OpenSUSE Network :: When Disable Firewall / Delayed Messages Can Again Be Sent
Sep 14, 2011
I have been running Senmail on SuSE 11.1 for the last few years with no problems.Since installing SuSE 11.3 a few months ago I have been having problems getting Sendmail to send to some (only a few) servers.If I disable the firewall # SuSEFirewall2 stop.I can send successfully using # sendmail -v -q, or # sendmail -v -qIxxxxx.When I re-enable the firewall I will start to get the timeouts/temporarily unavailable messages again (but as mentioned above, only for some servers) even though I can successfully telnet these servers when the firewall is on. When I disable the firewall the delayed messages can again be sent.Has anybody any ideas what I need to change (presumably in the Firewall) to get things working correctly? 'SMTP with sendmail' is already selected under 'Services to Allow' under YaST Firewall->Allowed Services..
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Mar 25, 2011
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.
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Mar 23, 2010
In the firewall, I opened port 5900 for TCP traffic. Now the console is displaying packet information whenever a connection is made. Why does it send a message to stdout/stderr for an allowed connection? How can I stop it? Logging level is set to critical only, and not-accepted packets should only be logged for the internal and DMZ zones.
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Jul 19, 2011
I'm running OpenSUSE 11.4. The problem is that I can set easily what to log (for firewall), but not where to log. And currently the same logs are written to /var/log/firewall and /var/log/messages. I still want messages be written into the first one, but not the second one — it is redundant and it is polluting regular system logs.So how to stop the firewall from writting logs to /var/log/messages?
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May 27, 2010
I did a shields up test and it told me that 1056 ports were stealth but that my pc responded to ping and was visible on the net. How do i fix this?
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Apr 7, 2011
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?
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Jul 26, 2010
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 ?
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Mar 29, 2010
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?
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May 25, 2011
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.
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Jun 24, 2010
I've got a strange sendmail problem I've never come across before...Messages less that 2500 lines (approx 169kb) are sent correctly - anything else goes straight into the queue and is never delivered. The server sits in a intranet, is not connected to the outside world, and forwards its mail to a smart host.All configuration has been done through yast, so there are no unusual settings. I've run sendmail on SuSE from version 6 upwards, and this is the first time I've come across this - it's driving me potty
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Mar 29, 2010
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
[Code].....
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May 19, 2010
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.
This is how to check:
Go to Yast > Security and Users > Firewall
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Jul 13, 2010
I can't get my openvpn work if the firewall is on , and I also don't see any option to allow openvpn service in firewall allow service.
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Jul 24, 2010
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.
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Aug 19, 2010
Ok here's my setup :
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.
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Aug 26, 2010
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
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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).
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Oct 22, 2010
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
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Mar 5, 2011
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.
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Mar 11, 2011
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.
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May 25, 2011
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?
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Feb 26, 2011
I am currently facing a problem with rsync (or maybe ssh, I don't know yet). I have daily backups that are done via cron using rsync from my computer (client) to a NAS. And systematically during these backups my computer completely freezes (no remote login possible, nothing), so I have to hard reboot. As you might imagine, I cannot do this every day. In /var/log/messages there is just a line like that :
Feb 26 17:23:53 eggplant rsyslogd: -- MARK --
right before the hang. The rsync worked well before and I don't really know what changed in my system config. In /var/log/rsyncd.log I sometimes (but not every time) I get :
2011/02/26 16:39:19 [13229] rsync error: received SIGINT, SIGTERM, or SIGHUP (code 20) at rsync.c(543) [Receiver=3.0.7]
I aldready update the default rsync from opensuse 11.3 to 3.0.7.7, but it does not help. How can I at least know what is going wrong? I am trying to track down the problem but don't know how to start. Last also a log of the rsync command (client) running ssh in verbose using the command "rsync -av --delete --timeout=180 -e "ssh -v -p xxxxxx -i /root/.ssh/rsync-key_eggplant" /mds root@xxxxxxxx:/volume1/autoBackup/eggplant":
OpenSSH_5.4p1, OpenSSL 1.0.0 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
[code]....
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Jan 30, 2010
I tryed to setup a second IP address with yast on a openSUSE 11.2 on eth0 as eth0:2nd but with a different firewall zone. But SUSE firewall just see eth0.
I want to define with services are available on with IP address. Also with custom rules I can't specify a destination IP.
So now can I do this with yast? Or have I todo this manually without SUSE firewall?
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Apr 27, 2010
I have a couple of openSUSE 11.2 machines and each is directly connected to the Internet (they are not behind a router, firewall, etc). I want them to be able to communicate without any firewall restrictions, but keep the firewall rules for all other IP addresses. Is this possible? the software package I'm trying to use randomly chooses a port to use in the range of 32768-61000 and I don't feel comfortable having a port range that wide open on both machines.
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Sep 27, 2010
I have properly configured my router to open a port for Transmission and Vuze. The OpenSuSE firewall settings are somewhat confusing, however. How do I add a port specifically for the BT protocol? I know it's the firewall causing issues, because when I shut it down, my BT apps roar to life, and die with a whimper when I turn it back on. In Ubuntu, opening a port in the router is automatically configured in the firewall; that is apparently not the case with this distro.
So, when I go to Yast Firewall, I see "allowed services" under the tabs available. When I hit that tab, I see a dropdown menu that contains services such as NetBios Server and Samba Server. Am I choosing one of those available and adding a port to it? Am I adding a custom service via the Advanced settings, and if so, why isn't there a way to label the service so that it shows up under allowed services?
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Dec 3, 2010
.i need to configure squid in my company how to install and configure squid in my SUSE server...
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Jan 1, 2011
I've got my server mostly configured with Samba file shares - I can access from Linux and OSX computers. I've enabled Samba Clietn and Sambar server in the openSUSE firewall settings (on the server), but Windows 7 can't seem to connect. I've been trying to tweak registry keys in Windows and such, but had no luck. However, when I turned off the firewall on the server, I was instantly able to connect. Is there some other service or port I need to open for Windows 7?
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Jan 15, 2011
I used to have Opensuse 11.0 and Vuze 4.0.2 and both were working great. Recently I upgraded to OpenSuse 11.3 and installed Vuze 4.5.10. I did not change any configuration in the ADSL router but now I could not get the smiley icon to go green. I followed all the steps given here: A Quick Bittorrent Guide (with screenshots). It doesn't work. so I modified FW_ROUTE and FW_MASQUERADE to yes in /etc/sysconfig/SuSefirewall2. That also does not work. What did I miss here? My ADSL router is DSL-2640T.
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Jan 15, 2011
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)
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Jul 25, 2011
I am in the process of enabling Samba client and server on my opensuse 11.3 32-bit workstation, and have just looked at the firewall rules (via iptables -L) prior to enabling these applications.I have used iptables a lot before and despite having my network interface defined as being in the External Zone (ie the least trusted, and therefore supposedly the most protected), the first rules in iptables are as follows:
INPUT
target=ACCEPT, prot=all, source=anywhere, dest=anywhere
OUTPUT
[code]....
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