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• Linux QoS (Skype / BitTorent / SIP / HTTP priority)

  - by Andre

  We are configuring a linux box that will act as internet gateway for an office of 30-50 computers. We are using iptables/HTB for traffic shaping. Is there a way to match traffic on L7 level? It's easy to identify traffic by TCP/UDP ports (like SIP and HTTP). But what if we are dealing with Skype & BitTorent? It was surprise for me that there is no powerful and matured sulution for tasks like this. I found only l7-filter (http://l7-filter.clearfoundation.com/) patch for the Linux kernel, but it's no longer supported (it seems to). Moreover it couldn't be compiled with modern Linux kernels. The only option I found was to use a Cisco router. Are there other ways to identify and shape Skype and Bittorent traffic?

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• ASUS N550 laptop not charging on ubuntu after updating kernel

  - by OBY Trance

  I'm using Ubuntu 13.10 on a pretty new ASUS N550jv laptop. When I was using kernel linux-image-3.11.0-11 everything was quite well (kinda..), however, when I updated the kernel using the automatic update, the kernels which were released afterwards (12+) were faulty on my machine, and caused the battery not to be charged and only stay at their current charging level (even when the machine was off!) The only fix I had was to roll-back to the '..11' version (on boot screen - advanced options), and hard-reboot (AC cord disconnected and reconnected) but now version 14 was released and "pushed away" the good old version 11. How can I fix that?? Please help me...

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• Is PO Box on resume to get a call okay?

  - by sanksjaya

  Hello folks! Personally I've applied to quiet a handful of IT admin jobs inside my state and to the ones that are way far away. The sad part is I never miss to get an interview with the jobs in my state, but get a call once in a blue moon from jobs out of my state. Note: All the jobs are of similar nature. Recently one of my friends told me that "Applicants with local addresses are the ones that are even looked upon". How true is this? Does filtering take place at address level before qualifications? Is using a PO box on resume acceptable [one for each state like CA, TX, VA]? Any other suggestions to get calls from out of state? Thank you :) [wiki]

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• php.ini settings change not taking effect for large file uploads

  - by user51347

  My server was just reprovisioned, and my application which uploads large (100M+) files now breaks upon re-installation. the symptom is quite consistent : smaller files (8mb in my tests) upload just fine. Larger files cut off at quite close to the same point every time given a particular computer. a file that fails at 26% will fail at just about the same every time. One that takes 1:40s to fail will take within 2 seconds of that every time, before failure. I have set my php.ini settings extravagently : post_max_size = 512M upload_max_filesize = 512M max_input_time = 3600 max_execution_time 3600 Is there possibly a setting at the Apache Level which would override PHP?

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• Apache Bench length failures

  - by Laurens

  I am running Apache Bench against a Ruby on Rails XML-RPC web service that is running on Passenger via mod_passenger. All is fine when I run 1000 requests without concurrency. Bench indicates that all requests successfully complete with no failures. When I run Bench again with a concurrency level of 2, however, requests start to fail due to content length. I am seeing failures rates of 70-80% when using concurrency. This should not happen. The requests I am sending to the web service should always results in the same response. I have used cURL to verify that this is in fact the case. My Rails log is not showing any errors as well so I am curious to see what content Bench actually received and interpreted as a failure. Is there any way to print these failures?

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• How can I disable write protection in my USB flash drive?

  - by 97847658

  My USB flash drive is currently unusable because it somehow (quite suddenly!) became write protected. I have googled around and tried many solutions to this problem, but none of them have worked so far. Here are some of the solutions I've tried: The drive has no tangible switch or button. Formatting the drive won't work, even in command line, even "low level formatting", because the drive is (after all) write protected. Changing certain registry keys to 0 doesn't seem to work. Repair_Neo2.9.exe says "USB Flash Disk not found!" One factor that may make it more difficult to find a solution: I have no idea what the make or model is, because I received the USB flash drive from my university as a gift. So if anyone knows how to find the make and model, that alone might be helpful. Any ideas? Thanks.

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• Someone tried to hack my Node.js server, need to understand a GET request in the logs

  - by Akay

  Alright, so I left my Node.js server alone for a while and came back to find some really interesting stuff in the logs. Apparently some moron from China or Poland tried to hack my server using directory traversal and what not, while it seems though he did not succeed I am unable understand few entries in the log. This is the output of a "hohup.out" file. The attack starts, apparently he is trying to find out some console entry in my server. All of which fail and return a 404. [90mGET /../../../../../../../../../../../ [31m500 [90m6ms - 2b[0m [90mGET /<script>alert(53416)</script> [33m404 [90m7ms[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET / [32m200 [90m1ms - 240b[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET /pz3yvy3lyzgja41w2sp [33m404 [90m1ms[0m [90mGET /stylesheets/style.css [33m404 [90m0ms[0m [90mGET /index.html [33m404 [90m1ms[0m [90mGET /index.htm [33m404 [90m0ms[0m [90mGET /default.html [33m404 [90m0ms[0m [90mGET /default.htm [33m404 [90m1ms[0m [90mGET /default.asp [33m404 [90m1ms[0m [90mGET /index.php [33m404 [90m0ms[0m [90mGET /default.php [33m404 [90m1ms[0m [90mGET /index.asp [33m404 [90m0ms[0m [90mGET /index.cgi [33m404 [90m0ms[0m [90mGET /index.jsp [33m404 [90m1ms[0m [90mGET /index.php3 [33m404 [90m0ms[0m [90mGET /index.pl [33m404 [90m0ms[0m [90mGET /default.jsp [33m404 [90m0ms[0m [90mGET /default.php3 [33m404 [90m0ms[0m [90mGET /index.html.en [33m404 [90m0ms[0m [90mGET /web.gif [33m404 [90m34ms[0m [90mGET /header.html [33m404 [90m1ms[0m [90mGET /homepage.nsf [33m404 [90m1ms[0m [90mGET /homepage.htm [33m404 [90m1ms[0m [90mGET /homepage.asp [33m404 [90m1ms[0m [90mGET /home.htm [33m404 [90m0ms[0m [90mGET /home.html [33m404 [90m1ms[0m [90mGET /home.asp [33m404 [90m1ms[0m [90mGET /login.asp [33m404 [90m0ms[0m [90mGET /login.html [33m404 [90m0ms[0m [90mGET /login.htm [33m404 [90m1ms[0m [90mGET /login.php [33m404 [90m0ms[0m [90mGET /index.cfm [33m404 [90m0ms[0m [90mGET /main.php [33m404 [90m1ms[0m [90mGET /main.asp [33m404 [90m1ms[0m [90mGET /main.htm [33m404 [90m1ms[0m [90mGET /main.html [33m404 [90m2ms[0m [90mGET /Welcome.html [33m404 [90m1ms[0m [90mGET /welcome.htm [33m404 [90m1ms[0m [90mGET /start.htm [33m404 [90m1ms[0m [90mGET /fleur.png [33m404 [90m0ms[0m [90mGET /level/99/ [33m404 [90m1ms[0m [90mGET /chl.css [33m404 [90m0ms[0m [90mGET /images/ [33m404 [90m0ms[0m [90mGET /robots.txt [33m404 [90m2ms[0m [90mGET /hb1/presign.asp [33m404 [90m1ms[0m [90mGET /NFuse/ASP/login.htm [33m404 [90m0ms[0m [90mGET /CCMAdmin/main.asp [33m404 [90m1ms[0m [90mGET /TiVoConnect?Command=QueryServer [33m404 [90m1ms[0m [90mGET /admin/images/rn_logo.gif [33m404 [90m1ms[0m [90mGET /vncviewer.jar [33m404 [90m1ms[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET / [32m200 [90m7ms - 240b[0m [90mOPTIONS / [32m200 [90m1ms - 3b[0m [90mTRACE / [33m404 [90m0ms[0m [90mPROPFIND / [33m404 [90m0ms[0m [90mGET /\./ [33m404 [90m1ms[0m But here is when things start getting fishy. [90mGET http://www.google.com/ [32m200 [90m2ms - 240b[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET / [32m200 [90m1ms - 240b[0m [90mGET /robots.txt [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m0ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m3ms[0m [90mGET /manager/html [33m404 [90m0ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m0ms[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET http://37.28.156.211/sprawdza.php [33m404 [90m1ms[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET http://www.google.com/ [32m200 [90m2ms - 240b[0m [90mHEAD / [32m200 [90m1ms - 240b[0m [90mGET http://www.daydaydata.com/proxy.txt [33m404 [90m19ms[0m [90mHEAD / [32m200 [90m1ms - 240b[0m [90mGET /manager/html [33m404 [90m2ms[0m [90mGET / [32m200 [90m4ms - 240b[0m [90mGET http://www.google.pl/search?q=wp.pl [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m0ms[0m [90mHEAD / [32m200 [90m2ms - 240b[0m [90mGET http://www.google.pl/search?q=onet.pl [33m404 [90m1ms[0m [90mHEAD / [32m200 [90m2ms - 240b[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET http://www.google.pl/search?q=ostro%C5%82%C4%99ka [33m404 [90m1ms[0m [90mGET http://www.google.pl/search?q=google [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET http://www.google.com/ [32m200 [90m2ms - 240b[0m [90mHEAD / [32m200 [90m2ms - 240b[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m0ms[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET http://www.baidu.com/ [32m200 [90m2ms - 240b[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mPOST /api/login [32m200 [90m1ms - 28b[0m [90mGET /web-console/ServerInfo.jsp [33m404 [90m2ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET http://www.google.com/ [32m200 [90m10ms - 240b[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET http://proxyjudge.info [32m200 [90m2ms - 240b[0m [90mGET / [32m200 [90m2ms - 240b[0m [90mGET / [32m200 [90m1ms - 240b[0m [90mGET http://www.google.com/ [32m200 [90m3ms - 240b[0m [90mGET http://www.google.com/ [32m200 [90m3ms - 240b[0m [90mGET http://www.baidu.com/ [32m200 [90m1ms - 240b[0m [90mGET /manager/html [33m404 [90m0ms[0m [90mGET /manager/html [33m404 [90m1ms[0m [90mGET http://www.google.com/ [32m200 [90m2ms - 240b[0m [90mHEAD / [32m200 [90m1ms - 240b[0m [90mGET http://www.google.com/ [32m200 [90m1ms - 240b[0m [90mGET http://www.google.com/search?tbo=d&source=hp&num=1&btnG=Search&q=niceman [33m404 [90m2ms[0m So my questions are, how come my server is returning a "200" OK for root level domains? How did the hacker even manage to send a GET request to my server such that "http://www.google.com" shows up in the log while my server is simply an API that works on relative URLs such as "/api/login". And, while I looked up the OPTIONS, TRACE and PROPFIND HTTP requests that my server has logged it would be great if someone could explain what exactly was the hacker trying to achieve by using these verbs? Also what in the world does "[90m [32m [90m1ms - 240b[0m" mean? The "ms" makes sense, probably milliseconds for the request, rest I am unable to understand. Thank you!

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• Started an application through SSH, command line now gone, what happens next?

  - by Chris Dutrow

  Context: This is a very basic question Using Putty and SSH for the first time to do some serious server setup and run into the situation where I have started a process that I do not want to stop. The process is the gunicorn WSGI HTTP Server (running on Centos 6.3). The command I used to start the process is (as per their Quick Start): gunicorn -w 4 myapp:app At this point in the work session, I have lost the command prompt. This must be such a non-issue that it doesn't even enter into an experienced user's consciousness. But unfortunately at my level of experience, I am left with several fundamental questions: Does the fact that I have lost the command prompt mean that the process is still running? How do I get back to the command prompt without killing the process? How do I come back and monitor the process later? How do I eventually kill the process? Any help is appreciated, thanks so much!

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• Where does traffic shaping typically take place?

  - by eekmeter

  As part of upgrading our network infrastructure we are looking to traffic shape our bandwidth since we only have about 3Mb down / 1 Mb up. We're looking to prioritize it so that web browsing gets priority and in the future some VOIP might be added in as well. Internal LAN traffic doesn't need to be controlled just our outbound connection. I've been looking at Cisco hardware and it seems that several of their products do shaping at the core switch, firewall, and router level. I'm wondering where does shaping normally take place? Is it normally done at the router, core switch, or firewall?

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• How to troubleshoot Application Popup issues 0XC0000142 and 0XC000009a

  - by DotDot

  I am running randomly into 1 of these popups when our application runs. The machines range from 8GB/8Core to 24GB/24Core and run Windows Server 2008 R2. The application is a bunch of perl scripts and exe's that are expected to utilitize the server well. The process tree can be quite deep (5-6 child levels) and quite broad (60-70 level 1 processes). We hit this issues every 1% run on random machines. The application stalls on popup, unless someone clicks the damn button. The event log reads as cmd.exe - "Failed to initialize app. Click OK to close app" How could I reliably repro these issues?

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• RAID striping on a desktop machine

  - by Blazemore

  I currently have a 120Gib SSD which is pretty fast for things like game loading times and video editing. However, I was wondering about getting another identical drive and hooking it up with a striping RAID array in hardware (I boot multiple operating systems). This would have the dual benefits of providing a larger logical drive, while also providing greater performance. However, I have a few questions: What kind of performance increase can I expect to see with a pair of good quality SSDs? How expensive is a quality desktop RAID controller? Will the controller present the OS with a single logical drive? Does this mean I can still partition it and multi-boot? Basically, can I treat the RAID controller as "a hard drive" at the OS level?

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• Zentyal Server : Setting up secure VPN Client

  - by JustShrey

  I have officially exhausted pretty much all my google-fu trying to set this up so I'm asking my question here. For the record, I am a mid level rookie who has played around with servers in his spare time but have never worked with Zentyal Server. Now, I have been able to set up the server as a gateway, with one Network card being external and the other facing the internal Network. The Internal network computers are able to access the internet without any issues. What I need to do is to setup a open-vpn client on the central server so that all Internet data goes though the secure VPN session. As far as I can see, I can't set up the vpn session through the web admin page. Could somebody point me in the right direction? How would I go about doing this? Regards Shreyas

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• Will an SSD help prevent laptop overheating?

  - by alex

  My laptop has a severe overheating problem, even though it's quite new (< 6 month). It's still regularly overheating to the point where it shuts down. This usually happens while playing games but sometimes while watching videos or using Skype video calls for a long time. I'm already keeping it mid-air on a cooling tray with 2 external coolers, but that doesn't seem to help. The only other thing I can think of is installing an SSD instead of the current HDD. I've read up that they generate less heat then hard drives, but can it actually make a serious difference to the heat level of the laptop? If there are any other suggestions, please feel free to comment. The laptop is a Toshiba Satellite L650D-11R.

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• Linux (Ubuntu) USB Auth

  - by themicahmachine

  I want to be able to authenticate with PAM using a USB drive with a file on it. I've read about how to do this with a PAM module that reads the specific USB hardware ID of a device, but if the device malfunctions or is lost, there would be no way to authenticate. I would prefer to use the method BitLocker uses, requiring a particular file to be found on the drive in order to authenticate. That way I can keep another drive in a secure location as a backup. Any other suggestions are welcome. I just want to require a higher level of security that just a password.

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• Prevent specific applications from being run as administrator

  - by Unsigned

  Background Most installation toolkits have the ability to launch, automatically or otherwise, external programs after installation. This is often appears in the installer via such options as "Show readme", or "Start program". Issue The problem is, many of these installers are poorly coded, and do not drop permissions appropriately. For example, starting the application automatically, or opening the application's homepage in the browser, often results in launching the application or browser with the installer's Administrative privileges, or a "High" UAC integrity level! This has the potential to open up security breaches, by opening up the installed application, or a web page (and possibly browser add-ons), that are now running with elevated permissions. (This is the reason I strongly recommend never choosing auto-launch options when installing software.) Question The question is: Is there a way to prevent certain applications (such as a web browser) from ever being launched with Administrative privileges, i.e., an automatic drop-privilege?

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• Run 2008 R2 Service under 2000 Domain Account

  - by NoDisassemble

  I'm trying to get a service to run under a domain account. When I try to add the account, I get the error The account name is invalid or does not exist, or the password is invalid for the account name specified I know the account exists and the password is correct. I am also having trouble adding it manually to the "Log on as a service" setting, I get the error An extended error has occured. Failed to save Local Policy Database After a day of research I'm starting to suspect it has to do with it being a 2008 R2 server trying to use a 2000 domain account. I've tried to change the LAN Manager authentication level and the Minimum session security looks okay per my Google digging. I'm not sure what else I can do?

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• Hosting solution for sensitive client data

  - by Mark

  Hello, We are developing a web application that will deal with highly sensitive (financial) data of clients (audience is medium to large sized businesses). Clients will be under scrutiny from regulators & auditors and, as such, we will be too. More importantly to give clients a level of comfort our application and related hosting arrangement should instill a lot of confidence with them. We are looking into using a cloud based service like Linode, Amazon EC2, etc. To allow for maximum flexibility We are keen on putting everything on virtual servers and avoiding having to buy our own hardware. Does a cloud based service make sense for our particular scenario? If not what type of hosting should we consider? If so what should we look out for? Thanks!

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• Remote Destkop into Server 2008R2 with Firewall On

  - by Eternal21

  I've got a fresh install of Remove Server 2008 R2, 64 bit. The problem is I can't Remote Destkop into it. I clicked 'Enable Remote Desktop' inside 'Initial Configuration Tasks', and set it to: Allow connections only from computers running Remote Destkop with Network Level Authentication (more secure). The thing is, this used to work just fine, and then it stopped. The only way I can get it to work now is if I turn of Windows Firewall completely off (Public network location settings). Obviously I don't want to run the server with firewall off, so what specific settings in Firewall do I need to disable, or am I doing something wrong?

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• Missing files when Windows 7 returns from hibernate w/ dual boot

  - by Arthur N

  I have a dual-boot setup with Ubuntu (lucid) and Windows 7. I have the Windows file system shared on Ubuntu through Samba. Occasionally, I am working on Windows and my machine will go into hibernate (i.e. when the battery level is critical). By default, my GRUB settings boot me into Ubuntu. So when I get back to my PC, sometimes I just hop into Ubuntu instead of going back to Windows. However, if I write any files to the Windows file system during that Ubuntu session, the next time I do go back to Windows (which resumes from hibernate), those files are missing. Obviously, the state of the actual file system and the hibernate snapshot become out of sync, and Windows chooses the hibernate snapshot, overriding any changes I may have made thru Ubuntu. For now, I've disabled the hibernate option in the Windows power settings, but is there any utility I can use to get back some of those missing files?

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• migration of physical server to a virtual solution, what i have to do?

  - by bibarse

  Hello I'm new in this forum, so i would like that you forgive me for my blissfully and my low English level. I'm a trainee in company one month ago, and my mission is to migrate 3 physicals servers to a virtualization technology. The company edit softwares for E-learning so there are lots of data like videos, flash and compressed (zip). This is some inventory of the servers: OS: Debian, 2 redhat, apache, php/mysql, sendMail/Dovecot, webmin with virtualmin template to create dynamically the web sites because there is no sysadmin ... The future provider will be responsible of to secure, update and create the virtual machines (outsourcing) and with a RedHat OS's. So i want that you help me to choose a virtualisation technologie (for the i prefer KVM of Redhat RHEV, VMWare is expensive), how evaluate the hardware needs (this for evolution of 4 or 5 years) and to elaborate a good planing to don't forget any think. Thank you for your responses.

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• Replacing explorer.exe under Windows 7

  - by Whitey

  A bit of an odd request I gather, but for reasons too deep to go into detail here I need to replace my explorer.exe in the C:\Windows directory. I have tried doing it myself, through the GUI and command prompt (ran as administrator) but I get access denied. It seems that being an admin on your machine is not the highest permission level after all, and only Trusted Installer can modify the file. Does anybody know a way that works? I was about to boot into safe mode and try it but wanted to get some feedback before I do anything in-depth. Thanks.

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• Small WiFi Network In a Noisy Environment

  - by Sam Skuce

  My company is demoing our network enabled products at big conferences. For this purpose, we would like to be able to set up a small WiFi network in our booth with a range of less than 10 meters. We will only be connecting the device that we are demoing and the iPad or PC running our demo software. I understand that there are conferences that won't allow you to run your own WiFi equipment, but some fairly big ones do (e.g. IMTS, which we were just at). I know that the AP should be encrypted and not broadcast its SSID, but are there additional equipment considerations to deal with the high level of RF noise in such an environment? Is there a particular technology that I should be looking at?

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• How can I tell if a host is bridged and acting as a router

  - by makerofthings7

  I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is configured correctly. What IP, ICMP, or SNMP (etc) tricks can I use to poll the hosts and determine if the host is acting as a router? I'm assuming this test would presume I know the target IP, but in a large network with many subnets, I'd have to test many different combinations of networks and see if I get success. Here is one example (ping): For each IP in the DMZ, arp for the host MAC Send a ICMP reply message to that host directed at an online host on each subnet I think that there is a more optimal way to get the information, namely from within ICMP/IP itself, but I'm not sure what low level bits to look for. I would also be interested if it's possible to determine the "router" status without knowing the subnets that the host may be connected to. This would be useful to know when improving our security posture.

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• SSL encryption standards by browser

  - by hfidgen

  Hiya, Does anyone have a table of the default levels of encryption which the various browsers out there support? For instance I know that IE5 and lower struggle even to cope with 40 bit encryption but the latest browsers easily do 256 and beyond. The reason I ask is that I'm looking to get a wildcard certificate for my domain and the price difference is huge between a server gated certificate (where it enforces a minimum of 128bit) and a non-gated certificate (where the browser sets the encryption level). Obviously I like the idea of paying £300 less for the non-gated certificate, but only if I can be sure that the majority of my users (FF3 / Opera / Chrome / IE7+) are going to get good encryption.

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• In a virtual machine monitor such as VMware’s ESXi Server, how are shadow page tables implemented?

  - by ali01

  My understanding is that VMMs such as VMware's ESXi Server maintain shadow page tables to map virtual page addresses of guest operating systems directly to machine (hardware) addresses. I've been told that shadow page tables are then used directly by the processor's paging hardware to allow memory access in the VM to execute without translation overhead. I would like to understand a bit more about how the shadow page table mechanism works in a VMM. Is my high level understanding above correct? What kind of data structures are used in the implementation of shadow page tables? What is the flow of control from the guest operating system all the way to the hardware? How are memory access translations made for a guest operating system before its shadow page table is populated? How is page sharing supported? Short of straight up reading the source code of an open source VMM, what resources can I look into to learn more about hardware virtualization?

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