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• ssh tunnel via multiple hops

  - by Mala

  Tunneling data over ssh is pretty straight-forward: ssh -D9999 [email protected] sets up port 9999 on your localhost as a tunnel to foreignhost.com, but I have more specific need: I am working locally on localhost host1 is accessible to localhost host2 only accepts connections from host1 I need to create a tunnel from localhost to host2 Effectively I want to create a "multi-hop" ssh tunnel. How can I do this? Ideally, I'd like to do this without needing to be superuser on any of the machines.

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• Why can't I connect to remote Microsoft SQL Server through SSH tunnel?

  - by Alexander

  I have at home a D-Link DIR-615 C1 router with DD-WRT. I set up the SSH server on the router, and log on through an SSH2-RSA passphrase-protected key. That router is the gateway between the local network and the internet. One of the computers on that network has Microsoft SQL Server 2008 installed, with TCP/IP protocol enabled through port 1433. I've set up port forwarding on the router, so that remote connections are possible and are, in fact, working (some developers log on remotely without problems). I am part of another network, that has internet access through a proxy server, which only has ports 80 and 443 opened. I can't connect to that MSSQL server on that remote server because 1433 port is closed on this network. I connected (using Putty) through 443 port to my router's SSH server, and set up 2 tunnels. One is for RDP (3389), and it's working. The other is for 1433 port, to connect to the server. I can't connect through the SSH tunnel to the MS SQL Server, neither through telnet, or through GUI clients. Am I missing something? Additional details: on connect, I get this error from SQL Server Management Studio: TITLE: Connect to Server Cannot connect to localhost:14330. ADDITIONAL INFORMATION: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 3) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=3&LinkId=20476 BUTTONS: OK The tunnel is configured like this: L14330 192.168.0.103:1433 192.168.0.103 is the permanent address of the SQL Server on the LAN. I also successfully forwarded TCP traffic of 3389 port to that IP, so tunneling is working to that IP address. When connecting without tunnel, through Microsoft SQL Server Management Studio, using the same method the connection establishes. Too bad my proxy doesn't allow 1433 port traffic, I wouldn't have this headache.

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• Bittorrent surveillance/monitoring

  - by Flamewires

  Is there any tool to sniff bittorrent traffic and reassemble data about the torrent? Im looking for file names, peers, tracker address, local IP, etc. This is purely for academic interest in which all parties would be willing participants and therefore please dont upvote responses that talk merely about legal issues with using this kind of approach on a production network. I also am assuming that the torrent connections are unencrypted. Thanks

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• iptables : how to correctly allow incoming and outgoing traffic for certain ports?

  - by Rubytastic

  Im trying to get incoming and outgoing traffic to be enabled on specific ports, because I block everything at the end of the iptables rules. INPUT and FORWARD reject. What would be the appropiate way to open certain ports for all traffic incoming and outgoing? From docs I found below but one has to really define both lines? iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT I try to open ports for xmpp service and some other deamons running on server. Rules: *filter # Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT -d 127.0.0.0/8 -j REJECT # Accept all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow all outbound traffic - you can modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allow HTTP # Prevent DDOS attacks (http://blog.bodhizazen.net/linux/prevent-dos-with-iptables/) # Disallow HTTPS -A INPUT -p tcp --dport 80 -m state --state NEW -m limit --limit 50/minute --limit-burst 200 -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -m limit --limit 50/second --limit-burst 50 -j ACCEPT -A INPUT -p tcp --dport 443 -j DROP # Allow SSH connections # The -dport number should be the same port number you set in sshd_config -A INPUT -p tcp -s <myip> --dport ssh -j ACCEPT -A INPUT -p tcp -s <myip> --dport 5984 -j ACCEPT -A INPUT -p tcp --dport ssh -j REJECT # Attempt to block portscans # Anyone who tried to portscan us is locked out for an entire day. -A INPUT -m recent --name portscan --rcheck --seconds 86400 -j DROP -A FORWARD -m recent --name portscan --rcheck --seconds 86400 -j DROP # Once the day has passed, remove them from the portscan list -A INPUT -m recent --name portscan --remove -A FORWARD -m recent --name portscan --remove # These rules add scanners to the portscan list, and log the attempt. -A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:" -A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP -A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:" -A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP # Stop smurf attacks -A INPUT -p icmp -m icmp --icmp-type address-mask-request -j DROP -A INPUT -p icmp -m icmp --icmp-type timestamp-request -j DROP -A INPUT -p icmp -m icmp -j DROP # Drop excessive RST packets to avoid smurf attacks -A INPUT -p tcp -m tcp --tcp-flags RST RST -m limit --limit 2/second --limit-burst 2 -j ACCEPT # Don't allow pings through -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP # Log iptables denied calls -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT

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• OpenVPN multiple servers on the same subnet, high availability

  - by andre

  Hey everyone. Let me start by saying that my Linux experience isn't super awesome but I can usually find my way around things easily. Over at work we have an OpenVPN setup that's been due for some improvement for a while now. The main server (tap mode) runs in our office, behind a rather slow DSL connection. The main problem is that, since I'm usually out of the office, every time I want to access something on the virtual network I have to go through that server to get anywhere else. We have two servers up on 100 Mbit connections that we use for development and production purposes, about 3 more servers in the office (one of them behind a different T1 line for VOIP) and about two dozen clients who use the network on a daily basis from various locations. We've had situations where network routing (outside of our control) would not allow people to reach our main OpenVPN server whilst the other locations were connectable. Also any time someone outside the office wants to fetch something from any of the servers (say, a 500 MB code repository), a whopping 20 KB/s download speed is just unacceptable these days (did I mention slow DSL? ok). We had to implement traffic shaping on this server since maxing out this connection was fairly trivial. I had the thought of running two (or more) OpenVPN servers in the network. These would have to have the same subnet though, as our application relies on virtual network's IP addresses for some of its core functionality. The clients would also preferably retain the same IP addresses but that's not vital. For simplicity, lets call the current server office and the second server I'm setting up, cloud. Call the server on the T1 phone. This proved to be rather complex because as soon as I connect to cloud, I cannot see office. Any routes to a server that would go through office also do not work while I'm connected to cloud (no ping, nothing) and vice-versa. There's no rules for iptables that would be blocking the traffic either. Recently I came across this article on linuxjournal but the solution they provide seems to only cover the use of two servers and somewhat outdated (can't even find much documentation, their wiki is offline). They also state that adding more servers would be a complex task. Ideally I would like to keep the existing server office running the virtual network and also run the OpenVPN daemon on the cloud and phone servers (100 Mbit and very reliable connection, respectively) so that we're on safe ground in case of a hardware failure, DSL failure, etc. So, in essence, I'm looking for a highly available OpenVPN solution (fix, patch, hack, tweak, whatever you want to call it) that will accept connections on multiple hosts (2 or more) whilst keeping the same IP address subnet regardless of the server to which you connect to. Thanks for reading and sorry for the long post, I hope it gets the point across :P

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• Deny login from certain hosts if logging in with specific sql credentials

  - by Dave

  I want to stop some of our developers from connecting to the production sql server using a specific sql account. They have rights to connect through windows authentication with lower rights. They claim that changing the password will affect too many other processes running on our processing machine. So I want to deny access if they're connecting from there dev machines for now. Another way this would work is if I could just allow connections from one specific host.

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• How can I port forward with iptables?

  - by stu

  I want connections coming in on ppp0 on port 8001 to route to 192.168.1.200 on eth0 on port 8080 I've got these two rules -A PREROUTING -p tcp -m tcp --dport 8001 -j DNAT --to-destination 192.168.1.200:8080 -A FORWARD -m state -p tcp -d 192.168.1.200 --dport 8080 --state NEW,ESTABLISHED,RELATED -j ACCEPT and it doesn't work, what am I missing?

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• Is anyone using Node.js as an actual web server?

  - by Jeremy

  I am trying to convince myself to pick it up and start developing with it, but I want to know if anyone has expected stability issues or anything of the sort. I understand it isn't "production" quality, like Apache or IIS. I figure for a small site, it should be fine (max of 200 concurrent connections). Should I assume this?

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• Able to connect to the net, but only through FF with proxies disabled.

  - by Mr Z

  I guess I got a virus or something and it's screwing up my connections. I'm able to browse fine in Firefox with proxies disabled, but other than that I have no connection. Currently, I need to install a program, but it requires an internet connection, and it keeps running into connection errors - same problem the other day when trying to register a product I purchased. I usually can figure this stuff out, but this one has me baffled. Any help troubleshooting this would be much appreciated.

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• Run Java Project from Ubuntu Terminal?

  - by Christopher Gwilliams

  I have a small java project that handle connections. In order to run it from the terminal I have to cd into the folder that contains the source and run the following command: java -cp classes com.packagename.mainclass Where classes is the folder that contains the classes. I want ubuntu to run this application on startup, is there a Java command I can use? Or am I just better off creating a shell script? Thanks!

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• Use Cherokee Instead of nginx in Front of Varnish to Get HTTP 1.1 Optimizations?

  - by espeed

  We have been running nginx - uWSGI, and now we are evaluating putting Varnish as a caching layer between nginx and uWSGI (similar to http://www.heroku.com/how/architecture). But, nginx only supports HTTP 1.0 on the back so it will have to create new connections with Varnish for each request. Many recommend running nginx in front of Varnish, but wouldn't it make much more sense to use something like Cherokee so that you eliminate the HTTP connection overhead since it supports HTTP 1.1 on the back?

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• Setting up Windows 2008 VPN Server

  - by Ivan Vovnenko

  Hi, i'm trying to setup windows 2008 server as a L2TP/IPSEC VPN server (PPTP is not secure), to receive windows (xp+) and Mac connections. The win2008 is behind the router. Can anyone provide easy step-by-step instructions? I tries several tutorial but no luck. Also VPN clients setup both on mac and windows would be very helpful. Thanks in advance.

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• Web server send outgoing request to specific isp gateway

  - by itsoft3g

  I have a server with 5 ISP connections, i am using Apache web server and php engine to run my application. Outgoing request to different API now needs to be send through a specific ISP (or a different IPs). All my API request are sent using PHP and Web server. I am not sure that php will directly communicate with Gateway or it send request via web server. Please help me to setup this. Thanks in advance.

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• CMAK Custom Action to run synchronous executable

  - by Charles Gargent

  I am using the Connection Manager Administration Kit (CMAK) to create vpn connections for my users, if it is possible how do I create a custom action that launches an executable that runs synchronously? In the help file it says Only DLLs run synchronously, meaning that Connection Manager starts the action and then waits for the function to return before continuing Is there any way around this? I have seen something similar called VPN-Q which from the screen shots appear to do just that.

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• Connection to VPN using command line

  - by plurby

  I've wrote a simple batch file to connect to a specific VPN connection using RASDIAL rasdial MyVPNConnection but it always returned the error 691 Access denied because username and/or password is invalid on the domain. Remote Access Service (RAS) Error Code List then i tried pointing to my Remote Access Phonebook (Rasphone.pbk) and see what happens rasdial MyVPNConnection /phonebook:%userprofile%\AppData\Roaming\Microsoft\Network\Connections\Pbk\rasphone.pbk and still there was an error 691. I've then unchecked the following but still the same problem was reported when executing my batch file.

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• On a linux server how do you use multiple terminals over a single ssh connection?

  - by epochwolf

  I often find myself opening several ssh connections in order to view several log files at a time with tail -f. This isn't a problem when I'm at home because I use public key encryption for password-less login. However, I will often use computer at my university to do this so I don't have the option of using my private key. It gets annoying to enter my password 4 or 5 times to get several terminal windows. How can I get multiple terminals over a single connection?

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• How to connect to a remote IIS with INETMGR on WIndows 7

  - by Chris Marisic

  I can't seem to find any way to connect to a remote IIS instance with my local INETMGR on my Windows 7 machine. It shows my settings for my local IIS and everything I've tried from clicking various places on the connections panel, changing the address in the address bar and checking the various menubar menus none seem to offer connect to another machine.

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• How to use DNS to redirect domain to specific port on my server

  - by Tomaszs

  I'm running a web server on port 80 and another on port 87. I would like to use DNS so that www.example.com goes to port 87. How can I accomplish this using DNS only? Canonical Question: This question was originally asking about running IIS and Apache on the same server, but the same concepts can be applied to any server software receiving connections from clients. The Answers below describe the technical problems with using DNS to assign a port number for a client to connect.

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• Wireless Connection unstable when multiple devices connected

  - by KingIsulgard

  My wireless network works perfectly when only 1 device is connected. Super fast, full strength. But as soon as multiple devices are connected to the wireless network the connections become unstable (constantly losing connection). It's quite annoying. I have a Sitecom Wireless 300N XR Gigabit Router WL-306, which should be a decent router so I'm guessing there must be something wrong with my configuration. Does any of you know what might cause this? Thanks

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• How to securly join two networks together over the Internet?

  - by Pyrolistical

  Let's say there are two locations. Both locations have their own fast Internet connections. How do you join these two networks together such that every computer can see every other computer? Do you need a domain controller, or can you do this with workgroups? EDIT The obvious solution seems to be VPN, but can VPN be implemented on the routers only? Can the computers on the network be configuration free?

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• Recent remote desktop connection sources

  - by altendky

  How can I identify the source of recent remote desktop connections to my computer? While at work I connected to my desktop there (XP SP3) from another system with files I want to access. I am now at home and connected to my desktop at work but I do not know the name of the other system there.

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• Nginx Global Error Page

  - by sidprak

  I see this question was also asked here: Configure Nginx global error page but there wasn't a suitable answer. I am currently allowing only certain IPs to some of my sites and would like Nginx to drop connections from the rest of the IPs instead of returning a 403. Ideally, I would like to do this without configuring each site separately. I have this in the http section: error_page 403 =444; But, now, it tries to serve up the page =444 instead of returning a 444.

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• Replace DNS on Openvpn client without redirect-gateway

  - by Gabor Vincze

  I am trying to push DNS to the client with OpenVPN server with config: push "dhcp-option DNS 192.168.x.x" It is working well, but what I really need is that during the VPN connection I do not want to use my primary resolvers, clients should use only the DNS provided by the server. It can be done with push redirect-gateway, but I do not want to tunnel all connections from the client thru the VPN, only specific networks. Is it possible to do it somehow? Linux clients are OK with a script, on Windows I am not sure

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• Online portmap service

  - by Frantic

  Hi! Is there any online web-service, that offers portmap? My corporate proxy allows only 80 port connections, and I need ssh (20 port). So I could connect to http://some-proxy.org/mysite_80/ and use it as gateway?

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• outbound ftp on server 2008 r2 stalls

  - by Scott Kramer

  the built in command line ftp client in server 2008 does not support passive mode so I've used these commands to allow outbound ftp (it stalls without this) 1) Open port 21 on the firewall netsh advfirewall firewall add rule name="FTP (no SSL)" action=allow protocol=TCP dir=in localport=21 2) Activate firewall application filter for FTP (aka Stateful FTP) that will dynamically open ports for data connections netsh advfirewall set global StatefulFtp enable however in server 2008 r2, these commands seem to work, but it does not affect the outbound ftp, it stalls I do not want to use an alt client

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