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• display port on x230 not workgin

  - by Aaron

  having problems with my new lenovo x230 - using dual montiors, only vga registers anything. This has the Intel graphics controller : 00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) TO get it to even boot, had to add the nomodeset parameter to the kernel. Otherwise will not even start up X Ive upgraded my kernel to the latest 3.6 with no difference. The display section reads the monitor as the only display and labels it as laptop. Cant seem to get it to work! Any help would be greatly appreciated.

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• telnet: Could not open connection to the host, on port 23

  - by Mihaela

  I need to telnet, to localhost. I am on windows. Once I got the error 'telnet is not recognized...' I looked online and found that I should do pkgmgr /iu:"TelnetClient". I did, then telnet localhost (0r 127.0.0.1, maybe with a port at the end), I get error: Could not open connection to the host, on port 23: Connect failed. I added the port to the firewall, disabled the firewall.. run as admin.. Please help me get telnet to work! Thank you.

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• Which TCP ports to use?

  - by rowatt

  Is there a TCP port range which I can be sure will not be used by anything else for traffic between two machines? If I am reading RFC6335 correctly, I can be sure that no other applications will use specific ports in the Dynamic/Private/Ephemeral range of 49152-65535. However, if I understand correctly, it also states (section 8.1.2) that an application shouldn't assume that any given port in that range is available at any given time, which would mean I can't be 100% sure that it will be unused all the time. Specifically, I want to assign specific SSH traffic to a different port for the security benefit and so I can classify it differently for QoS purposes, and not have to worry about changing the port in the future.

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• Block all ports except SSH/HTTP in ipchains and iptables

  - by user198003

  How can I block all ports except ssh (port 22) httpd (port 80) using iptables and iphains?

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• Access to a network server without port forwarding

  - by SdevDavid

  I have a network with the following structure. The server in PC2 is simple socket server TCP in 8080 port. I need to access to PC2 from other external network by socket client. This socket client knows the public IP (85.xxx.xxx.x), the private IP (192.168.0.21) and the port. How I can access PC2 without port forwarding on the router? If possible, I would like to have a reference in any programming language of this case.

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• Port an existing Quickly app from precise to quantal

  - by Ian B.

  I've developed an app using Quickly on a 12.04 system. In preparation for the 12.10 release, I'd like to have launchpad build a version for Quantal so that it can be used and tested by people from my ppa. I'm not willing to upgrade my system yet (I depend on it for work), how can I do this from 12.04 and my current quickly project? I have a virtualbox with 12.10 installed for testing, but I don't want to copy over the quickly project if I don't have to. Ideally, an answer should work with the quickly submitubuntu command so that it is packaged for installation in the /opt/extras.ubuntu.com directory.

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• Hooking domain to home server (WinServer2008) with specific port

  - by user1071461

  Alright, I'm asking two things here. First of all, if i purchase a domain let's say myhomeserver.com, am I able to make the default port go through a different port instead of the default port 80? (that is without having to do myhomeserver.com:5000 for example). Also this should be without blocking other ports (so no stealth forwarding to myhomeserver.com:5000 i think) Secondly, How could I go about hooking a domain to a windows 2008 server? I've seen it on linux but no clue how to do it on windows if it's even possible. I know I'm asking a lot here, just some tips are appereciated. Also, yes I know, using a home server is horrible for security and preformance and whatnot, I understand this already, thanks ^^

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• UFW blocking webrick on port 3000

  - by t Book

  On a ubuntu 10.0.4 server runs redmine. starting webrick with: ./server webrick -e production -b lvps46-173-79-113.dedicated.hosteurope.de -d makes redmine available in browser. as soon as we enable ufw, webrick can´t be accessed anymore. of course we allowed Port 3000 from anywhere ufw allow 3000/tcp ufw allow 3000/udp also a grep for iptables doesn´t show a deny rule iptables -nL | grep 3000 find the whole iptables output here http://pastebin.com/k6WNqdPU checking lsof -ni tcp:2222 tells me ruby is listening on port 3000 ruby 3457 root 5u IPv4 864846667 0t0 TCP 46.173.79.113:3000 (LISTEN) What else can we check? what´s wrong with the ufw rules for port 3000?

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• How do I allow a non-default user to use serial device ttyUSB0?

  - by lucaghera

  I have an Ubuntu 11.10 system with 2 users: The first was created during the installation The second instead was created after. It belongs to the sudoers group. Now the problem is that when the second tries to use a device ttyUSB0 the following error is returned: "Could not open serial port /dev/ttyUSB0" I was able to fix it by using: sudo chown :second_user /dev/ttyUSB0 However when I disconnect the device and reconnect it the problem comes back. Is there a way to allow different users to access the devices? I suppose I have to add the user to a specific group. Currently the owner is root and the group is dialout. However I'm not sure about the group and I don't know how to add the user. Thanks!

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• Port forwarding (portmap) works only locally

  - by Tag Wint

  There are four hosts hostA winXP hostB Win2003 hostC Linux RHEL hostD Linux RHEL hostA cannot connect to C and D directly, but B can hostA connects to hostB using VPN hostB and hostC belong to the same subnet1 hostD is in subnet2 From hostA I need to connect to hostC and hostD by SSH. Now I can do it as follows: 1.connecting from hostA to hostB by RDP logon and there: 2.start putty client. I'd like to omit step 1 and connect from A to C and D directly On hostB I have admin acoount and configure port forwarding as follows: netsh interface portproxy add v4tov4 listenport=N1 connectaddress=hostC_IP connectport=N2 netsh interface portproxy add v4tov4 listenport=N3 connectaddress=hostD_IP connectport=N2 netsh interface portproxy show all: Listen on IPv4: Connect to IPv4: Address Port Address Port --------------- ---------- --------------- ---------- * N1 hostC_IP N2 * N3 hostD_IP N2 Now from hostB I can connect to either C and D: ssh localhost:N1 ssh localhost:N3 from hostA ssh hostB:N1 works too, but ssh hostB:N3 DON'T I guess the reason might be different subnets, still have no idea how to fix it. What should I do?

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• Why do things change between using a LiveCD/LiveUSB and installing Ubuntu?

  - by ahow628

  Here have been a couple of weird experiences I've had with a Ubuntu LiveCD or LiveUSB: 1) I had one of the original Chromebooks (CR-48). I ended up wiping ChromeOS and installing only Ubuntu 12.04.0 just after it came out. It worked like a charm. About a year later, I broke something and reinstalled Ubuntu using 12.04.3 on a LiveUSB. The LiveUSB worked perfectly - screen resolution, wifi, trackpad all worked fine. I installed it (once installing updates, once stock from the USB drive) and both times screen resolution, wifi, and trackpad all broke. I ended up downloading 12.04.0 and installing it then upgrading to 12.04.3 after the fact and everything worked perfectly once again. 2) I purchased a Toshiba Portege z935 and the LiveUSB worked perfectly, namely the wifi. After install, wifi was extremely slow and basically couldn't load any pages. The answer was that Bluetooth conflicted somehow with wifi and Bluetooth had to be disabled to get wifi to work. Yet both could be enabled in the LiveUSB version, no problem. So my question is, why does this happen? Why does everything work perfectly from the LiveUSB version but then get broken when installed on the system? Is there a different way to install Ubuntu that would allow things to be installed over exactly as they were on the LiveUSB version (drivers, settings, etc)? Are there assumptions that the install makes that I could override somehow?

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• Network and Storage Devices Throughput Chart

  - by zroiy

  With all of the different storage and network devices that surround our day to day life, understanding these devices data transfer speeds can be somewhat confusing. Think about trying to identify your weakest link in the a chain that starts with an external USB hard drive (or a flash drive) that's connected to a 802.11g wifi router, can you quickly come up with an answer of where's the bottle neck in that chain , is it the router or the storage devices ? . Well, the following chart should give you an idea understanding different devices, protocols and interfaces maximum throughput speeds. Though these numbers can fluctuate (mostly for worse, but sometimes for the better) due to different kind of factors such as OS overhead (or caching and optimization) , multiple users or processes and so on , the chart can still serve to provide basic information on the theoretical throughput different devices and protocols can get to.. Enjoy.  Link to the full size chart   References:http://en.wikipedia.org/wiki/Sata#SATA_revision_1.0_.28SATA_1.5_Gbit.2Fs.29http://en.wikipedia.org/wiki/Usbhttp://en.wikipedia.org/wiki/Usb_3http://en.wikipedia.org/wiki/802.11http://mashable.com/2011/09/21/fastest-download-speeds-infographic/http://en.wikipedia.org/wiki/Thunderbolt_(interface)http://www.computerworld.com/s/article/9220434/Thunderbolt_vs._SuperSpeed_USB_3.0  Icons:http://openiconlibrary.sourceforge.net/gallery2/?./Icons/devices/drive-harddisk-3.png      

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• What functionality of an iPad can I use with Ubuntu?

  - by Andrew Ferrier

  What functionality of an iPad can I use with Ubuntu? I'm thinking about buying an iPad, but I only have Ubuntu PCs these days (no Windows, no Mac), and I'm nervous that it may be too reliant on the existence of iTunes. I'm less concerned about getting media onto and off it (and I have read that I can do this with libimobiledevice), but will I be able to activate it with iTunes? Does it need to be USB synced on a regular basis, or can I do most anything I want through the cloud (i.e. over wifi)? Edit: In answer to jrgifford's question, in theory, I'd like to do everything I would want to do with it were I using Windows/Mac. But more specifically, I think I'd want to: "Activate" it, if that's necessary Copy music / video onto it Install apps How much of this can I do without a Windows/Mac PC? Is it necessary to activate it? I don't think I'm that interested in backing it up (what would I back up?), but then again, maybe I'm confused as to how easy it is to get data on and off. Can I get a regular SFTP app for the iPad to copy data to my Ubuntu machine over wi-fi, for example?

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• Ubuntu hangs after replugging the modem

  - by Iftekhar Ahmed Shafi

  I am facing this issue on Ubuntu 12.04, which is for my Wimax modem with beceem chipset. If I replug the device Ubuntu goes in hang state. Its happens very often. If I plug the USB and restart it works most of the time. But it is very annoying to restart every time it hangs. The modem works smoothly in Windows 7. And it used to work OK in Ubuntu 11.10. Jun 13 19:25:54 iftekhar-HP-520-Notebook-PC dbus[1102]: [system] Activating service name='org.freedesktop.UDisks' (using servicehelper) Jun 13 19:25:54 iftekhar-HP-520-Notebook-PC dbus[1102]: [system] Successfully activated service 'org.freedesktop.UDisks' Jun 13 19:26:00 iftekhar-HP-520-Notebook-PC goa[2168]: goa-daemon version 3.4.0 starting [main.c:112, main()] Jun 13 19:26:47 iftekhar-HP-520-Notebook-PC udevd[432]: timeout 'cdrom_id --lock-media /dev/sr1' Jun 13 19:26:48 iftekhar-HP-520-Notebook-PC udevd[432]: timeout: killing 'cdrom_id --lock-media /dev/sr1' [1072] Jun 13 19:26:49 iftekhar-HP-520-Notebook-PC kernel: [ 85.820162] sr 2:0:0:0: Device offlined - not ready after error recovery Jun 13 19:26:49 iftekhar-HP-520-Notebook-PC udevd[432]: timeout: killing 'cdrom_id --lock-media /dev/sr1' [1072] Jun 13 19:27:20 udevd[432]: last message repeated 31 times Jun 13 19:27:25 udevd[432]: last message repeated 4 times What can I do to avoid this hangs and restarts?

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• Huawei e303c data-card not working for Ubuntu 11.04?

  - by Umashankar

  Cheers to you. I got a problem in making a Mobile-BroadBand connection in Ubuntu 11.04, using 'Huawei e303c' usb data-card. I'm using Tata Docomo 3G sim-card (India, circle: Maharastra). My observations: 1.) I installed the device's driver 'Mobile-Partner For Linux'(which came up with the device). But it is not detecting my device. 2.) In Network Manager, Adding a Mobile-BroadBand connection is not able to detect the device (with or without the device's driver installed). 3.)I tried softwares like usb_modeswitch, gnomeppp, wvdial, sakis3G and followed their guidelines. These too didn't work. 4.) Without the driver, the system is able to identify the device (Mobile-Partner icon comes-up, that leads to driver setup files). But after installing the driver, nothing comes-up there. 5.) In all the above cases, when 'lsusb' cmd is fired, the prompt shows the connected data card (as 'DEVICE_ID:VENDOR_ID Huawei Technologies Ltd.,'). This is my problem. Give a solution to get my device connected. -Umash

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• Boot problems w/ External HDD

  - by JeremyT

  I'm having a problem with booting a live image off of a USB Hard Drive. I used Startup Disk Creator to make an Ubuntu 11.10 live image on a partition on my external so that I can use it on various computers. I set it up with ~4GB of persistent data So far I've tried it on two computers. One, a Dell, will boot to my external but it loads the select boot device very slowly. It hangs on a screen with an underscore for up to 5 minutes until it allows me to select which drive I want to boot from. After that, it works great. However, on my primary computer it doesn't work at all. It's an Acer from 2009 and it won't even recognize the drive. I don't see it anywhere in BIOS or the select boot disk list. The light on the external will come on at boot just fine so I know it's powering it at this time. Both computers worked perfectly with my 4GB flash drive that I had partitioned half and half (1st half FAT32 and second Ubuntu 11.10 live)

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• Resize a pendrive Linux?

  - by user11239

  I'm running Ubuntu from USB media, which has a drive capacity of 250 GB, all existing as one FAT32 partition. However, when I created the bootable Ubuntu drive, only 4.79 GB were allocated for usage. Rather than put files directly into the /cdrom where the drive is mounted, I want to expand what is listed here in aufs to be at least 200 GB. I'm hopeful that I can do this live. Output of df : Filesystem 1K-blocks Used Available Use% Mounted on aufs 4051904 4050108 0 100% / none 1542852 284 1542568 1% /dev /dev/sdb1 244076800 4901648 239175152 3% /cdrom /dev/loop0 688000 688000 0 100% /rofs none 1547840 1496 1546344 1% /dev/shm tmpfs 1547840 4828 1543012 1% /tmp none 1547840 80 1547760 1% /var/run none 1547840 0 1547840 0% /var/lock none 1547840 0 1547840 0% /lib/init/rw Output of fdisk -l : Disk /dev/sdb: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00083fe4 Device Boot Start End Blocks Id System /dev/sdb1 * 1 30401 244196001 c W95 FAT32 (LBA) So basically what I want to do is get /dev/sdb1 to be entirely, or almost entirely read as aufs. I'm confused over how to do this, as the file systems are all part of /dev/sdb1 on one big partition, rather than separate partitions for separate file systems.

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• How to get Wifi Working Properly - I am Noob

  - by user287853

  I'm a noob to Ubuntu, but not computers. I installed a full version of Ubuntu version 12 whatever it is. I run it on a machine that has Win7/Win8 on another hard drive. My wireless adapter is some tiny USB stick I got on eBay - it works great in Windows, but I can't get it to work in Ubuntu. More precisely, Ubuntu is providing me a list (sometimes) of wireless networks in the area and when I try to connect to mine it just keeps password prompting me even though the one I use is correct. I looked over all the settings multiple times and don't believe there is anything in error regarding what it takes to connect to my network. So, I thought maybe it is a driver issue and came across NDIS. I thought I should try installing it, but I don't know how when I can't connect the Ubuntu machine to the Internet. I tried some commands to no avail. I have the Ubuntu installation disc and it shows a NDIS common and utils .deb files in there. Can someone out there help me out to get this wireless setup so I can get online?

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• Force startx to run X in a specific resolution and refresh Rate

  - by Z9iT

  From my past experience (using Win-Xp), this particular monitor works only on 60Hz , Best resolution being 1024x768. I have "installed and configured" Ubuntu 12.04 Minimal (on USB stick) so that most of the time terminal is used, however, whenever there is a need to enter GUI, I may issue startx command to go into gnome. However the problem is that on this particular system, issuing this command poses problem because its default refresh rate won't synchronize with the monitor. The display keep on flickering and utterly unreadable. It is visible that gnome has been loaded and default wallpaper and desktop items are visible. But the problem is due to refresh rate different than 60Hz. I am looking for a command attribute to startx command which will force the refresh rate to 60Hz and resolution preferably to 1204x768 I can open terminals with Ctrl+Alt+T and enter commands. Key combinations like Ctrl+Alt+NumPlus works flawlessly in distributions like solaris, but it's not working for me. Also the commands like xrandr -r 60 60 being refresh rate wont work. The same problem is faced even when I boot from a live CD

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• fwupd to update OCZ RevoDrive firmware gets a 'Permission denied' error

  - by Late

  Try as I might I just don't get it working (http://www.ocztechnology.com/ssd_tools/OCZ_RevoDrive_and_RevoDrive_X2/). There's another thread here with an similar issue here: Command is giving me "bash: ./fwupd: cannot execute binary file" I'm running command ./fwupd /dev/sdb which keeps returning me bash: ./fwupd: Permission denied I have tried running both bit versions available of fwupd with both of the latest 32- and 64-bit Ubunty 11.10, running the OS from an USB stick, but to no avail (could this be the problem?). In the other thread it was suggested that chmod +x fwupd (or chmod 0755 fwupd) should resolve this issue, but at least for me it has been for naught. It was also suggested to install certain libraries, but those were already included in the Ubunty build and I didn't have any luck after updating with apt-get. I also tried giving fwupd more privileges, r, x and w but same charade, run it in different ways from different places (where I'd have the fwupd present, ofc) among other things. What I also tried is giving the Ubunty 10.04 LTS a shot but it didn't even launch on either of my computers, though that's not the issue here. If anyone has any ideas on what the problem is and how I could get this working, it would be most appreciated!

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• How do I write to an outer truecrypt volume when the inner volume protection prevents writng?

  - by con-f-use

  In a nutshell After some time using the outer volume of a hidden volume in Truecrypt I cannot write to the outer volume anymore. The protection of the inner volume always kicks in before. How do I fix this? Details I'm using truecrypt's two layered encryption of a USB stick. The outer container carries my semi-sensitive stuff while the inner hidden values has a bit more valuable information. I use both, the inner and outer volume regularly and that is part of the problem. Truecrypt can mount the outer volume for writing while protecting the inner. Usually the inner volume, when not protected this way (or mounted read-only) would be indistinguishable from free space. That is of course part of the plausible deniability scheme of truecrypt. At the beginning, everything worked as expected. I could copy and delete data to the outer volume as I pleased. Now it seams that I have written and deleted enough data to have filled the outer volume once. Despite the write protection Ubuntu tries now to write to the continuous "free space" that is the inner volume. It does that although enough other free space is on the outer volume. But on this free space there used to be data so its fragmented and the file system write prefers continuous space. The write on the continuous free space of the outer volume of course fails (with the error message in the picture above) as Truecrypt's inner-volume-protection kicks in. The Question I know this is expected behaviour, but is there a better way to write to the outer volume that does not attempt to write to the hidden free space at the end? The whole question could be more generally rephrased to: How do I control, where on a partition data is written in Ubuntu?

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• Lots of Internet browsing issues, all browsers

  - by dario_ramos

  Before the upgrade, everything was working fine. Now, however, I can connect to the Internet but a lot of stuff fails, and the weirdest thing is that it happens with Firefox, Chromium and Opera. Some of the things that fail: I can't log in to Stack Overflow, after entering user/pass it loads for a long time on Firefox and throws Error 408 (browser request timed out) on Chromium and Opera I can't log in to Hotmail, similar symptoms I can login to Facebook, but when I try to write a comment, or just post something in my wall, it stays loading for a long time, and then fails The first two issues seem to be related to secure pages, and the second one is another issue altogether, I believe. However, they all happen with all browsers, which is really weird. Talking about weird: I connect using a Huawei SmartAX MT 810 USB modem, which cost me blood and tears to get it working under Ubuntu. I ordered an ethernet modem/router with my ISP, and I'm still waiting, but this issue intrigues me anyway. Has anyone experienced this kind of problems? I Googled around, but couldn't find a similar case.

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• Ubuntu live cd : black screen and blinking cursor

  - by IFasel

  I try to install ubuntu 12.04 on my computer. I can get to the purple screen on the live cd but then, if I choose "Installing Ubuntu", I have a black screen with a cursor blinking (and nothing else happens). My PC : acer aspire M3920, CPU i5-2300, 8 Gb RAM, NVIDIA gt 405. What I already tried : I tried with 12.04 and 13.04 daily build I tried with a live usb and with a live dvd I tried the following boot options : nomodset, acpi=off I googled a lot and it seems that it could be a graphic card problem. Do you know any other boot options that I could try ? UPDATE This is not a duplicate : I've tried all the common boot options (nomodeset, noacpi...) and it doesn't change anything. With the option "no splash" (instead of "quiet splash"), I can see what happens before the forever-blinking cursor : [sdg] no caching mode present [sdg] assuming drive cache : write trough ata8.00: excetion Emask 0x52 ... frozen ata8 : SError : { RecovData RecovComm UnrecovData...} ata8.00 : failed command : IDENTIFY PACKET DEVICE ... ata8.00 : status : { DRDY } ata8 : hard resetting link Does somebody know what it means ? N.B. astonishingly, Puppy Linux boots fine (but Debian, Fedora and Ubuntu do not) Solution In fact, it was not a graphic card problem. I had to disconnect the dvd drive and connect it to another free sata connector (I don't really understand why Ubuntu had trouble with this connector and Windows 7 not). After that, everything worked fine.

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• Unable to launch the asp.net development server because port '80' is in use

  - by kevin

  I need to use port 80 for my development server. Before i restart pc, it's still working fine. After that, it pop up the port 80 is in use. The development server able to run if i changed to other port. I've checked using netstat -ano, no program is using it (my iis is using other port and my skype is not using port 80 as well). I also test with telnet localhost 80, it didnt show any failure message, just the screen goes blank...I'm using win xp. Is my visual studio has problem?

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• How can I listen to multiple Serial Ports asynchronously in C#

  - by Kamiel Wanrooij

  I have an application that listens to a piece of hardware on a USB to Serial converter. My application should monitor more than one serial port at the same time. I loop the serial ports I need to listen to, and create a thread for each port. In the thread I have my data handing routine. When I assign one port, it runs flawlessly. When I listen to the other one, it also works. When I open both ports however, the second port always throws an UnauthorizedAccessException when calling serialPort.Open(). It does not matter in what order I open the ports, the second one always fails. I listen to the ports using serialPort.ReadLine() in a while loop. Can .NET open more than one port at the same time? Can I listen to both? Or should I use another (thread safe?) way to access my serial port events?

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