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• "Play on another device" function not working with Samsung Allshare

  - by Tural Teyyuboglu

  Briefly I can't get work "Play on another device" function More detailed My Samsung TV (which support network) and PC are in the same network. The problem is, I can play PC contents from TV. But when I try to control TV remotely from Allshare software (PC), it shows TV only as connected device: But not as remote player in "players" list The result Tried to turn off firewall completely, reset router, re-install software. No success. Please help. BTW. On this link they kinda explained how to do it, but I software doesn' detect the TV as player in my case: http://www.samsung.com/global/allshare/pcsw/quickguide.html

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• Windows Server 2008 SOMETIMES blocks connection to an FTP Site

  - by ssilver2k2

  Hello Everyone Recently, our company has been having issue connecting to a special FTP server that we use offsite to upload small files. We can connect to the test server perfectly fine, but when we use the production ftp, it only randomly connects. If I plug my laptop directly into the modem and pull one of our other static IP addresses, I can connect just fine, but if I use our internal network, it is hit or miss. Also, turning OFF the firewall does NOT change the status of our connection problems. It will still time out. The weird issue is that it sometimes works, and when it does, it instantly asks for credentials and logs us on for that session, but if we disconnect and try again, it may or may not work. This also coincidentally occurred after uninstalling hamachi, and it blew away our internet settings on our Windows Server 2008 box, but everything else is working fine, and it was working fine before hamachi was installed.

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• how to separate a network for traffic

  - by Student_CVO

  At the moment our all computers in one big LAN, it is the intention to separate the admin and edu (it's in a school) especially for traffic and less for security. How do this best? I have a drawing, but can't post it (a can send it in a mail) Firewall?, VLAN?, IPCop (no two green zones)?, pfsense? ... Should there be two scopes on the dhcp server (WIN 2008 R2), one for admin and one for edu or is one scope enough? I would like your advice, I am a student in training with this task as a project. Thanks

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• Ping, firewall or DNS issue on Win Server 2008 R2

  - by Fred Kaiser

  I've installed windows server 2008 as a VM for the developers here to work on. Installed SQL Server 2008 as well as IIS7. I am not quite sure why, I can remote into that machine using the name I gave to it (winserverdev) but the guys that are supposed to use the bloody thing can't. One very interesting thing is that I can connect but I can't ping... not the name nor the IP address. Is there anything that I should be looking in order to make it work? Any ideas are welcome. Thanks heaps in advance, I really appreciate it.

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• Concerns about a Dedicated (Windows Server 2008) + DDoS

  - by TheKillerDev

  I am have today a dedicated server with these specs: Intel Core i5 750, 2x120GB (ssd + raid), Windows Server 2008 Web, 200Mbps Network, 24 Gb DD3 And I would like to know what are the best thing I can do to prevent a DDoS Attack, since I know this will be a real threat by the importance of the files that will be archived in it. Today I have apache listening port 80 and RDC listening port 3389. But the security is beeing made only by Windows Firewall. So, any thoughts on what would be good to prevent from DDoS attacks?

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• Single hardware unit to protect web servers and implement smart publishing

  - by Maxim V. Pavlov

  Thus far we've been using the combination of Forefront TMG 2010 as an edge firewall + intrusion prevention system + web site publishing mechanism in the data center to work with a few web server machines. Since we develop on ASP.NET, we are IIS and in general - Microsoft crowd. Since TMG is being deprecated, we need to come up with a hardware alternative to protect and serve our data center web cloud. Could you please advise a hardware or virtual appliance solution that can provide routing, flood prevention and smart web-site publishing (one IP - many web sites based on domain name filter) all in one. Even if it is hard to configure, as long as it covers all these features, we will invest to learn and replace TMG eventually.

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• How to enable RDP to a Server 2008 R2 on another network? VM network

  - by Saariko

  I have a W2008 R2 installed on a different network (I am on 192.168.0.x - new server on 192.168.3.x) I had trouble ping and RDP to it. I disabled the firewall to test the connection: and that opened the ping feature but I still can not RDP to that machine. the allow remote access is enabled As per sinni80 idea - Here is the error message The networks are divided by a Fortigate 60-B router - 2ndy interface for the gateway is 192.168.3.254 (and pingable from all) any to any rule on both networks is in place. As per Joe Schmoe idea - I am able to RDP to 192.168.3.1 from 192.168.3.3 (which is on the same network) Data to add: - The servers are on a VM host, each of the servers has 2 nics one is DHCP enabled into the 192.168.0.x network 2nd is static IP in the 192.168.3.x -- Further information: The network 192.168.0.x - are on a domain network (active Directory) The network 192.168.3.x - are grouped in a workgroup What should I check more please?

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• What is a good solution for an adaptive iptables daemon?

  - by Matt

  I am running a series of web servers and already have a pretty good set of firewall rules set up, however I'm looking for something to monitor the traffic and add rules as needed. I have denyhosts monitoring for bad SSH logins, and that's great - but I'd love something I could apply to the whole machine that would help prevent bute force attacks against my web applications as well, and add rules to block IPs that display evidence of common attacks. I've seen APF, but it looks as though it hasn't been updated in several years. Is it still in use and would it be good for this? Also, what other solutions are out there that would manipulate iptables to behave in some adaptive fashion? I'm running Ubuntu Linux, if that helps.

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• Linux - Block ssh users from accessing other machines on the network

  - by Sam

  I have set up a virtual machine on my network for uni project development. I have 6 team members and I don't want them to SSH in and start sniffing my network traffic. I already have set the firewall on my W7 pcs to ignore any connection attempts from the Virtual Machine, but would like to go a step further and not allow any network access from the VM to other machines on my network. Team members will be access the VM by SSH. The only external port forwarded is to vm:22. The VM is running in VirtualBox on a bridged network connection. Running latest Debian. If someone could tell me how to do this I would be much obliged.

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• Why would the servers network type change from Private to Public?

  - by Phil Hannent

  Just found a fault with a server, other users have had problems connecting to it. The setting on the network card had changed from Private (domain) network to Public (the other option being Home). The switch to the network interface would have caused the firewall to block a lot of normal functions. I am guessing that since the event log showed no reason for the change that it might be due to a complete shutdown we had recently where someone powered up the machines, however the domain controllers might not have been booted up first. Any confirmation that this might be the case?

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• iptables firewall rules not allowing ssh from lan to DMZ

  - by ageis23

  Chain INPUT (policy ACCEPT) target prot opt source destination REJECT tcp -- anywhere anywhere tcp dpt:www reject-with tcp-reset REJECT tcp -- anywhere anywhere tcp dpt:telnet reject-with tcp-reset ACCEPT 0 -- anywhere anywhere state RELATED,ESTABLISHED DROP udp -- anywhere anywhere udp dpt:route DROP udp -- anywhere anywhere udp dpt:route ACCEPT udp -- anywhere anywhere udp dpt:route logdrop icmp -- anywhere anywhere logdrop igmp -- anywhere anywhere ACCEPT udp -- anywhere anywhere udp dpt:5060 ACCEPT 0 -- anywhere anywhere state NEW logaccept 0 -- anywhere anywhere state NEW ACCEPT 0 -- anywhere anywhere ACCEPT 0 -- anywhere anywhere ACCEPT 0 -- anywhere anywhere logdrop 0 -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination REJECT 0 -- 192.168.0.0/24 192.168.2.0/24 reject-with icmp-port-unreachable ACCEPT tcp -- choister 192.168.2.142 tcp dpt:ssh state NEW REJECT 0 -- 192.168.0.0/24 192.168.3.0/24 reject-with icmp-port-unreachable ACCEPT gre -- 192.168.1.0/24 anywhere ACCEPT tcp -- 192.168.1.0/24 anywhere tcp dpt:1723 ACCEPT 0 -- anywhere anywhere ACCEPT 0 -- anywhere anywhere ACCEPT 0 -- anywhere anywhere ACCEPT 0 -- anywhere anywhere TCPMSS tcp -- anywhere anywhere tcp flags:SYN,RST/SYN TCPMSS clamp to PMTU lan2wan 0 -- anywhere anywhere ACCEPT 0 -- anywhere anywhere state RELATED,ESTABLISHED logaccept tcp -- anywhere choister tcp dpt:www TRIGGER 0 -- anywhere anywhere TRIGGER type:in match:0 relate:0 trigger_out 0 -- anywhere anywhere logaccept 0 -- anywhere anywhere state NEW logdrop 0 -- anywhere anywhere The ssh server I'm trying to connect to is in the DMZ(192.168.0.145). It's mainly used as a web server. I need access to it from my room 192.168.2.142. I don't get why ssh can't forward onto the 192.168.2.0 subnet? I'm sure it's the reject rule that causing this because it works without it.

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• Virtualizing Firewalls/UTM

  - by TheD

  So Sophos UTM (Astaro Gateway UTM) can be virtualized in Hyper-V, VMWare, vSphere etc. Now I'm new to virtualization, so am wondering how the networking would be configured in this situation. Imagine the following (a very simple setup). A Zyxel router acting as the default gateway, standard ADSL line. This is connected directly via Ethernet to my VHost, Hyper-V in my case. Now I assume I need two virtual network adapters, one which is the "External" interface to the firewall, and the other being the "Internal" interface. But where does my switch go, since I have 5 machines (or X number of machines). Where is the switch connected, to the internal interface on the VHost? What default gateway do my clients use etc? How would the routing work if these two interfaces weren't bridged since they are virtual networks anyway. I'm a little confused! Any advice is much appreciated! Cheers

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• Restrict VPN Clients to VPN Server

  - by Sprotty

  I've setup a VPN server using Debians pptpd. This all works, but I want to restrict incoming connections so they can only access ports on the VPN server and not get access to other machines on the VPN servers local network. I'm guessing this is a firewall rule? but i'm new to linux so am struggling a bit... ---- Additional info ----- The VPN Server is also hosting an SVN server, which is its real purpose, and the only service I want it to expose to incoming connections. I guess I could expose the SVN server directly, but I'm not confident that I could secure this correctly, so a VPN seemed to give an additional layer of security.

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• how to configure svn between two remote system on different network?

  - by Ghost Answer

  The story is that I have two systems on two different network IPs (like client on 10.0.15.24 and server on 117.152.18.140). I am communicating between them by team viewer port 80. I have installed svn subversion on server and svn client on client system. I also installed apache server on server system. Now my question is that I want to configure them. first is it possible, if yes, then please give the proper suggestion. Is there any changes to be make in firewall on server or client or both. thanks

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• virtualbox port forwarding - firewall config

  - by Roose

  i have a ubuntu host system with virtualbox running a windows server. In Virtualbox i have configured the network with a NAT interface and port forwarding for the RDP deamon running inside the vm. That works really well - i can connect to the windows rdp service over the internet. TCP *:3389 - *:3389 Now i like to restrict the access to the rdp service to only 3 public ip addresses and have no idea how to do that via iptables / shorewall. Something like: ACCEPT net:91.x.x.x fw tcp 3389 (shorewall rule) isn't working. Would be glad for any hint.

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• Verizon Fivespot firewall

  - by Patrick

  I have a Verizon Fivespot Wi-Fi router and am having issues connecting to the computer that uses it to get on the internet. I am able to connect to the Fivespot admin pages remotely and I am able to connect to the internet from the computer behind the Fivespot. There are two sections pertinent to this issue, Port Filtering And, Port Forwarding I've tried each individually and both together but cannot access anything through the router except for the admin page. I am trying to connect through SSH to an Ubuntu 10.04 box over wifi. I have called Verizon Tech Support but they were unhelpful, the person essentially read what it says on each screen without any elaboration. Any help is greatly appreciated!

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• How to show what proxies/firewalls are enabled on Windows XP?

  - by Stephen Melrose

  Hi, I'm trying to fix a Windows XP PC that is having a strange problem. The computer can't seem to connect to the internet, even though an internet connection is present. The router and internet is working fine as I've connected a laptop to it via LAN and wireless and both worked fine. The PC in question is connected to the router as it has an IP from the DHCP. The problem is I can't connect to nor ping any internet address from the PC. I can't even connect to the router admin itself. I've tried both LAN ports in the PC, same problem and both. I'm assuming there's a proxy or firewall on the PC stopping the connections, I just don't know how to find them or see which one is causing the issue. So my question is how do I on Windows XP display the system proxy settings and/or any firewalls that are running? Cheers.

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• Most secure way to have IPtables auto-loaded using Debian / Linux

  - by networkIT

  I'd like to know the safest way to load iptables using Debian. Of course, I can use a script that uses iptables-restore : #!/bin/sh iptables-restore < /etc/firewall.conf but : 1) where is the safest place to have it loaded ? /etc/network/if-up.d ? I'm concerned about the script being loaded early enough at boot time, and reliably enough when plugging/unplugging interfaces ... 2) is this script method using iptables-restore the most secure way ? 3) additionnally, how much does the answer validity stretch to other Linux distros ( Ubuntu, Fedora, CentOS ) ? Thanks ^^

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• Internet connection sharing windows server 2008 R2

  - by This is it

  I have one windows server 2008 r2, and that server has 4 network interfaces (3 private, 1 internet connection). I would like to share internet connection with other 3 networks. Windows server firewall should make logs of data that is transfered. It should not be possible to connect directly to private networks from internet. How could I do it? Edit: I tried with NAT in RRAS, but it doesn't work. Here is the configuration: Server: IP private:192.168.0.1 IP public: xx.xx.xx.xx client IP:192.168.0.2 Default gateway: 192.168.0.1 Public and private interface added in NAT section of RRAS.

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• Tracing what program is making a network connnection? (CentOS)

  - by Airjoe

  I was wondering if it is possible to find out which process is trying to make a specific network connection. On a server I support which hosts websites for about 200 users, the iptables firewall keeps blocking, as it should, a connection to 212.117.169.139 on port 80. Firefox reports this as an attack page (and at the least is obvious spam, if not malicious). It seems something on this server is trying to access this site for some reason, and although it's being blocked successfully, the requests seem to be going through every two to sixty seconds and I'd like to be able to find what process or script is doing this so I can handle it appropriately. Besides doing a grep to try and find if this IP is in some file (which probably won't even work because it may be working by hostname or it may be encoded), is there any way to find out some more information? Thanks!

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• Can't get samba to see other PCs in Kubuntu 10.04 (Lucid)

  - by MaurizioPz

  I'm new to networking. I'm trying to share a folder between to computers (both have kubuntu 10.04 installed). I'm able to share a folder with samba and can see that folder through samba on the same computer. But if I try to go on the other PC I can't see the first one. Both PCs are on the "workgroup" workgroup. I've tried disabling the firewall with firestarter can somebody help me? thanks update: here's my samba.conf http://pastebin.com/SpuES468

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• How can I get rid of the long Google results URLs?

  - by Teifi

  google.com is always shielded by our firewall. When I search something at google.com, a result list appears. Then I click the link, the URL changes to a processed url like: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CDcQFjAA&url=http%3A%2F%2Fwww.amazon.com%2F&ei=PE_AUMLmFKW9iAfrl4HoCQ&usg=AFQjCNGcA9BfTgNdpb6LfcoG0sjA7hNW6A&cad=rjt Then my browser is blocked because of google.com I guess. The only useful information in that long like processed URL is http%3A%2F%2Fwww.amazon.com(http://www.amazon.com). My quesitons: What's the meaning of that long like processed URL? Is there a way to remove the header google.com/url?sa.. each time I click the search results?

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• IOS not saving evaluate rule in access-list

  - by DeeJay1

  Hi. I have a basic firewall set up on an pretty od IOS in form of IPv6 access list exterior-in6 evaluate exterior-reflect sequence 1 permit ipv6 any host [my external address] sequence 10 permit tcp any host [my internal address] eq 22 sequence 11 permit icmp any any sequence 800 permit udp any any range 6881 6889 sequence 900 permit tcp any any range 6881 6889 sequence 901 deny ipv6 any any sequence 1000 IPv6 access list exterior-out6 permit ipv6 [my internal subnet] any reflect exterior-reflect sequence 10 Unfortunately the evaluate exterior-reflect sequence 1 line seems to get lost after each reboot, leaving my internal network without access. Any ideas?

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• Just installed Ubuntu 10.10, can't connect via SSH

  - by swilliams

  I've just downloaded and installed Ubuntu 10.10 in a VM on virtualbox (4.0.4). Everything on the VM is set to the defaults: NAT adapter. When installing the OS, I selected OpenSSH, and nothing else. I've tried to connect to the server via ssh from the host (running Mac OS X), but it only timeouts. Can't scp my credentials to it or ping the server either. As far as I can tell, the server is connected fine, has a valid IP, and can ping google.com. I know I'm missing something basic here... I don't believe I have any kind of firewall up, unless there's one I don't know about that comes with the install. iptables has the default configuration.

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• Packets marked INVALID in FORWARD rule

  - by Raphink

  I have a firewall that has 3 IP aliases on 1 physical interface. Packets get dropped between these 3 interfaces (either ICMP, HTTP, or anything else). We tracked it down to these packets being marked INVALID in the FORWARD rule and dropped due to the this rule: chain FORWARD { policy DROP; # connection tracking mod state state INVALID LOG log-prefix 'INVALID FORWARD DROP: '; mod state state INVALID DROP; mod state state (ESTABLISHED RELATED) ACCEPT; } (That is, we see the INVALID FORWARD DROP logs in dmesg) What could be causing this?

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