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• SSH via DHCP server

  - by SFault

  I have a DHCP server setup and I can't seem to connect to anything through SSH. When I'm logged in to the server itself, I can SSH. But when I connect any machine to the DHCP server, that machine can SSH but every server I SSH to asks for a password when the normal behavior (when not connected to the DHCP server) does not. Here are the contents of my iptables script that are related to port 22. $IPT -t nat -A PREROUTING -i $LAN -p tcp --dport 22 -j REDIRECT --to-port 22 $IPT -A FORWARD -i $LAN -p tcp --dport 22 -j ACCEPT $IPT -A INPUT -i $LAN -p tcp --dport 22 -j ACCEPT $IPT -A INPUT -i $WAN -p tcp --dport 22 -j ACCEPT $IPT -A OUTPUT -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT $IPT -A INPUT -i $LAN -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT Am I missing something?

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• Two GeoIP databases on one server?

  - by jack

  I have been using GeoIP Lite for visitor ip address to country mapping for a while. The binary data file is at /usr/share/GeoIP/GeoIP.dat Now I just bought a GeoIP Organization license which comes with another binary file with same name of "GeoIP.dat" Where can I put this new "GeoIP.dat" and how can I make both databases accessible to python-geoip library on one server?

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• What compatibility trade-offs do we need to make in order to use a hardened SSL config for Nginx?

  - by nathan.f77

  I found some hardened SSL settings in github.com/ioerror/duraconf. Here is the header from the config: This is an example of a high security, somewhat compatible SSLv3 and TLSv1 enabled HTTPS proxy server. The server only allows modes that provide perfect forward secrecy; no other modes are offered. Anonymous cipher modes are disabled. This configuation does not include the HSTS header to ensure that users do not accidentally connect to an insecure HTTP service after their first visit. It only supports strong ciphers in PFS mode: ssl_prefer_server_ciphers on; ssl_session_cache shared:SSL:10m; ssl_session_timeout 10m; # Only strong ciphers in PFS mode ssl_ciphers ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA; ssl_protocols SSLv3 TLSv1; If we were to use these settings on our website, what does "somewhat compatible" mean? For example, would IE6 still be able to connect?

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• How does the Twitter rate limit API work with multiple accounts?

  - by dfrankow

  I know there's a Rest API to check the Twitter rate limit. To summarize policy: 150 for an IP, and 150 per non-whitelisted account except for searches (which are IP only). However, my app is using Twython, authenticated, but the limit seems to decrease for both my accounts as I use it. Example: No authentication: $ wget http://api.twitter.com/1/account/rate_limit_status.xml -O - <?xml version="1.0" encoding="UTF-8"?> <hash> <hourly-limit type="integer">150</hourly-limit> <reset-time-in-seconds type="integer">1266968961</reset-time-in-seconds> <reset-time type="datetime">2010-02-23T23:49:21+00:00</reset-time> <remaining-hits type="integer">134</remaining-hits> </hash> Authentication with account #1: $ wget --user b... --password=youwish http://api.twitter.com/1/account/rate_limit_status.xml -O - <?xml version="1.0" encoding="UTF-8"?> <hash> <reset-time-in-seconds type="integer">1266968961</reset-time-in-seconds> <reset-time type="datetime">2010-02-23T23:49:21+00:00</reset-time> <remaining-hits type="integer">134</remaining-hits> <hourly-limit type="integer">150</hourly-limit> </hash> Authentication with account #2: $ wget --user d... --password=youwish http://api.twitter.com/1/account/rate_limit_status.xml -O - <?xml version="1.0" encoding="UTF-8"?> <hash> <reset-time type="datetime">2010-02-23T23:49:21+00:00</reset-time> <remaining-hits type="integer">134</remaining-hits> <hourly-limit type="integer">150</hourly-limit> <reset-time-in-seconds type="integer">1266968961</reset-time-in-seconds> </hash> You see how both accounts seem to have exactly the same rate limit info (134/150)? I only used one account in my app, so why do both accounts show decrease?

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• Cannot find my hard disk while installing linux-“No root file system defined” error

  - by Syam Kumar S

  I am trying install Linux on my computer (tried Ubuntu 10.4 and Linux Mint 9). I started the installation wizard and on the hard disk selection page the hard disk is not displayed. I have a 500GB disk with 5 partitions and windows 7 ultimate in one partition. If I click the forward button, it shows an error- "No root file system defined". I have tried to install by booting from CD and pendrive but both shows the same error. When I load Linux as live CD it doesn't show the hard disk. My hard disk works fine in windows 7. System config: intel i3 2100, 500GB hdd, 2GB ram

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• Can't access a local site site on LAN

  - by Dilawar

  I have lighttpd setup on a machine (say ip is 10.107.105.13) with following details. inet addr : 10.107.105.13 Bcast : 10.107.111.255 Mask : 255.255.240.0 I can access my site on this computer by using firefox http://localhost/index.html. Now I am trying to access this site from another computer with following details inet addr : 10.14.42.7 Bcast : 10.14.42.255 Mask : 255.255.255.0 But it says 'access denied'. nmap 10.107.105.13 gives the following output. PORT STATE SERVICE 22/tcp open ssh 80/tcp open http 1234/tcp open hotline 3306/tcp open mysql 9418/tcp open git Following is the output of iptables -L -n -v on 10.107.105.13 141 11207 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 FORWARD and OUTPUT section empty. What is wrong with all this?

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• Can I use MX records to deliver some addresses to Google Apps and some to my server?

  - by Josh

  I have whm installed on my VPS, which my domain MX records are pointing to: 0:mail.mydomain.com and whm/cpanel has mail forwarding rules which pipes certain @mydomain email addresses into my CRM software. But for certain email addresses I want to forward into Google Apps. For example, [email protected], [email protected] pipes into cPanel -- CRM (mail.mydomain.com) but [email protected] should be going to Google MX records. Is that possible? The reason why is I want to register for Google Apps such as analytics and other Google services under [email protected]. My initial thoughts were to add a subdomain such as [email protected] and point that subdomain's MX records to Google.. but I want to avoid this if possible.

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• Forcing logon to Air Watch server upon joining wifi

  - by DKNUCKLES

  I'm setting up a wireless controller that I would like to leave as unsecured. When a user connects to this network they need to be forwarded to a specific page where they can authenticate with the Air Watch system they have in place. Once authentication takes place, a profile will be downloaded to their device and we can administer the devices accordingly. I'm mulling over how I can force the page to the user when they log in. The methodology I'm thinking about working with is creating a NAT rule for that VSC that would forward all port 80 and 443 traffic to the airwatch server. Once they authenticate, a profile will be downloaded which will connect the devices to an Virtual Access Point who's SSID isn't broadcasted. Is this methodology correct or can someone think of an easier / more efficient way of accomplishing this? The controller is an HP MSM720 for what it's worth.

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• Change my MX record on my server to google MX?

  - by Dejan.S

  Hi. I got a windows server 2008 where I host a site, now I decided to have the email on google apps. I did add the MX records I get from them to my DNS settings on the server but with no luck. I recently started doing server stuff so I did like this. Server Manager / Roles / DNS Server / DNS / SERVERNAME / MYDOMAIN / Forward Lookup / New MX Host or child domain: What goes here? FQDN: here is my domain name, i think because I named the ns my domain? FQDN MX: here is the google MX record I got from them MSP: 10 I have no Idea where I go wrong but I thought I would ask you guys if any of you can maybe give me some tips on what to look for or any newbee mistake I do that you see from this little info. I really appreciate all help I could get on this.

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• Debugging in XCode as root

  - by Anton

  In my program I need to create sockets and bind them to listen HTTP port (80). The program works fine when I launch it from command line with sudo, escalating permissions to root. Running under XCode gives a 'permission denied' error on the call to binding function (asio::ip::tcp::acceptor::bind()). How can I do debugging under XCode? All done in C++ and boost.asio on Mac OS X 10.5 with XCode 3.1.2.

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• Huawei b260a gsm modem not forwarding gre for pptp tunnel

  - by Priit

  I have a huawei gsm modem that does not want to let gre through. The goal is to connect into a pptp server thats behind the huawei. In the modems port forwarding settings theres a ready made profile for pptp (1723). After activating that the MS pptp test tools show that connection is being initiated but no gre packets make it to the server. After taking a closer look into the modems iptables rules theres nothing in there about gre. So I tried making gre rules manualy into forward and preroute chains without any success what so ever. As far as I can tell theres no ip_gre module present on the device is that needed for gre forwarding? Thats what I'm afraid of that it doesn't support gre in NAT but how would I turn it into a bridge? The wan interface is ppp0 so bridging it with eth0 would not work right? Is there some iptables rule I could use to make the modem let all the traffic just straight through?

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• Visitor and templated virtual methods

  - by Thomas Matthews

  In a typical implementation of the Visitor pattern, the class must account for all variations (descendants) of the base class. There are many instances where the same method content in the visitor is applied to the different methods. A templated virtual method would be ideal in this case, but for now, this is not allowed. So, can templated methods be used to resolve virtual methods of the parent class? Given (the foundation): struct Visitor_Base; // Forward declaration. struct Base { virtual accept_visitor(Visitor_Base& visitor) = 0; }; // More forward declarations struct Base_Int; struct Base_Long; struct Base_Short; struct Base_UInt; struct Base_ULong; struct Base_UShort; struct Visitor_Base { virtual void operator()(Base_Int& b) = 0; virtual void operator()(Base_Long& b) = 0; virtual void operator()(Base_Short& b) = 0; virtual void operator()(Base_UInt& b) = 0; virtual void operator()(Base_ULong& b) = 0; virtual void operator()(Base_UShort& b) = 0; }; struct Base_Int : public Base { void accept_visitor(Visitor_Base& visitor) { visitor(*this); } }; struct Base_Long : public Base { void accept_visitor(Visitor_Base& visitor) { visitor(*this); } }; struct Base_Short : public Base { void accept_visitor(Visitor_Base& visitor) { visitor(*this); } }; struct Base_UInt : public Base { void accept_visitor(Visitor_Base& visitor) { visitor(*this); } }; struct Base_ULong : public Base { void accept_visitor(Visitor_Base& visitor) { visitor(*this); } }; struct Base_UShort : public Base { void accept_visitor(Visitor_Base& visitor) { visitor(*this); } }; Now that the foundation is laid, here is where the kicker comes in (templated methods): struct Visitor_Cout : public Visitor { template <class Receiver> void operator() (Receiver& r) { std::cout << "Visitor_Cout method not implemented.\n"; } }; Intentionally, Visitor_Cout does not contain the keyword virtual in the method declaration. All the other attributes of the method signatures match the parent declaration (or perhaps specification). In the big picture, this design allows developers to implement common visitation functionality that differs only by the type of the target object (the object receiving the visit). The implementation above is my suggestion for alerts when the derived visitor implementation hasn't implement an optional method. Is this legal by the C++ specification? (I don't trust when some says that it works with compiler XXX. This is a question against the general language.)

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• SSL Certificate without host name in it

  - by Sinuhe

  I have implemented a web service with server and client authentication using keytool. The problem is that this authentication doesn't work if I don't include the name of the host in it. For example: keytool -genkey -alias myAlias -keyalg RSA -keypass myPassword -storepass myPassword -keystore my.keystore -dname "CN=myhost" But I don't need and I don't like validation by host or by IP. Is there any way of avoiding it? Thanks.

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• Booting off windows image through network

  - by Mr. Sir King Osman

  I have a HP st5742, which is a tower that does not have a hard drive and I am trying to boot it off the network, preferably off an image. It was designed along with the program HP Image Manager, however this program has been discontinued by HP and I can not seem to find a way to get a copy. If this helps, I am running my network with windows server 2008 R2 and would like the streaming client to be running windows. I have spent days searching for a way to deploy this machine however I can not seem to find a straight forward program, guide, or way to do this. I am new to this sort of thing but I willing to reading into the subject, all I need is a point in the right direction. Any help would be greatly appreciated.

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• Sonicwall site-to-site can not access remote network

  - by vpnwizard

  I have 2 SonicWall devices (tz100) in 2 different geographical locations. They are connected to each other using site-to-site vpn connection and this works just great. Device A network - 192.168.1.0/24 Device B network - 192.168.2.0/24 When I connect to one device, I can access, from my computer, anything on that specific subnet. However, I am unable to view anything, from my computer, on the other network. Is there a setting somewhere that will forward my requests to the other subnet? Example - I VPN into Device A, but would like to get to a server which is on the Device B network (192.168.2.0/24)

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• svnserve accepts only local connection

  - by stiv

  I've installed svnserve in linux box konrad. On konrad I can checkout from svn: steve@konrad:~$ svn co svn://konrad A konrad/build.xml On my local Windows pc i can ping konrad, but checkout doesn work: C:\Projects>svn co svn://konrad svn: E730061: Unable to connect to a repository at URL 'svn://konrad' svn: E730061: Can't connect to host 'konrad': ??????????? ?? ???????????, ?.?. ???????? ????????? ?????? ?????? ?? ???????????. My linux firewall is disabled: konrad# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination and windows firewall is also off (I can't send screen shot here, so believe me). How can I fix that? Any ideas?

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• .NET get timezone by city

  - by Daniil Harik

  Hello, I'm using .NET and I'm able to geolocate user city by IP. I was wondering is there easy way to get user timezone by long. and lang. or city name. Thank You

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• Routing only some local IPs through VPN on dd-wrt

  - by bo-inge-ostberg

  Much similar to this entry: http://serverfault.com/questions/94283/using-dd-wrt-to-connect-to-vpn-and-forward-all-traffic-of-certain-devices-through , I have set up my router with dd-wrt + OpenVPN to connect to a VPN. This works fine, and all traffic from behind the router goes through the VPN. How do I route(?) traffic in the router so that only certain IPs from the LAN will go through the VPN, while the others take the "normal" route? Is it also possible to allow traffic from certain local IPs to go ONLY through the VPN, making it impossible for them to use the regular internet connection if the VPN is down? I know this question was answered in the post I linked to, but that just doesn't seem to work for me. The routing table and rules change, but traffic still just goes through the VPN.

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• Explanation of WCF application life cycle in IIS 6 hosting environment.

  - by David Christiansen

  Hi all and thanks for reading, I have a delay issue where my application takes a long time to start up when first called after an determinate period since the last call. The web application is a WCF service and we are talking about a delay of ~18seconds before the actual processing starts. Now, I believe I know how to reduce this delay so that is not my question (it's more a stackoverflow deal anyway) My question is, Can anyone explain to me why is it that despite me disabling worker process shutdown, and worker process recycling the application still 'winds down' after a indeterminate period of time of inactivity? To understand this I need to know more about the innerworkings of WCF services hosted in IIS. I fully expect there to be a straight forward answer to this. Thank you v. much for any help you may offer, DC

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• What is "Either the application has not called WSAStartup, or WSAStartup failed"

  - by Am1rr3zA

  I develop a program which connect to a web-server through network every thing works fine until I try to use some dongle to protect my software. the dongle has network feature too and it's API work under network infrastructure. when I added the Dongle checking code to my program I got this error: "Either the application has not called WSAStartup, or WSAStartup failed" I don't have any idea what is going on? I put the block of code which encounter exception here. the scenario I got the exception is I log in to the program (everything works fine) the plug out the dongle then the program stop and ask for dongle and I plug in the dongle again and try to log in bu I got exception on line response = (HttpWebResponse)request.GetResponse(); DongleService unikey = new DongleService(); checkDongle = unikey.isConnectedNow(); if (checkDongle) { isPass = true; this.username = txtbxUser.Text; this.pass = txtbxPass.Text; this.IP = combobxServer.Text; string uri = @"https://" + combobxServer.Text + ":5002num_events=1"; request = (HttpWebRequest)WebRequest.Create(uri); request.Proxy = null; request.Credentials = new NetworkCredential(this.username, this.pass); ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true); response = (HttpWebResponse)request.GetResponse(); Properties.Settings.Default.User = txtbxUser.Text; int index = _servers.FindIndex(p => p == combobxServer.Text); if (index == -1) { _servers.Add(combobxServer.Text); Config_Save.SaveServers(_servers); _servers = Config_Save.LoadServers(); } Properties.Settings.Default.Server = combobxServer.Text; // also save the password if (checkBox1.CheckState.ToString() == "Checked") Properties.Settings.Default.Pass = txtbxPass.Text; Properties.Settings.Default.settingLoginUsername = this.username; Properties.Settings.Default.settingLoginPassword = this.pass; Properties.Settings.Default.settingLoginPort = "5002"; Properties.Settings.Default.settingLoginIP = this.IP; Properties.Settings.Default.isLogin = "guest"; Properties.Settings.Default.Save(); response.Close(); request.Abort(); this.isPass = true; this.Close(); } else { MessageBox.Show("Please Insert Correct Dongle!", "Dongle Error", MessageBoxButtons.OK, MessageBoxIcon.Stop); }

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• git svn on multiple machines

  - by stgtscc

  My repo is SVN and I'm using git-svn to interface with it which has been working out well. I'm working on the code base from a few different machines and appreciate some insight as to what the best setup might be for me going forward. I'd like to use git primarily but I need to commit to svn (via git svn dcommit) and pull from svn (git svn rebase) periodically from potentially any of the machines. Is it possible to perhaps have git svn setup on all but somehow push and pull changes between the instances? Or should I setup a bare repo and use that as the central git repo? How would that tie in to git svn? Any insight is appreciated.

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• My Windows 8 computer does not come out of Standby

  - by Jikag

  My computer will not come out out of standby. It has had this issue ever since I bought it ~4 years ago. When I purchased it, It came with Vista, I have since upgraded it to 7 and now 8 Pro, each time hoping that it would fix the problem, each time finding that it did not. My computer is an HP Pavilion Model #: m9500y. The computer goes into standby, but does not come out of it properly. If Hybrid sleep in on, it does not respond at all. If Hybrid sleep is off, It comes out and I can see the desktop for a bit, but then the screen goes black again and I have to reboot. I have tried Running a sfc, and a chkdsk in case it's a corrupted file, but it hasn't helped. This isn't too serious an issue because I can just shutdown my computer and turn it on the old fashioned way, but it is annoying and I would appreciate some advice going forward as I'm currently stumped.

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• Agile sysadmin and devops - How to accomplish?

  - by Marco Ramos

  Nowadays, agile systems adminitration and devops are some of the most trending topics regarding systems administration and operations. Both these concepts are mainly focused on bridging the gap between operations/sysadmins and the projects (developers, business, etc). Even if you never heard of the devops concept, I'm sure that this topic is your concern too. So, what tools and techniques do you use to accomplish devops in you companies? I'm particularly interested in topics like change management, continous integration and automatization, but not only. Please share your thoughts. I'm looking forward to read your answers/opinions :)

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• Remote Desktop connection repeatedly aborting

  - by DerKlaus

  I connect to my workplace computer using Remote Desktop. After 1-2 minutes the application freezes to tell me after one more minute that the connection was aborted. It then reconnects. Everything works again for 1-2 minutes. Then the process repeats. Probably Forever. My coworkers do not experience such problems when connecting to the workplace. My workplace computer: Windows 7 32bit My home computer: Windows 7 64bit connected to the internet via WLAN-router with integrated ADSL modem (Linksys WAG200G) Things I already tried to fix the problem: disabled the Windows firewall disabled the other firewall reduced the MTU upgraded the firmware on the router configured port-forwarding to forward all packets to my home computer The problem remains unchanged. What could be the cause of the connection aborts? What else can I try to fix the connection? Thanks in advance.

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• Complex error handling

  - by Caspin

  I've got a particularly ornery piece of network code. I'm using asio but that really doesn't matter for this question. I assume there is no way to unbind a socket other than closing it. The problem is that open(), bind(), and listen() can all throw a system_error. So I handled the code with a simple try/catch. The code as written in broken. using namespace boost::asio; class Thing { public: ip::tcp::endpoint m_address; ip::tcp::acceptor m_acceptor; /// connect should handle all of its exceptions internally. bool connect() { try { m_acceptor.open( m_address.protocol() ); m_acceptor.set_option( tcp::acceptor::reuse_address(true) ); m_acceptor.bind( m_address ); m_acceptor.listen(); m_acceptor.async_accept( /*stuff*/ ); } catch( const boost::system::system_error& error ) { assert(acceptor.is_open()); m_acceptor.close(); return false; } return true; } /// don't call disconnect unless connect previously succeeded. void disconnect() { // other stuff needed to disconnect is ommited m_acceptor.close(); } }; The error is if the socket fails to connect it will try to close it in the catch block and throw another system_error about closing an acceptor that has never been opened. One solution is to add an if( acceptor.is_open() ) in the catch block but that tastes wrong. Kinda like mixing C-style error checking with c++ exceptions. If I where to go that route, I may as well use the non-throwing version of open(). boost::system::error_code error; acceptor.open( address.protocol, error ); if( ! error ) { try { acceptor.set_option( tcp::acceptor::reuse_address(true) ); acceptor.bind( address ); acceptor.listen(); acceptor.async_accept( /*stuff*/ ); } catch( const boost::system::system_error& error ) { assert(acceptor.is_open()); acceptor.close(); return false; } } return !error; Is there an elegant way to handle these possible exceptions using RAII and try/catch blocks? Am I just wrong headed in trying to avoid if( error condition ) style error handling when using exceptions?

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