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• remote control android, a reverse ssh tunnel

  <b>Handle With Linux:</b> "Reasons for using a reverse shell include: you can bypass firewalls, you can connect to your phone without knowing the ip, the connection is initiated from the phone so you don't need to have a ssh server listening on your phone. Just think of all the fun this makes possible!"

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• Creating a HTTP Tunnel to a remote NX Ubuntu 10.04 desktop through an ISA proxy

  <b>Hubfolio: </b>"Getting access to your remote Ubuntu desktops through an ISA HTTP proxy can be a pain. This article shows you how to create a HTTP tunnel that will allow you to bypass even the most restrictive proxies and firewalls."

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• Tips on setting up a virtual lab for self-learning networking topics

  - by Harry

  I'm trying to self-learn the following topics on Linux (preferably Fedora): Network programming (using sockets API), especially across proxies and firewalls Proxies (of various kinds like transparent, http, socks...), Firewalls (iptables) and 'basic' Linux security SNAT, DNAT Network admininstration power tools: nc, socat (with all its options), ssh, openssl, etc etc. Now, I know that, ideally, it would be best if I had 'enough' number of physical nodes and physical network equipment (routers, switches, etc) for this self-learning exercise. But, obviously, don't have the budget or the physical space, nor want to be wasteful -- especially, when things could perhaps be simulated/emulated in a Linux environment. I have got one personal workstation, which is a single-homed Fedora desktop with 4GB memory, 200+ GB disk, and a 4-core CPU. I may be able to get 3 to 4 additional low-end Fedora workstations. But all of these -- including mine -- will always remain strictly behind our corporate firewall :-( Now, I know I could use VirtualBox-based virtual nodes, but don't know if there are any better alternatives disk- and memory- footprint-wise. Would you be able to give me some tips or suggestions on how to get started setting up this little budget- and space-constrained 'virtual lab' of mine? For example, how would I create virtual routers? Has someone attempted this sort of thing before: namely, creating a virtual network lab behind a corporate firewall for learning/development/testing purposes? I hope my question is not vague or too open-ended. Basically, right now, I don't know how to best leverage the Linux environment and the various 'goodies' it comes with, and buying physical devices only when it is absolutely necessary.

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• another "SSH connect to host github.com port 22: Bad file number"

  - by Mariusz

  Hello. I have a problem with my first-time ssh connection. Yes, I've already done yours guides, already tried your "Dealing with firewalls and proxies" article and the problem is still occuring. I am using Win7 32bit, Windows Firewall is disabled, haven't any third-party firewalls, ESET Nod32 Antivirus is not blocking any ports, I am not using any PROXY (neither local proxy) . Here goes the logs: Ordinary SSH connection try C:\Users\Mariusz>ssh -vvv [email protected] OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007 debug2: ssh_connect: needpriv 0 debug1: Connecting to github.com [207.97.227.239] port 22. debug1: connect to address 207.97.227.239 port 22: Not owner ssh: connect to host github.com port 22: Bad file number NCAT connection try C:\Users\Mariusz>ncat github.com 22 Strange connect error from 207.97.227.239 (10013): No error 10013 = WSAEACCES I think that method called "smart-http-support" won't be usable for me because I haven't created repo yet. I have just GIT INIT locally, and finished at step GIT PUSH, which returns the same: ssh: connect to host github.com port 22: Bad file number fatal: The remote end hung up unexpectedly corkscrew method (first article from yours guide) . While PUTTYing (with pageant in bg), after inputing login - an error is occuring (MessageBox): Disconnected: No supported authentication methods available And in terminal such message is printing out: Server refused our key Key I have generated correctly, using ssh-keygen. I tried not method by editing ~/.ssh/config yet because I had thought that because I haven't PUSHed anything to my remote repo so I won't be able to CLONE anything. Method called ssh-forwarding is not for my, cause it "requires access to an external ssh server" and I haven't any at this time. What else could I do? Thanks in advance for any help. Mariusz.

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• I get "An error occurred while Windows was synchronizing with [name of time server]." when trying t

  - by ChrisF

  Prompted by the answers to this question I decided to give the Windows built in time synchronisation another go. However, no matter what time server I use I get this error: "An error occurred while Windows was synchronizing with [name of time server]." The help suggests the following as reasons for failure: You are not connected to the Internet. Establish an Internet connection before you attempt to synchronize your clock. Your personal or network firewall prevents clock synchronization. Most corporate and organizational firewalls will block time synchronization, as do some personal firewalls. Home users should read the firewall documentation for information about unblocking network time protocol (NTP). You should be able to synchronize your clock if you switch to Windows Firewall. The Internet time server is too busy or is temporarily unavailable. If this is the case, try synchronizing your clock later, or update it manually by double-clicking the clock on the taskbar. You can also try using a different time server. The time shown on your computer is too different from the current time on the Internet time server. Internet time servers might not synchronize your clock if your computer's time is off by more than 15 hours. To synchronize the time properly, ensure that the date and time settings are set close to your current time in the Date and Time Properties in Control Panel. Now the first reason is clearly wrong - I am connected to the internet. I can see the 2nd being the most likely cause. I have Sygate Personal Firewall running, but it normally asks if something it trying to connect for the first time. Does anyone know I can unblock the NTP protocol - or at least check if it is blocked?. I don't think it's #3 or #4 as I've tried a number of different servers including the one currently used by Atomic Clock Sync. Though if someone knows the address of a UK time server I can double check this.

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• SVN checkout returns 400 error

  - by eboix

  I'm trying to download the http://code.opencv.org/svn/opencv/trunk/ repository of all of the OpenCV source code - as specified in an OpenCV installation tutorial. In the tutorial, the repository https://code.ros.org/svn/opencv/trunk/ is used, but they moved it to http://code.opencv.org/svn/opencv/trunk/, and now you need a password to access the code.ros.org repository. Anyway, I'm using TortoiseSVN to download the SVN repository. (I get the same error with http://sourceforge.net/projects/win32svn/) I get this: Checkout from http://code.opencv.org/svn/opencv/trunk, revision HEAD, Fully recursive, Externals included Server sent unexpected return value (400 Bad request. Method Unknown) in response to REPORT request for '/svn/opencv/!svn/vcc/default' On the TortoiseSVN site I found something about this 400 error: You're behind a firewall which blocks DAV requests. Most firewalls do that. Either ask your Administrator to change the firewall, or access the repository with https:// instead of http:// like in https://svn.collab.net/repos/svn/ That way you connect to the repository with SSL encryption, which firewalls can't interfere with (if they don't block the SSL port completely). Also some virus scanners (i.e. Kapersky) are known to interfere and cause this error. The code.ros.org repository is https://, so I would be able to access it, but I need a password, so I can't. I made an account on ros.org, but it seems that I still need a password (which I don't know) to access the code repository. My username-password combination does not work. I unblocked all of the TortoiseSVN programs in my firewall settings. Nothing changed. I temporarily stopped my firewall to see if it was interfering with my request. I got the same error. How can I do an svn checkout http://code.opencv.org/svn/opencv/trunk/opencv/ so that I don't get this error? Is there any way to make it https://? Any help would be appreciated!

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• Why would I need a firewall if my server is well configured?

  - by Aitch

  I admin a handful of cloud-based (VPS) servers for the company I work for. The servers are minimal ubuntu installs that run bits of LAMP stacks / inbound data collection (rsync). The data is large but not personal, financial or anything like that (ie not that interesting) Clearly on here people are forever asking about configuring firewalls and such like. I use a bunch of approaches to secure the servers, for example (but not restricted to) ssh on non standard ports; no password typing, only known ssh keys from known ips for login etc https, and restricted shells (rssh) generally only from known keys/ips servers are minimal, up to date and patched regularly use things like rkhunter, cfengine, lynis denyhosts etc for monitoring I have extensive experience of unix sys admin. I'm confident I know what I'm doing in my setups. I configure /etc files. I have never felt a compelling need to install stuff like firewalls: iptables etc. Put aside for a moment the issues of physical security of the VPS. Q? I can't decide whether I am being naive or the incremental protection a fw might offer is worth the effort of learning / installing and the additional complexity (packages, config files, possible support etc) on the servers. To date (touch wood) I've never had any problems with security but I am not complacent about it either.

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• Set up layer 2 vlan between 2 data centres

  - by user41679

  Hello, Our data centre provider operates 2 sites, and we currently have equipment in one and would like to have equipment in the second. They've told me that they operate a layer 2 vlan between the 2 sites over a 20gbit connection, and that they'd just give me ethernet cable at each end to connect the locations. At the current site, we have Cisco 2960 48TC-L switches, all the machines are on a 192.168.x.x subnet and we have cisco firewalls with which we connect to our internet provider with. My question is what would I need to do to connect the 2 sites? could I just plug the ethernet cables the provide into the cisco switches, and have the same switches the other end? would I need to set up a separate internal network on the other side and connect both through the firewalls? Would the cisco switches need special configuration? We expect to maintain a number of connections between the 2 sites, and each site would have its own internal dns name like dc1.xx.com. Sorry if I'm being vague or haven't included enough information, I've a fairly good knowledge of hardware but we're down a netops guy at the moment and I'd like to get both sites on-line ASAP! Thanks in advance!

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• why is Outlook 2007 continuously losing Connection to Exchange Server

  - by Manu

  what could be the reason for Outlook 2007 continously losing and reestablishing the connection to exchange? I tried disabling all anti-viruses and firewalls but it did not help. I should mention that even though this seems to happen to all users, some users cannot even send emails because it happens every few seconds while others can work relatively undisturbed (it happens a few times per hour).

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• Security as a Service (SecaaS) for Amazon EC2

  - by Dave

  I'm looking for a security as a service (SecaaS) provider or open source solution for Amazon EC2 instances, however I can't seem to find much on Google or elsewhere so was wondering if anyone knows where I could find this service? Ideally I'm looking for something that offers virtual firewalls, email and web security and virtual spam prevention. If anyone has any information on SecaaS i'd appreciate it, Thanks in advance

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• Passive ftp on Server 2008

  - by xpda

  I have a new Windows 2008 server with IIS7. When I connect to the ftp in active mode, it works fine. In passive mode, it connects, but then times out trying to get the directory listing. I tried disabling both firewalls, but it didn't help. I've tried this with difference client machines and different ftp client software, with no change. Any ideas?

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• Windows Server 2003 R2 SP2 can't access the internet

  - by Ishmael

  Our 64-bit windows server can no longer access the internet although it is a web-server that is hosting webpages accessible by the internet. Since this dilemma the server can no longer receive windows updates or Symantec virus definitions. We have checked our firewalls so nothing is blocked. Any insight on why this issue happened would be appreciated. Also the server is running IE6 which we have been trying to update.

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• Snmp configuration giving me timeout, no response

  - by imaginative

  This is definitely not a firewall issue as no firewalls are in between the src and tgt machines. I'm simply setting up snmp to be queried by a nagios server. My snmpd.conf looks like the following (I'm using net-snmp on Ubuntu 9.10): com2sec nagiossrv 10.10.10.10 public group Nagios v1 nagiossrv view all included .1 access Nagios any noauth exact all none none When I try to walk it: t:/etc/nagios3# snmpwalk -v1 -c public 10.10.10.10 system Timeout: No Response from 10.10.10.10 Any idea where I went wrong with my configuration?

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• OS X stealth mode: where is it enacted?

  - by er4z0r

  I am working through the security guide from apple (which they did not update since Snow Leopard). In the firewall section it states that ipfw has a default allow rule: 65535 allow ip from any to any And if you enable the firewalls 'stealth mode' via the settings the following rule should be added: 33300 deny icmp from any to me in icmptypes 8 The funny thing is: I have stealth enabled and I do not see this rule when doing sudo ipfw print Any idea where stealth mode is enforced if not in the ipfw ruleset?

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• How can I simulate blocking RTMP over port 80 on Windows?

  - by Christian Nunciato

  It seems like this should be so simple, but since this isn't my area of expertise, I'm having a hell of a time figuring out how to do it. Basically, I have a Flash app and I'm connecting to a Flash Media Server to stream some content. The URL I'm using to do this, for example, looks like this: rtmp://someserver.com/some/path/mp3:somefile Everything works -- but that's sort of the problem. When I'm trying to do is simulate my users attempting to play back my media under more restrictive conditions than the ones I have here (i.e., none) -- namely being stuck behind firewalls or proxy servers that block access to RTMP streams. Flash, according to Adobe, is equipped to handle proxy servers and firewalls automatically, like so (from the docs): When you do not specify a port number in an RTMP address, Flash will attempt to connect to port 1935. If it fails it will then try to connect to port 443; if that fails, it will try port 80. [And if that fails, it will attempt to connect via RTMPT (i.e., HTTP tunneling) on port 80.] So no coding is required to access ports 1935, 443, or port 80 if you do not specify a port in the RTMP address. The problem I'm having is setting up a reliable environment in which to test that this behavior actually happens. I'm on a Windows machine, for example, so with Windows Firewall, I can block certain ports and protocols (1935, 443), but I don't want to block port 80, because the final fallback protocol (RTMPT) is supposed to run on port 80, and Windows Firewall only gives me enough granularity (as far as I know, anyway) to block "all outbound TCP traffic to remote port 80" -- that is, I can't, apparently, block "all outbound RTMP traffic to port 80" while leaving RTMPT traffic to port 80 unaffected. My understanding thus far is that I'll probably need to set up a proxy server to do this. Is this correct? Or is there a simpler way (on Win 7, at least) to filter out RTMP to 1935, RTMP to 443, RTMP to 80, but still allow RTMPT to 80 (where all four hostnames are identical)? And if I do have to set up a proxy server, what's the simplest way to go on Windows? I've set up WinProxy, which seems a bit janky but apparently works -- but then what I can't figure out is how to tell Windows to force all TCP traffic (including RTMP, RTMPT and HTTO) through this proxy server so I can turn around and reject the requests for RTMP. Any help would be hugely appreciated. This isn't my realm of expertise and I've alreasdy spent more time on it than I probably should. :)

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• Google Chrome "This webpage is not available" error on Snow Leopard

  - by Oscar Del Ben

  Hi, I'm using Snow Leopard and I've just downloaded Google Chrome for Mac. However it doesn't load any page: This webpage is not available. Error 104 (net::ERR_CONNECTION_FAILED): The attempt to connect to the server failed. I've googled about it but I had no luck, only answers for Windows. Needless to say I have no firewalls and every other browser or application can connect to the internet.

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• connect remotely to apache2 on ubuntu 10.04

  - by ronakin

  I've apache2 server installed on a machine that connected to two different networks, therefore it has two different addresses: 192.168.1.111 (static ip on ethernet network) and 109.253.78.211. when connecting through 109.253.78.211 on the browser, the web pages are displayed perfectly, However, when connecting through 109.253.78.211 the web pages are displayed partially. I've not installed any firewalls. I'll really appreciate if you could redirect me to checks I should commit to reach the source of the problem. Thank you :)

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• Plink/Putty fail on return

  - by jasemccarty

  Any one have any idea why a remote command to a NetApp filer would fail when using Plink/Putty (to execute a command) across 2 networks? Everything is open both ways (multiple firewalls), but the filer seems to be responding from port 22 to some random port. So my Windows box on the other side doesn't know to answer because the target port isn't 22. Any thoughts?

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• Download Virus/Malware Purposefully

  - by Matt Hanson

  Where can I download a virus, work, trojan, etc. for analysis? Yes, I'm actually hunting for malware, rather than keeping it at bay and hiding behind antivirus software and firewalls. I plan to analyze it in a lab for a project, but don't know where to even begin finding one.

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• Web Farm Framework - Adding servers are offline

  - by Johan Wikström

  My problem is that im trying to setup a server farm but the nodes all come up as offline. I dont get a connection error saying that the servername is wrong, but get "offline" after it "test connection" I have: - Setup firewalls rules to allow Remote and file share on Domain and private network - Installed WWF 2.0 on both servers - Account that im using is a domain account that is Administrator on both machines. www01 is the same server as the controller below, but same results if i try www02 as primary. Any ideas?

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• SafeOffice 500 - how to enable VPN access to another network (out)

  - by Dani

  Hi, I have a safe office 500 box at my edge. (checkpoint's hardware firewall) I'm trying to connect to another office VPN using windows 7 pptp connection. It fails (saying something about enabling GRE). (after authenticating, hangs for a while, than give the error message.) Using the same computer with direct internet access (not behind the firewalls) works fine and I get connected. how do I setup the safe office to enable me to use vpn (pptp) out connections.

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• Symantec Gateway Security 320 VPN/Port Forwarding trouble

  - by Owl

  How do I check to see if port forward is enabled with one of my dynamic tunnels on this device? I'm having trouble using a feature in our software that requires a vpn to be used. My firewalls shows it as connected but I'm unable to ping the subnet ip. Our software vendor told me that port forwarding might be causing this problem, but I didn't set up this network I'm on and I don't fully know symantec hardware.

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• How do you enable Remote Connection with SQL Server 2008 w/o Installing Management Studio?

  - by danmine

  I'm having a rather tough time finding information on this since almost everything I read requires Management Studio installed in the server which I prefer not to do. Also, to connect to it using SQL Server Management Studio installed on the client, are these settings ok? ServerName: 10.232.234,1433\SQLEXPRESS Login: sa Password: password Yes, I want to specify the port number in the client side since I have to go through a few firewalls which I have poke holes through to get to the SQL Default port 1433.

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• How to reliably keep an SSH tunnel open?

  - by Peltier

  I use an SSH tunnel from work to go around various idotic firewalls (it's ok with my boss :)). The problem is, after a while the ssh connection usually hangs, and the tunnel is broken. If I could at least monitor the tunnel automatically, I could restart the tunnel when it hangs, but I haven't even figured a way of doing that. Bonus points for the one who can tell me how to prevent my ssh connection from hanging, of course!

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• How to perform "tracert" like operation from browser?

  - by user329777

  I'm remotely investigating issue with my friend's WIN XP computer. The browsers (Chrome and IE) won't show any pages but message with err_connection_reset in details. I've tried to perform "telnet google.com 80" and send there "HEAD / HTTP/1.0" from console and everything went fine, but browsers refused to give me anything. I've checked for presence of firewalls and proxy servers in the settings, but nothing seems to be there. What else to check?

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