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• Windows Server 2008 R2 Firewall - Interface specific rules

  - by Mehmet Ergut

  I'm trying to define per interface rules, much like it was in Server 2003. We will be replacing our old 2003 server with a new 2008 R2 server. The server runs IIS and SQL Server. It's a dedicated server at the hosting company. We use a OpenVPN connection from the office to access SQL server, RDesktop, FTP and other administrative services. Only http and ssh is listening on the public interface. On the old server running 2003, I was able to define global rules for http and ssh, and allow other services only on the vpn interface. I can't find a way to do the same on 2008 R2. I understand that there is the Network Location Awareness service, firewall rules are applied according to the current network location. But I don't understand the purpose of this on a server. The only close solution I found is to set the scope on the firewall rule and restrict remote ip addresses to the private subnet of the office. But the ports will still be listening on the public interface. So how can I restrict a firewall rule to the connections coming from the vpn interface ? A note on this page states that scoping a rule to an interface does not exist anymore: In earlier versions of Windows, many of these command accepted a parameter called interface. This parameter is not supported in the firewall context in Windows Vista or later versions of Windows. I can't believe that they simply decided to remove a core firewall functionality that every firewall has. There must be a way to restrict a rule to an interface. Any ideas ? I'm still unable to find an adequate solution to my problem. So for now, my workaround is this: Administrative services listen on VPN IP address Firewall rules restrict the scope to the local IP address of VPN Public services listen on all interfaces, no scope restriction on firewall rules This is not optimal, if I change the IP address of the VPN, I need to edit the firewall rules too. It won't be the case if the rules were bound to the interface.

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• After Upgrading Ubuntu to 9.10 my hard drive now has a warning.

  - by Sean

  it is a 500gb hard drive format as ext3 path /dev/sdc1 The disk utility does not even see this. This Warning is from gparted: e2label: No such device or address while trying to open /dev/sdc1 Couldn't find valid filesystem superblock. Couldn't find valid filesystem superblock. dump2fs 1.41.9 (22-Aug-2009) dumpe2fs: No such device or address while trying to open /dev/sdc1 Unable to read contents of this file system? Because of this some operations may be unavailable. END OF ERROR MESSAGE Did I lose something during the upgrade of the system? Was it the hard drive or the Ubuntu system that went bad?

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• How to port forward https traffic via ssh and/or remote desktop to through several networks and PCs?

  - by donttellya

  I have the following environment: In company X I develop a application on a pc A in network A with ip address 192.168.100.50 which has to do an https request to an http server located in the intranet of company Y In company X is another pc B in network B with ip address 192.168.200.100 pc B (of company X) can access the intranet from company Y via ssh tunnel (putty) pc A (of company X) can ping pc B (of company X) note: pc A can also do a remote desktop connection to pc B) pc B can ping the http sever pc A can not ping the http server How can the https request from pc A of company X get to the http server of company Y? On which pc must be putty configured? And which settings for host, port forwarding etc. has to be done in putty? So finally the https request should go from PC A - PC B - Http Server in company Y.

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• Cannot Enter Repro Admin Web Interface at Port 5080

  - by aqua

  I have followed the instructions on this website www.rtcquickstart.org to set up my firewall, DNS settings, TLS, and have installed the TURN server and repro proxy as instructed, and have restarted repro. However, I am not able to access the web interface of repro on port 5080, either at localhost:5080 / 127.0.0.1:5080 or at the server's IP address: IPADDRESS:5080 (I have set the server's IP for binding in repro.config). I get the browser error message: 'Unable to connect to server' whenever trying to connect to the web interface via port 5080. I initially had Apache2 installed, which loaded pages correctly at port 80 / address root, and when checked it 'listened' at port 5080 after it was configured in /etc/apache2/ports.conf, however the repro web interface still did not work at port 5080. I have tried uninstalling Apache2 in case that was conflicting with repro's web server, but the problem persists, and testing port 5080 now shows that nothing is 'listening' on port 5080. I have tried reinstalling / purging repro but it has not helped. My router is correctly set to allow all ports; port 5080 is open and forwarding correctly. I can connect to the internet and ping all websites through the server and everything else is working correctly. I would be gateful if anyone could offer advice on how to solve this problem.

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• Why do I get an exception when playing multiple sound instances?

  - by Boreal

  Right now, I'm adding a rudimentary sound engine to my game. So far, I am able to load in a WAV file and play it once, then free up the memory when I close the game. However, the game crashes with a nice ArgumentOutOfBoundsException when I try to play another sound instance. Specified argument was out of the range of valid values. Parameter name: readLength I'm following this tutorial pretty much exactly, but I still keep getting the aforementioned error. Here's my sound-related code. /// <summary> /// Manages all sound instances. /// </summary> public static class Audio { static XAudio2 device; static MasteringVoice master; static List<SoundInstance> instances; /// <summary> /// The XAudio2 device. /// </summary> internal static XAudio2 Device { get { return device; } } /// <summary> /// Initializes the audio device and master track. /// </summary> internal static void Initialize() { device = new XAudio2(); master = new MasteringVoice(device); instances = new List<SoundInstance>(); } /// <summary> /// Releases all XA2 resources. /// </summary> internal static void Shutdown() { foreach(SoundInstance i in instances) i.Dispose(); master.Dispose(); device.Dispose(); } /// <summary> /// Registers a sound instance with the system. /// </summary> /// <param name="instance">Sound instance</param> internal static void AddInstance(SoundInstance instance) { instances.Add(instance); } /// <summary> /// Disposes any sound instance that has stopped playing. /// </summary> internal static void Update() { List<SoundInstance> temp = new List<SoundInstance>(instances); foreach(SoundInstance i in temp) if(!i.Playing) { i.Dispose(); instances.Remove(i); } } } /// <summary> /// Loads sounds from various files. /// </summary> internal class SoundLoader { /// <summary> /// Loads a .wav sound file. /// </summary> /// <param name="format">The decoded format will be sent here</param> /// <param name="buffer">The data will be sent here</param> /// <param name="soundName">The path to the WAV file</param> internal static void LoadWAV(out WaveFormat format, out AudioBuffer buffer, string soundName) { WaveStream wave = new WaveStream(soundName); format = wave.Format; buffer = new AudioBuffer(); buffer.AudioData = wave; buffer.AudioBytes = (int)wave.Length; buffer.Flags = BufferFlags.EndOfStream; } } /// <summary> /// Manages the data for a single sound. /// </summary> public class Sound : IAsset { WaveFormat format; AudioBuffer buffer; /// <summary> /// Loads a sound from a file. /// </summary> /// <param name="soundName">The path to the sound file</param> /// <returns>Whether the sound loaded successfully</returns> public bool Load(string soundName) { if(soundName.EndsWith(".wav")) SoundLoader.LoadWAV(out format, out buffer, soundName); else return false; return true; } /// <summary> /// Plays the sound. /// </summary> public void Play() { Audio.AddInstance(new SoundInstance(format, buffer)); } /// <summary> /// Unloads the sound from memory. /// </summary> public void Unload() { buffer.Dispose(); } } /// <summary> /// Manages a single sound instance. /// </summary> public class SoundInstance { SourceVoice source; bool playing; /// <summary> /// Whether the sound is currently playing. /// </summary> public bool Playing { get { return playing; } } /// <summary> /// Starts a new instance of a sound. /// </summary> /// <param name="format">Format of the sound</param> /// <param name="buffer">Buffer holding sound data</param> internal SoundInstance(WaveFormat format, AudioBuffer buffer) { source = new SourceVoice(Audio.Device, format); source.BufferEnd += (s, e) => playing = false; source.Start(); source.SubmitSourceBuffer(buffer); // THIS IS WHERE THE EXCEPTION IS THROWN playing = true; } /// <summary> /// Releases memory used by the instance. /// </summary> internal void Dispose() { source.Dispose(); } } The exception occurs on line 156 when I am playing the sound: source.SubmitSourceBuffer(buffer);

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• "Time Control" in a 2d Platformer

  - by Woody Zantzinger

  I am making a 2d platformer where the player can press a button, and restart the level, only their previous character will also run the level at the same time, like they are traveling back in time. I know other games have done this before, and the way I have thought of doing it is to make the game character have a set of actions (Idle, Jumping, Walking Left etc.) and then detect changes in those actions and log them into a list along with the game time. So then when I need the character to run the level again on its own, I can just go through the list changing its actions at the right time. Is this the best way to do it? Does anyone have any experience in this? Thanks.

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• Hiding a HTTP Auth-Realm by sending 404 to non-known IPs?

  - by zhenech

  I have an Apache (2.2) serving a web-app on example.com. That web-app has a debug-page reachable via example.com/debug. /debug is currently protected with a HTTP basic auth. As there is only a very small user-base who has access to the debug-page, I would like to hide it based on IP address and return 404 to clients not accessing from our VPN. Serving a 404 based on IP-address only is easy and is described in http://serverfault.com/a/13071. But as soon I add authentication, the users see a 401 instead of a 404. Basically, what I need is: if ($REMOTE_ADDR ~ 10.11.12.*): do_basic_auth (aka return 401) else: return 404

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• Set a custom favicon locally, that carries across the entire site.

  - by Iszi

  Is there a way to add a custom favicon to an App Tab? In the above thread, @admintech links to a great plugin for changing favicons which covers both the bookmarks folder and the address bar/tab bar icons. However, it still does not quite fully address what I was hoping to accomplish. I'd like to set an App Tab that has a customized icon, that stays the same in that tab no matter what I do there. Since the navigation within an App Tab is very restricted, the chosen favicon should always be relevant to whatever page is loaded in that tab. The Bookmark Favicon Changer has been effective in allowing me to use a custom favicon in the App Tab. But, the favicon only applies to the specific URL that was bookmarked. Any navigation done from that page will return the favicon to blank. Is there another plugin, or perhaps some special tweak to this plugin or the bookmark itself, that will allow me to make the favicon more persistent across the site?

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• Failed to start up after upgrading software in ubuntu 10.10

  - by Landy

  I've been running Ubuntu 10.10 in a physical x86-64 machine. Today Update Manager reminded me that there are some updates to install and I confirmed the action. I should had read the update list but I didn't. I can only remember there is an update about cups. After the upgrading, Update Manager requires a restart and I confirmed too. But after the restart, the computer can't start up. There are errors in the console. Begin: Running /scripts/init-premount ... done. Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done. [xxx]usb 1-8: new high speed USB device using ehci_hcd and address 3 [xxx]usb 2-1: new full speed USB device using ohci_hcd and address 2 [xxx]hub 2-1:1.0: USB hub found [xxx]hub 2-1:1.0: 4 ports detected [xxx]usb 2-1.1: new low speed USB device using ohci_hcd and address 3 Gave up waiting for root device. Common probles: - Boot args (cat /proc/cmdline) - Check rootdelay=(did the system wait long enough) - Check root= (did the system wait for the right device?) - Missing modules (cat /proc/modules; ls /dev) FATAL: Could not load /lib/modules/2.6.35-22-generic/modules.dep: No such file or directory FATAL: Could not load /lib/modules/2.6.35-22-generic/modules.dep: No such file or directory ALERT! /dev/sda1 does not exist. Dropping to a shell! BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell(ash) Enter 'help' for a list of built-in commands. (initramfs)[cursor is here] At the moment, I can't input anything in the console. The keyboard doesn't work at all. What's wrong? How can I check boot args or "root=" as suggested? How can I fix this issue? Thanks. =============== PS1: the /dev/sda1 is type ext4 (rw,nosuid,nodev) PS2: the /dev/sda1 can be mounted and accessed successfully under SUSE 11 SP1 x64.

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• I want to start my portfolio site using ASP.Net and I'm a bit lost about hwo to actually put it on t

  - by Papuccino1

  I found this site: www.discountasp.net They seem cheap enough and have a track record. I decided to host my site with them. Here's where I'm confused. I host the application (my website) with them and they give me an IP address, right? Users can visit my site by typing in that IP address right? (Of course once I move the index file and create a defauly web folder, etc.) Next step is buying a domain name right? Like www.mysite.com, right? Is this the way it's done, or am I doing it wrong?

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• How to get rid of NAT in a LAN?

  - by Alberto

  Currently the LAN I manage is organized as follows: internal network (192.168.1.0) which uses a Linux server as a gateway (internal address on interface br0 192.168.1.1, external address on interface br1 10.0.0.2) through NAT; then the 10.0.0.0 network has another gateway (10.0.0.1) which through another NAT connects the whole thing to the internet. What I would like to achieve is to configure the Linux server so that the first layer of NAT is no more necessary, so that for example a computer in the 10.0.0.0 network can ping every computer in the 192.168.1.0 network. I deleted this iptables rule: iptables -t nat -A POSTROUTING -o br1 -j SNAT --to-source 10.0.0.2, but of course now computers on 192.168.1.0 cannot reach the internet; ip forwarding is of course enabled. What's missing here? Thanks

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• How do I deal with content scrapers? [closed]

  - by aem

  Possible Duplicate: How to protect SHTML pages from crawlers/spiders/scrapers? My Heroku (Bamboo) app has been getting a bunch of hits from a scraper identifying itself as GSLFBot. Googling for that name produces various results of people who've concluded that it doesn't respect robots.txt (eg, http://www.0sw.com/archives/96). I'm considering updating my app to have a list of banned user-agents, and serving all requests from those user-agents a 400 or similar and adding GSLFBot to that list. Is that an effective technique, and if not what should I do instead? (As a side note, it seems weird to have an abusive scraper with a distinctive user-agent.)

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• Remote Access to Owncloud Server

  - by John

  I'm currently trying to setup my own own-cloud server, and I've got it fully installed, configured, and accessible from within my own local network. I cannot figure out how to access it from the outside. So far I've: Successfully setup port-forwarding on my local router. I've done so via 'single port forwarding' and 'port range forwarding' Ports 80, 443, 3306 (Apache-Full and MySQL) Successfully obtained my external IP address. I've also tested this magic number from within the network at #insertIPhere/owncloud and it did work. Successfully setup the server using SQLite Successfully setup the server using MySQL Created the following exceptions in my firewall: Allow In Port 80 (Apache Full) Allow In Port 443 (Apache Full) Allow In Port 3306 (MySQL) Tried connecting from several different remote networks, as to troubleshoot something on their end As far as trying to access it, I'm doing so through Google-Chrome and Mozilla Firefox trying to reach the server through #insertIPhere/owncloud using the above public IP address. So what have I missed, and how do I access my server from outside? Thanks in advance for your help and time, and I apologize in advance for what will probably result in my noobish mistake in networking. I've looked at the official documentation. And also this question here.

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• SPF record doesn't work (not sure which DNS server to tweak)

  - by Ion

  Problem: Google (and perhaps others) marks our emails as SPF neutral. Let me give you some background about the setup: initially got a dedicated server (Hetzner) with Plesk installed to host a domain/web application, let's say: bigjaws.com. Plesk automatically creates a DNS zone for it with some records for the various services it provides out of the box, e.g. webmail.bigjaws.com as a CNAME to bigjaws.com to provide Horde/whatever, etc. Let me point out four relevant of these records (where XXX.XXX.XXX.158 is our dedicated IP): bigjaws.com. A XXX.XXX.XXX.158 mail.bigjaws.com. A XXX.XXX.XXX.158 bigjaws.com MX (10) mail.bigjaws.com. bigjaws.com. TXT v=spf1 +a +mx -all The above records are not(?) valid anymore though, because after using this dedicated server for a while, our site got bigger and bigger so we decided to move our operations over to AWS (EC2, RDS, ELB, etc), but we retained the mail functionality as is, i.e. emails from [email protected] are sent by connecting to our dedicated server where Plesk takes care of things. This was decided in order not to setup anything from scratch. Of course for all DNS-related things we now use Route53. In Route53 I have the following records: mail.schoox.com. A XXX.XXX.XXX.158 bigjaws.com. MX (10) mail.bigjaws.com bigjaws.com. SPF "v=spf1 +ip4:XXX.XXX.XXX.158 +mx ~all" From my understanding of SPF, the SPF status should have been passed: I designate that all email being sent by bigjaws.com from XXX.XXX.XXX.158 are valid/not spam (I added +mx there but I'm not sure if needed). When a mail server receives an email, doesn't it lookup the SPF record of the domain and checks against the IP it got the email from? Checking with spfquery: root@box:~# spfquery -ip XXX.XXX.XXX.158 -sender [email protected] -rcpt-to [email protected] StartError Context: Failed to query MAIL-FROM ErrorCode: (2) Could not find a valid SPF record Error: No DNS data for 'bigjaws.com'. EndError noneneutral Please see http://www.openspf.org/Why?id=employee1%40bigjaws.com&ip=XXX.XXX.XXX.158&receiver=spfquery : Reason: default spfquery: XXX.XXX.XXX.158 is neither permitted nor denied by domain of bigjaws.com Received-SPF: neutral (spfquery: XXX.XXX.XXX.158 is neither permitted nor denied by domain of bigjaws.com) client-ip=XXX.XXX.XXX.158; [email protected]; If I go to the address listed above (openspf.org) it tells me that the message should have been accepted(!): spfquery rejected a message that claimed an envelope sender address of [email protected]. spfquery received a message from static.158.XXX.XXX.XXX.clients.your-server.de (XXX.XXX.XXX.158) that claimed an envelope sender address of [email protected]. The domain bigjaws.com has authorized static.158.XXX.XXX.XXX.clients.your-server.de (XXX.XXX.XXX.158) to send mail on its behalf, so the message should have been accepted. It is impossible for us to say why it was rejected. What should I do? If the problem persists, contact the bigjaws.com postmaster. Also, here are some headers from an email sent by one of our [email protected] addresses to a gmail.com address (by the way, bigjaws.de listed in the "Received: from" field was the initial domain hosted on the dedicated server before adding the .com one -- both are still listed as separate subscriptions under Plesk). Delivered-To: [email protected] Received: by 10.14.177.70 with SMTP id c46csp289656eem; Wed, 23 Oct 2013 01:11:00 -0700 (PDT) X-Received: by 10.14.102.66 with SMTP id c42mr306186eeg.47.1382515860386; Wed, 23 Oct 2013 01:11:00 -0700 (PDT) Return-Path: <[email protected]> Received: from bigjaws.de (static.158.XXX.XXX.XXX.clients.your-server.de. [XXX.XXX.XXX.158]) by mx.google.com with ESMTPS id l4si19438578eew.161.2013.10.23.01.10.59 for <[email protected]> (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 23 Oct 2013 01:10:59 -0700 (PDT) Received-SPF: neutral (google.com: XXX.XXX.XXX.158 is neither permitted nor denied by best guess record for domain of [email protected]) client-ip=XXX.XXX.XXX.158; Authentication-Results: mx.google.com; spf=neutral (google.com: XXX.XXX.XXX.158 is neither permitted nor denied by best guess record for domain of [email protected]) [email protected] DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=bigjaws.com; b=WwRAS0WKjp9lO17iMluYPXOHzqRcOueiQT4rPdvy3WFf0QzoXiy6rLfxU/Ra53jL1vlPbwlLNa5gjoJBi7ZwKfUcvs3s02hJI7b3ozl0fEgJtTPKoCfnwl4bLPbtXNFu; h=Received:Received:Message-ID:Date:From:User-Agent:MIME-Version:To:Subject:Content-Type:Content-Transfer-Encoding; Received: (qmail 22722 invoked from network); 23 Oct 2013 10:10:59 +0200 Received: from hostname.static.ISP.com (HELO ?192.168.1.60?) (YYY.YYY.ISP.IP) by static.158.XXX.XXX.XXX.clients.your-server.de. with ESMTPSA (DHE-RSA-AES256-SHA encrypted, authenticated); 23 Oct 2013 10:10:59 +0200 Message-ID: <[email protected]> Date: Wed, 23 Oct 2013 11:11:00 +0300 From: BigJaws Employee <[email protected]> User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 MIME-Version: 1.0 To: [email protected] Subject: test SPF Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit test SPF Any ideas why SPF is not working correctly? Also, are there any DNS settings that are not needed anymore and create a problem?

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• Find Nearest Object

  - by ultifinitus

  I have a fairly sizable game engine created, and I'm adding some needed features, such as this, how do I find the nearest object from a list of points? In this case, I could simply use the Pythagorean theorem to find the distance, and check the results. I know I can't simply add x and y, because that's the distance to the object, if you only took right angle turns. However I'm wondering if there's something else I could do? I also have a collision system, where essentially I turn objects into smaller objects on a smaller grid, kind of like a minimap, and only if objects exist in the same gridspace do I check for collisions, I could do the same thing, only make the gridspace larger to check for closeness. (rather than checking every. single. object) however that would take additional setup in my base class and clutter up the already cluttered object. TL;DR Question: Is there something efficient and accurate that I can use to detect which object is closest, based on a list of points and sizes?

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• How to access remotly to a mysql server?

  - by ÉricP

  Hi, I'm trying to access my remote mysql server from my own computer. I uncommented: bind-address = 80.10.65.45 I added 80.10.65.45 as a server in privilege root 80.10.65.45 yes ALL PRIVILEGES yes I'm using Sequel Pro on MacosX to connect via SSH here is the debug log: debug1: Authentication succeeded (password). debug1: Local connections to LOCALHOST:58517 forwarded to remote address 127.0.0.1:3306 debug1: Local forwarding listening on ::1 port 58517. debug1: channel 0: new [port listener] debug1: Local forwarding listening on 127.0.0.1 port 58517. debug1: channel 1: new [port listener] debug1: Entering interactive session. debug1: Connection to port 58517 forwarding to 127.0.0.1 port 3306 requested. debug1: channel 2: new [direct-tcpip] channel 2: open failed: connect failed: Connection refused debug1: channel 2: free: direct-tcpip: listening port 58517 for 127.0.0.1 port 3306, connect from 127.0.0.1 port 58519, nchannels 3

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• would a composite design pattern be useful for group membership?

  - by changokun

  I'm trying to think about the best way to handle group memberships on a website. People sign up and select checkboxes in a list of interests. Every week we send out interest-themed emails to those members that indicated that interest. however i store the information in the database, while i am working with the lists and generating lists of email addresses or manipulating group memberships, the composite design pattern looked interesting. it would be easy to populate the group, then do some aggregating functions that say... generate the list of email addresses based on the interests. but i'm not sure i'm seeing any other advantages. i do need something scalable, and flexible. thoughts?

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• Server problem (duh)

  - by j-t-s

  Sorry the title couldn't be more specific. I installed Abyss Web Server. I'm running Windows XP Home Edition and I have Wireless Mobile Broadband internet. I used to be able to access (and other people on other networks) my site by entering my ip address in the browser, but after I formatted, and the installed abyss web server again, this does not work anymore. There are no errors. I CAN visit my own site by entering my ip address BUT anybody else can't do the same, it just says "connecting" in the browser's statusbar and it never changes. I have consulted the docs and have found no help. Google hasn't helped with this problem either. Can somebody please help? Thank you :)

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• Server problem (duh)

  - by j-t-s

  Sorry the title couldn't be more specific. I installed Abyss Web Server. I'm running Windows XP Home Edition and I have Wireless Mobile Broadband internet. I used to be able to access (and other people on other networks) my site by entering my ip address in the browser, but after I formatted, and the installed abyss web server again, this does not work anymore. There are no errors. I CAN visit my own site by entering my ip address BUT anybody else can't do the same, it just says "connecting" in the browser's statusbar and it never changes. I have consulted the docs and have found no help. Google hasn't helped with this problem either. Can somebody please help? Thank you :)

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• Windows doesn't get access to internet though linux easily does

  - by flashnik

  We have a very interesting problem. The network is configured in this way: internet is connected to Trendnet switch TS DHCP server at 192.168.0.1 running on Ubuntu (S) is connected to internet switch DNS is also configured on 192.168.0.1 on S D-Link Wi-Fi boosters are connected to switch TS PCs use D-Link PCI-E Wi-Fi cards to get access to network PCs have both Ubuntu and Windows 7 There are about 40 PCs. When PC is booted to Ubuntu it easily gets access to internet. But when it's booted to Windows 7, it gets a valid IP-address, but doesn't get access to internet. The address, mask, DNS, GW-address are totally the same as when it's booted under Ubuntu. The S is reacheble and pingable. Sometimes when we are lucky the PC gets access to Internet, but after rebooting it can lose it. When PC under Windows has access, it has totally the same settings as when it doesn't. What can be done? UPDATE I shared a dropbox with 2 captures of traffic. Ping.pcap is a capture of pinging 8.8.8.8. And google-browser.pcap is a capture of opening a google.com in a browser, both of them are in tcpdump formats and made by Wireshark on Win PC. The MAC of Win PC ends on b7:63 and IP is 192.168.0.130. UPDATE2 This is ifconfig output from Ubuntu Server eth0 Link encap:Ethernet HWaddr 00:1e:67:13:d5:8d inet addr:193.200.211.74 Bcast:193.200.211.78 Mask:255.255.255.0 inet6 addr: fe80::21e:67ff:fe13:d58d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:196284 errors:0 dropped:44 overruns:0 frame:0 TX packets:190682 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:158032255 (158.0 MB) TX bytes:156441225 (156.4 MB) Interrupt:19 Memory:c1400000-c1420000 eth0:2 Link encap:Ethernet HWaddr 00:1e:67:13:d5:8d inet addr:192.168.0.1 Bcast:192.168.0.254 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:19 Memory:c1400000-c1420000 eth1 Link encap:Ethernet HWaddr 00:1e:67:13:d5:8c UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:16 Memory:c1300000-c1320000 nslookup from Win results in DNS request timeout, nbtstat in 'not found'.

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• SSH connection falling down

  - by kappa

  I've set up a connection with autossh that creates some tunnels at system startup, but if I try to connect, after successful login (with RSA key) connection fall down, here a trace: debug1: Authentication succeeded (publickey). debug1: Remote connections from LOCALHOST:5006 forwarded to local address localhost:22 debug1: Remote connections from LOCALHOST:6006 forwarded to local address localhost:80 debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: remote forward success for: listen 5006, connect localhost:22 debug1: remote forward success for: listen 6006, connect localhost:80 debug1: All remote forwarding requests processed debug1: Sending environment. debug1: Sending env LANG = it_IT.UTF-8 debug1: Sending env LC_CTYPE = en_US.UTF-8 debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: client_input_channel_req: channel 0 rtype [email protected] reply 0 debug1: channel 0: free: client-session, nchannels 1 Transferred: sent 2400, received 2312 bytes, in 1.3 seconds Bytes per second: sent 1904.2, received 1834.4 debug1: Exit status 1 What can be the problem? All this stuff is managed by a script already running on another machine (creating reverse tunnels on the same machine but with different ports)

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• httpd (no pid file) not running while restarting apache

  - by user59503

  Hi I am working on ubuntu. I got the error messages while try to restart apache. root@XXX:/etc/init.d# sudo /etc/init.d/apache2 restart * Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName httpd (no pid file) not running apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs I got the following message when tried netstat -pant tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 0 32748 9950/httpd tcp 429 0 xxx.xxx.xx.xxx:80 xxx.xxx.xx.xxx:xxxxx CLOSE_WAIT 0 0

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• How should I troubleshoot a problematic wireless connection on Linux?

  - by Gearoid Murphy

  I recently purchased a netgear 150 usb wireless dongle for use with my 11.10 Xubuntu amd64 system. Using the network-manager interface, I can see local wireless networks and enter the authentication details for my local wireless lan. Unfortunately, the connection does not seem to work, I keep getting notifications that my wireless has disconnected (but none indicating that I've connected). When I examine syslog, it seems to indicate that I've successfully associated with the wireless switch and that dhcp has successfully acquired an ip address but the log shows that the dhcp process keeps sending requests, eventually dropping the connection. 'ifconfig wlan0' never shows the dhcp address logged in syslog. I suspect that the problem lies with the usb dongle, my configuration or the wireless switch but I am not certain how to isolate the problem, can anyone provide some insight on how I should go about homing in on the cause of this problem or verifying the functionality of the individual components, thanks.

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• Add References with Search

  - by Daniel Cazzulino

  If you have been using VS2010 for any significant amount of time, you surely came across the awkward, slow and hard to use Add Reference dialog. Despite some (apparent) improvements over the VS2008 behavior, in its current form it's even LESS usable than before. A brief non-exhaustive summary of the typical grief with this dialog is: Scrolling a list of *hundreds* of entries? (300+ typically) No partial matching when typing: yes, you can type in the list to get to the desired entry, but the matching is performed in an exact manner, from the beginning of the assembly name. So, to get to the (say) "Microsoft.VisualStudio.Settings" assembly, you actually have to type the first two segments in their entirety before starting to type "Settings"....Read full article

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• Proxied calls not working as expected

  - by AndyH

  I have been modifying an application to have a cleaner client/server split to allow for load splitting and resource sharing etc. Everything is written to an interface so it was easy to add a remoting layer to the interface using a proxy. Everything worked fine. The next phase was to add a caching layer to the interface and again this worked fine and speed was improved but not as much as I would have expected. On inspection it became very clear what was going on. I feel sure that this behavior has been seen many times before and there is probably a design pattern to solve the problem but it eludes me and I'm not even sure how to describe it. It is easiest explained with an example. Let's imagine the interface is interface IMyCode { List<IThing> getLots( List<String> ); IThing getOne( String id ); } The getLots() method calls getOne() and fills up the list before returning. The interface is implemented at the client which is proxied to a remoting client which then calls the remoting server which in turn calls the implementation at the server. At the client and the server layers there is also a cache. So we have :- Client interface | Client cache | Remote client | Remote server | Server cache | Server interface If we call getOne("A") at the client interface, the call is passed to the client cache which faults. This then calls the remote client which passes the call to the remote server. This then calls the server cache which also faults and so the call is eventually passed to the server interface which actually gets the IThing. In turn the server cache is filled and finally the client cache also. If getOne("A") is again called at the client interface the client cache has the data and it gets returned immediately. If a second client called getOne("B") it would fill the server cache with "B" as well as it's own client cache. Then, when the first client calls getOne("B") the client cache faults but the server cache has the data. This is all as one would expect and works well. Now lets call getLots( [ "C", "D" ] ). This works as you would expect by calling getOne() twice but there is a subtlety here. The call to getLots() cannot directly make use of the cache. Therefore the sequence is to call the client interface which in turn calls the remote client, then the remote server and eventually the server interface. This then calls getOne() to fill the list before returning. The problem is that the getOne() calls are being satisfied at the server when ideally they should be satisfied at the client. If you imagine that the client/server link is really slow then it becomes clear why the client call is more efficient than the server call once the client cache has the data. This example is contrived to illustrate the point. The more general problem is that you cannot just keep adding proxied layers to an interface and expect it to work as you would imagine. As soon as the call goes 'through' the proxy any subsequent calls are on the proxied side rather than 'self' side. Have I failed to learn or not learned something correctly? All this is implemented in Java and I haven't used EJBs. It seems that the example may be confusing. The problem is nothing to do with cache efficiencies. It is more to do with an illusion created by the use of proxies or AOP techniques in general. When you have an object whose class implements an interface there is an assumption that a call on that object might make further calls on that same object. For example, public String getInternalString() { return InetAddress.getLocalHost().toString(); } public String getString() { return getInternalString(); } If you get an object and call getString() the result depends where the code is running. If you add a remoting proxy to the class then the result could be different for calls to getString() and getInternalString() on the same object. This is because the initial call gets 'deproxied' before the actual method is called. I find this not only confusing but I wonder how I can control this behavior especially as the use of the proxy may be by a third party. The concept is fine but the practice is certainly not what I expected. Have I missed the point somewhere?

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