose not to configure a "block-everything rule".

Does this configuration not enable incoming packets from connections initiated from inside?

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Security :: Block Ips With Lot Of Connections?

Oct 31, 2010

on my linux server i have many websites but with difrent ips address, is some way to i can block all the ips with many connection (100+) just from my website not from all websites

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Ubuntu Security :: Firewall Does Not Block Tor Connections

Oct 2, 2010

I have noticed interesting problem. I use two browsers - Firefox and Konqueror. Konqueror is configured to use tor, Firefox not. Using Gufw I block all incoming and outgoing traffic and it works while using Firefox, I mean that I can't view any www site and it is ok. But if I use Konqueror I can establish any conection. How to understand this? Should I have different firewall while using tor?

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Server :: IP Blocking - Block ALL Connections Except For Certain Ones

Feb 8, 2011

Ok so, buddy of mine has his ssh server setup and upon checking his logs he sees a ton of failed attempts. Now obviously these are people that are scanning him and trying to brute force him. So is there a way to block them? We know you can block each IP but is there a way to block ALL connections except for certain ones, such as his and mine? Maybe a couple others.

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Ubuntu :: Terminal Command To Block All Internet Connections?

Apr 16, 2011

I am trying to write a shell script that will block any outgoing Internet connection, focusing mainly on the HTTP connections.

It would be nice if this command could work on both Mac OSX and Linux.

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Server :: Block Connections To Apache If Client Doesn't Have Valid Request Headers?

Feb 8, 2011

My server gets ddos attacks. I dig into access logs and I saw that attacker ips doesn't have valid requests headers, like their browser application info or requested url info.I want to close those connections immediately, and if it's possible block those ips for a time period.Can I do that with Apache and iptables?I searched on the internet but couldn't find useful results. Probably couldn't search for the right words.

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Ubuntu :: 2 Pptp Vpn Connections - When I Dial One Of My Vpn Connections, My Other Vpn Connections Be Disabled?

Feb 7, 2011

have a problem with my network-manager in ubuntu 10.10.when I dial one of my vpn connections, my other vpn connections be disabled and I can't use them!I tried to restart network-manager and gnome-panel, but it does't seem to solve this problem.

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Security :: Policy That Limits Connections On Port - Encapsulates Total Sum Of All Connections From Hosts?

Jan 21, 2011

Is it fair to say that connLimit and hashlimit are very similiar on Linux i.e. while hashlimit caters to limits for groups of ports, they both set the connection rate limit per host? How in IPTables, do I configure a policy that limits connections on a port that encapsulates the total sum of all connections from all hosts? i.e. I do not want to allow more than 6000conn/minute for port range that is the sum of all connecting hosts?

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Fedora Installation :: Network Connections Is Inactive - Cannot Set Internet Connections

May 30, 2011

I recently installed Fedora 15 now, and during installation I set the internet connection manually, then did update and after reboot, the internet connection settings have been removed. Now I can not set because the network connection to the Internet Connection is inactive. I mention that before the update was functional internet connection.

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Ubuntu :: No Incoming Packets With Ekiga?

Nov 2, 2010

I am using a NanoStation 2 in Router mode.The NS is connected wirelessly to my neighbor's router and a switch is connect via ethernet to the NS for LAN use.

The past few days I'm trying to use a VoIP client software to connect to my VoIP account.I use Ekiga Softphone to do so, which requires UDP ports 3478-3479 and 5000-5100 to be open.

So I have opened these ports both on my neighbor's router and on the NS.The problem that I'm encountering is that although I manage to register to the VoIP service, when I answer an incoming call the caller is able to hear me, but I'm not able to hear the caller.So I used wireshark and figured that there is no incoming traffic on my end.

I have used many linux VoIP clients with PCs connecting straight forward to an ADSL router and worked perfectly.

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Ubuntu :: Mail Not Incoming From External?

Mar 4, 2011

I am setting up a server that is to serve websites and host mail.I have run into a problem regarding the mail server. The server is completely set up but for some reason it is not receiving the e-mails I am trying to send to it. When i mail to the associated mail address from internal by the "mail" command it works fine. But when I try from an external mail server, the mail never gets through. And I do not receive a bounce e-mail.

It says that the port 25 IS open for TCP connections (in iptables - I opened it myself). And surely when I telnet to it on that port from inside the server, I get an connection. But when I telnet from an external network I get a refused connection. It would sound that the port is in fact not really open for external use, in my mind, but it is. Is there possibly anything else I might have neglected to check in this mystery

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Ubuntu :: Can't See Incoming Video On Skype / Show That?

Feb 4, 2010

I can not see incoming video on Skype.

Okay, so I have Skype installed, and it has worked fine in the past. I have been able to chat with my girlfriend on it. We can see each other and both talk. I haven't used it in probably 3 or 4 months. I tried to use it last night and for some reason, I could not see her on the video. It would just show up as a white box where the video should be. She could see me, and we could hear each other. I already had her test with somebody else to check if her video output was okay, and it worked just fine.

I read something that Cairo Dock could somehow be affecting it, but I haven't tested this theory. I can't see how the two could be related.

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Ubuntu :: Ekiga Does Not Accept Incoming Calls?

May 14, 2010

After I installed Lucid on my Netbook, I have different problems with ekiga.

First of all, some information about my ekiga account:

In ekiga I created a SIP-Account with a usual landline phone-number, my voip-provider is 1&1 (in Germany). In ekiga the account is named "Standard%limit", because I cannot register my sip-account without the "%limit". If I leave the "%limit" out, I get the message "Could not register (Forbidden)", but here on ubuntuforums (or maybe on launchpad) I read about the "%limit" as a workaround. Maybe it has something to do with my problem, I don't know.

Now, this is my problem:

Ekiga does not accept incoming phone calls after a few minutes after launching ekiga. Well, let me describe it this way: Usually ekiga plays a ringtone and shows a message whenever there is an incoming call. However, ekiga only behaves as described and expected just after launching ekiga. A few minutes later, lets say five or ten minutes, ekiga does not accept incoming calls anymore. I tested it with my mobile phone - when I call myself on the landline with my mobile phone, I expect ekiga to play the ringtone and show a message that there is an incoming call. However, ekiga does not do anything and after a few seconds the call is terminated automatically. But it is not the same as if ekiga is not running because if ekiga is not running I get the message that the subscriber is not available.

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Ubuntu :: Missing Incoming Sessions In Empathy?

May 17, 2011

This is an odd one, and it's probably just my system - I don't receive half of the new MSN messages I get sent. If I talk to someone and leave the window open, I'll get all of their messages; if I close the window, there's only a 10% chance I'll get their reply.

This happened once before, and telepathy-logger was having a fit; it's not this time. Has anyone else encountered any issues in the new release?

Amendment: Pidgin seems to work ok, but I miss the empathy integration; the pidgin plugin for notifications takes the edge off for now.

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Ubuntu Networking :: Loads Of Incoming UDP Traffic?

Jun 29, 2011

My laptop has become very sluggish. So I loaded firestarter firewall. It is reporting loads of incoming UDP traffic. I only use this machine for Skype and Firefox based work as most of my stuff is kept on the cloud. Is it safe to stop all this UDP traffic? It would free up my CPU I guess. It seems port 56095 is getting hammered.

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Ubuntu :: Skype Incoming Video Freezes After 30-60 Seconds?

Jan 6, 2010

My problem is this: the video that I receive during a video call will freeze after about 30 to 60 seconds. Before that, it works fine. And the outgoing video (that which I send to the contact on the other end of the call) is fine throughout.

If my contact resets their video by turning it off and then on again during the call, it will usually work again for a few seconds. Then, as always, it freezes.

So, I am clearly receiving the signal. But maybe I am overloading something? Is this a graphics card problem?

* Mobile Intel 915GM Express card
* IBM Lenovo X41 laptop
* Intel Centrino processor
* Ubuntu 9.10 (Karmic)
* Skype

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