OpenSUSE Network :: Suse Firewall Blocking Vnc Over Ssh?
Sep 8, 2010
I've setup vnc over ssh tunnelling however the Suse firewall seems to be blocking it. On the local host I have this in ~/.ssh/config:LocalForward localhost:5900 remotehost.com:5900 The problem is that this only works when I either disable the firewall or add an exception for VNC. Both of these actions defeat the whole purpose of ssh tunnelling since they leave my VNC port open to the outside world (very insecure).
SuSE 10.0 X86 32 acting as my internet gateway and firewall.
eth0 is my internal interface network 192.168.0.0/24 IP 192.168.0.254 dsl0 is my internet connection and is a single ip PtP connection to my ISP.
My internal network is masquaraded onto the external network.
I run an smtp server on my gateway box that I need to be accessable to both the internal and external networks.
However I want to prevent machines on the internal network from establishing connections to external smtp servers, but still alow them to connect to the smtp server on the gateway to send email.
NOTE I do not want to force attempts to connect to [URL] 25 to be re-directed to my internal server I just want to drop or reject the connection.
The firewall up until now has just been configured through YaST, but am not afraid to edit script files if needed
The reason for doing this it to prevent spambots from being able to send through my isp, I keep my own machines clean but sometimes get asked to disinfect machines for other people (family members etc), where I need to connect to the outside world to get updates/virus defs etc, but don't want them spamming from my network.
Printer is connected via USB to server PC running OpenSUSE 11.1 Client PCs are running 11.1, XP, Vista No problem printing from the Windoze machines
Printing is trouble free with the 11.1 client's firewall disabled, but no printer is available with firewall running.
In hopes of diagnosing the problem I figured I'd open everything I could think of until the printer remained available with the firewall running. Then I planned to start removing exceptions one at a time 'til removing one caused the printer to disappear.
I've gone to Yast>Security and Users>Firewall>Allowed Services>External Zone and tried addingSamba Server NetBIOS server Samba Client Samba Server VNC
I setup Mediatomb on another box in my house to connect to with XBMC. XBMC will only connect though if the firewall is off on the local machine. I have both TCP and UCP ports 1900 and 50500 (the port for Mediatomb) enabled on my laptop (local) and the correct ports are open on the remote machine (my wife's vista laptop will connect through XBMC). I can connect to Mediatomb through it's web interface (to set visible folders/files) but not through UPnP (at least not through XBMC)
I've searched a lot across the web and this forum in particular, but wasn't able to find the solution. The settings of the firewall are too cryptic to me. When the firewall is turned off everything is OK, but it is uncomfortable to turn it on and off every time I watch IPTV.
I have a fresh install of SuSE 11.2. I have installed Communigate Pro (Email server) and Webmin. From my workstation (on the same LAN), I can access the web interfaces for both CGP and Webmin right after the server boots up. But after about 10 minutes or so, I can no longer access either web interface. The server itself still functions normally. I can get on the internet with the server, and I can control Webmin via localhost:10000.
The only thing that allows me to connect to it from my workstation again is to either restart the server, or go into "Network > Linux Firewall" and click "Apply Configuration". What's going on that makes my remote access stop working?
I suspect this is an initial configuration bug. All firewall logs seem to be going to all three files. That causes a lot of clutter in the log files, and makes it difficult to see whether there are any serious problems being logged.
As too my question, at this time I dont control the router/firewall an I would like to block a port thats used for guild wars on my workstation for a while. The reason for blocking is children have abused it an lost it.In this case I am trying to block outgoing traffic on port 6112. I have tried setting up a proxy server on the workstation, but the game seems to ignore it an jump on. Due to the environment, I enabled the workstation SuSEFirewall2 firewall an tried setting up "lo" as a internal an configure the firewall as a router, then disable 0/0 an configured for 0/0,tcp,443 an re route port 80 traffic to proxy.
When I had my own internet, I had a transparent proxy enforcing rules for access times. So setting up a proxy on each machine would not be a bad thing, even if it took some creative thinking. I am trying, but seem to be missing something.Ideally, I would like to setup a transparent proxy, as my kids have learned alot about system administration an know to check the proxy module. If all they have to do is un check "Use Proxy" an by pass a local proxy server, then I am kinda defeated. An applications such as firefox have a proxy setting they could set to none instead of system
My firewall keeps blocking something called CPQ-Wbem. There have been about 10 instances of this.
A machine on the network is advertising it runs, or looks for machines running, Compaq Insight Manager on TCP/2301. If the machine isn't yours or you haven't enabled Compaq's web-based remote management then silently drop it.
Now as far as i know i do not have a network, just a dsl connection. I also do not own a Compaq computer. So if someone who has some knowledge of this could you explain to me how a " network is advertising it runs, or looks for machines running, Compaq Insight Manager on TCP/2301 " . This would seem to me to be a local network thing not a www thing ?
I updated my system with system updates and when i restarted.I couldn't access the internet from my desktop. i got on laptop internet worked just fine..i disabled firestarter and mozilla connected to the internet just fine. I turned firestarter on. and i couldn't reach anything.. What do I have to do to get firestarter to allow me to connect to the internet via firefox
My home computer has 11.3 and SuSEfirewall enabled. It connects to the net over the wireless and SuSEfirewall has this connection in the external zone.
I can successfully ssh into this computer from remote (the work computer) but none of the ssh port-forwarded connections work. I'm trying to tunnel VNC over ssh. I also tried setting http on the home computer to serve pages on a high-numbered port (8090) and tunnelling that but it also didn't work - proving that it's not a VNC problem.
Here are the relevant messages from the firewall logs on the home machine:
Code:
I don't understand why this isn't working now, I had the same setup on 11.2 and it worked fine.
The 95.91.92.92 is the public IP address of my home router, I don't understand why a connection would appear to be coming from there when I use ssh-tunnelling?
We are switching from an uncapped 512kb line to a 4MB line at the office... One catch though. The 4MB line will only be linked to a 30GB account, without the option to top up. I therefore have been asked to put something in place to regulate what the staff download at work. Basically block movie, music and torrent downloads should be sufficient, but they would also like to have a list of where staff have been in case of abuse. I have tried OpenDNS in the past, but the guys took great delight in getting around this, and did it within minutes... I can't enter a proxy setting into their browsers, because they all have local admin rights on their Windows boxes and will just disable that. How do I do this on a server level, so that they can't get around this?
I have a remote network that I manage consisting of a DLink DFL-210 firewall/router, and behind that a Dell server running openSUSE 11.2 and a collection of Windows XP/Vista/7 computers.
The Linux box is running OpenVPN as a server (that is how I connect to this network) and a client (it connects to a second server - running XP - at a different location).
The DLink router is the DHCP server and provides addresses on the 192.168.51.0/24 network. The OpenVPN server provides the 10.8.51.0/24 address range.
The remote network that the Linux box connects to is 192.168.54.0/24 via the OpenVPN network 10.8.54.0/24.
I have added routes to the DLink router to route all traffic to the 10.8.51.0/24 and 192.168.54.0/24 networks to the Linux box.
With SUSEFirewall turned off, after I have connected via OpenVPN from my remote computer I can ping all active 192.168.51.0/24 addresses. Other computers on the 192.168.51.0/24 network can ping computers on the 192.168.54.0/24 network. But if I turn on SUSEFirewall, neither of these work. However, I can ping 10.8.54.1 from any computer on the 192.168.51.0/24 network.
How can I set up SUSEFirewall to allow these networks to communicate with eachother?
I want some advice for making my system more secure. I want deactivate any network connection that is unnecessary. Only my browser and the update ability of zypper should have access to the internet. On windows there are personal firewalls.
How can I block internetaccess for all other programmes on openSUSE?
I obviously a noob to Suse but after installing 11.4, and filezilla, i cant connect to my ftp server. Ive opened ports 21 22 and 990 explicitly in the firewall and all I get is a 425 error Cant Retrieve Directory Listing. It logs me in ok but doesnt allow data connections?
Samba is working correctly if Susefirewall2 is off. I have added Samba client and Samba Services for extern access but samba is not working when firewall is now on. Which services should I also add ?
I am trying to add a custom allow rule in the firewall for a range of IPs from 74.201.102.0 - 74.201.103.255, what exactly am I supposed to enter in the source box? I believe I have to add two separate rules for 102 and 103, and I put /24 at the end of both, is this correct to get the whole range of IPs?
1. Under openSUSE 11.2, I allowed printer sharing through CUPS by setting the Firewall to Allow Services of CUPS in the External Zone section. I don't see the CUPS option in the Allow Services of the Firewall under 11.4, any zone. Is my system missing something?2. If I turn off the Firewall, the client computer can see the printers, even get the broadcasted names. If I put port 631 in TCP of the Advanced setting of the External Zone, the client computer can see the printer too, but I know I read somewhere that putting 631 in the External Zone is basically allowing printer requests from the entire internet.
switched recently to 11.2 and it works fine for me as workstation I want to set up a router separating a part of the network and also acting as a firewall/proxy... Configured 2 Ethernet Interfaces, checked Ip forwarding in Yast but it does not forward the packets from the "internal" to the "external" network. Hovewer after I set up my router as default for machines on internal network I can ping the external interface but no adress on external network (particularly the one of the default router) !!! From the router I can reach both networks and the net via default gateway on external. Tried to:
a) switch firewall completely off b) iptables -P FORWARD ACCEPT c) masquarading internal adresses to the external network
my interfaces configuration looks like: eth0 Link encap:Ethernet HWaddr 00:13:D4:E3:A2:7B inet addr:192.168.1.34 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::213:d4ff:fee3:a27b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
We have reason to ask this of you following some strange firewall behaviour - But don't panic If you use openSUSE 11.2 and you think: Your Firewall should be running You are not sure but think it should be check and report back here.
I'm trying to get OpenMPI (a parallel programming library) working on my home system. I have just two machines on it now, t61 and quad, connected through a router. (Which is also connected to cable modem for internet.) I can ssh between the machnes, mount directories with NFS, etc. However, I just can't get the OpenMPI to run. The OpenMPI message board suggested that the most probable cause is that the firewall is blocking TCP. I don't know how to tell if that's the problem, and can't find any manual for the SuSE firewall, while the various Wikis &c that pop up in a search don't provide any information that addresses my problem.
can I deny the access to my server for a specific OS? I have one PC which I want to give it acces from winxp, but if it's boot into ubuntu I want to deny all access to my server, same IP, same ethernet card
I'm in the situation where I'm trying to create 2 private networks using ESX server, all behind a NAT router (static ips are used). I used an openSuse11 vm as a router and was able to configure it so that a machine on one private network was able to access the public network. The problem I have now it that I need to be able to access a machine on the private network from the public network using a different set of IP's.
So if a machine in the private network has an IP of 10.1.0.222 I should be able to ping it using 10.99.0.222 or some other IP. I have never done this before and after reading up on iptables and linux routing I feel more confused than before. Is it possible to add IPs to eth0 (public) and have them mapped to machines on a private network eth1 or eth
I'm looking forward to the release of openSUSE 11.4, which I'm looking to install as an Internet facing gateway on a mini-ITX machine with 2 Ethernet cards. As such I've been reading up on the YaST Firewall trying to find out to configure it, and there's one thing I'd like to be able to do: 'stealth' all the firewall ports.
In other words, if someone were to hypothetically do a port scan of my external IP address, I would rather they not know whether any of the ports on my gateway are open or closed, so instead of replying with the status of those ports the packets get dropped. I've been able to do this with a product called Astaro Security Gateway, which I currently have installed on a second hand Dell Optiplex machine, but I am now looking into the possibility of installing this as a virtual machine inside an openSUSE 11.4 host (extra level of security) and would like the same functionality for the host OS.
How I can refuse an outgoing connection on opensuse firewall by default outbound policy is permissive, and the p2p I explicitly deny an outgoing, according to protocol, remote port and local port.
But I can add rules as how to run opensuse firewall rules are permissive only for inbound traffic and so I can not specifically deny an outgoing connection.
Before using fwbuilder is very powerful and configurable but now I'm with suse for convenience but want to know if you can do what I want, if not I will have to use fwbuilder.
I have done a new install of 11.4 and as with previous versions, I have to go to YAST2 and disable the firewall before I have internet and local network access. Finally I must find out how to do this correctly.
How to I change the default firewall to allow me internet and local network access without disabling it completely? Also I am unclear about the function of Novel Network Armor? What does this do?
