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• Private VOIP network

  - by SuppositoryPlacebo

  I own a small private security services business. Some of my clients require 2-10 security officers per location. I'm trying to think outside the box in order to solve my communications problem. I'd rather not buy or lease hf radios or voip systems at the current rates. I'm wondering if there is an existing system, or if is at all possible, to setup a private communications network using only a server and bluetooth devices or a wifi/bluethooth combination. http://25.media.tumblr.com/tumblr_m44f0pn7BL1rwp6tgo1_1280.png I don't need "radio" per se. I just need a simple, private voip network. Is there an existing device that consists of nothing more than a wifi adapter to control a bluetooth device?

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• What poor management decisions have you had to deal with?

  - by tombull89

  As a junior technician I've had to deal with (or will have to deal with) some problems in the past and only being a junior technician I don't have the confidence or respect from management staff to speak up. For instance, we're having a entirely new system. From Windows Server 2003/XP going to Windows Server 2008 R2/Windows 7/VMWare/Digital Signage and the current amount of time dedicated to the training of the IT support department currently stands at 0. They seem to think that all IT systems are the same and are going to get a bit of shock when I can't help them. I think there;s some UK legislation saying a school/business have to put money and time aside for training, but I'm not sure. What have you had to deal with?

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• TCP 30 small packets per second flood connection with server

  - by Denis Ermolin

  I'm testing connection with flash client and cloud server(boost::asio for software) over TCP connection. My connection with server already is really poor - 120 ms ping in average. I found when i start to send packets with 2 bytes size (without tcp header) with speed 30 packets/s - ping grow to 170-200 average. I think that it's really bad and my bad connection and bad cloud provider is reason for this high ping without any load. What do you think? (I tested my software - it can compute about 50k small packets/s so software is not a problem). I measure my ping through flash client - send packet with timestamp and immediatly send from server to client.

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• How to use ssh-agent (and graphic passphrase dialog) in Kubuntu 10.10?

  - by halo

  I have recently switched from Ubuntu to kubuntu, both version 10.10. Unfortunately in KDE the ssh passphrase dialog doesn't work out of the box. Everytime my ssh private key is used I need to enter my password. This is neither secure nor comfortable. I have done comprehensive research on the net but only found out dated documentation. Several things I tried didn't work out. Current status: SSH setup working with direct passphrase input ssh-agent running in X session $SSH_AUTH_SOCK set to ssh-agent's socket in X session How to enable ssh-agent for keeping the passphrase in memory for ~15mins and as a bonus always use a graphical dialog for its input? I use asymmetric SSH key pairs for pushing/pulling in Git VCS logging remotely into different server systems

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• How can I get rsync to ignore missing files?

  - by Joe Casadonte

  I'm executing a command like the following to several different systems: $ rsync -a -v [email protected]:'/path/to/first/*.log path/to/second.txt' /dest/folder/0007/. Sometimes *.log does not exist, and that's OK, but rsync generates the following error: receiving file list ... rsync: link_stat "/path/to/first/*.log" failed: No such file or directory (2) done Is there any way to suppress that? The only way I can think of is to use include and exclude filters, which just seem a PITA to me. Thanks!

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• SQL server availability issue: large query stops other connections from connecting

  - by Carlos

  I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the DBs, and the code seems to work fine. However, sometimes when one of my colleagues does a huge query against one of the other DBs, I see full CPU usage on the machine, and connections from my app time out. Why does this happen? I would have thought the many cores and harddisks would somehow (together with cleverly written DB server) be able to keep at least some of the resources free for other apps? I'm pretty sure he doesn't use multiple connections for his query. What can I do to prevent this?

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• GRUB2 Boot Configuration

  - by MA1

  Recently i installed GRUB2, everything is working fine. When my system is started my monitor is showing something like the following "Minimal BASH-Like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename." Press "Esc" key to enter the menu. Boot windows... and when i press the Esc key it then shows the GRUB2 menu showing list of operating systems installed on my system How the remove "Minimal BASH-Like line editing ...." text. I only need this line Press "Esc" key to enter the menu. Boot windows... Note: Both my WindowsXP and Fedora12 are working fine and loading with no problem.

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• Why do some machines respond with many RST packets instead of RST-ACK to refuse a connection?

  - by Michael J. Gray

  I have recently been trying to track down a problem with one of our systems and have noticed that it is simply not allowed to connect to a remote machine. However, the remote machine (not controlled by us) is responding to our request for a connection with many TCP RST packets on a different port (26469, 26497, 26498) than the one we originated on (53). It simply wouldn't let up at one point and flooded us with about 10 packets/second for an hour or two of only RST on those obscure high ports. Out of the thousands of nodes we're connecting to, this is the only one ever to show this behavior. What could possibly cause this? EDIT Below is a screenshot of Wireshark when it happened. I don't have the actual dump anymore and can't reproduce this specific scenario every time. Basically, we sent a SYN and immediately got RST on an odd port and so we respond with RST and just keep going back and forth.

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• Crossplatform "jail" for an application

  - by Alexander

  We currently have a variety of systems (Linux, Solarix, *BSD, HP-UX ...) on which we are not allowed to install anything into / (but I have root access. That's strange, I know). But we'd like to run Puppet on all of them. So, the obvious idea is to install Puppet with all prebuilt dependencies into some isolated tree, something like "jail", which will allow to use dependences from some prefix and to access the host system. The big advatanges would be uniform deployment and updates. One solution that came to my mind is to deploy Gentoo Prefix, and install Puppet there with package manager. However, this requires a lot of extra space and some manual patching for each system. Maybe there are some more elegant and simple solutions?

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• Access a windows dynamic hard drive through a virtual machine on ubuntu?

  - by Enigma

  I have a Windows 7 OS and am thinking about transitioning to a dual boot set up with Ubuntu 12.04. From what I recall, it is not possible to natively access Dynamic Windows Partitions in a Linux OS. My thought is that it might be possible to have a virtual machine (running windows) installed within Ubuntu access the physical dynamic drive. The problem comes to whether VMWare can access the physical disk "high enough" to be able to mount it within the windows virtual machine as a native device or if it gets passed through from the native Linux OS. This is really the only thing holding me back from switching to a dual-boot set up as the dynamic disk is made up of 4 or 5 hard drives and I would very much like access to the data on both OS's. Alternatively, is there another solution for combining multiple physical hard drives into one virtual hard drive that would be readable on both OS's?

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• Create a dependent drop down list in a single cell in Excel

  - by Larry Anderson

  I am trying to create a dependent drop down list for a High School. The User will select cell A1, Click on Hallway 3(for example), then the user will click on cell A1 again and then select the Room #, 325 (for example). The final result should be that cell A1 shows 325. I can create the first drop down list, but the second part is where I am having great trouble. I am using Excel 2010. Any help would be appreciated. Thanks

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• Using iTunes within Terminal Services 2008 R2 - Pitfalls etc

  - by Kristiaan

  I was hoping to get some further information on any possible Do's and Don't when it comes to installing, using and maintaining iTunes within a Termina Server environment. We have come across a situation in our company whereby some of our users who are using thin clients now need the ability to sync, update and manage their devices, previously they used either standard desktop systems or laptops so there was no issue with running iTunes. I have not found much information on the web about using iTunes within a Terminal Server Farm, Id like to find out if iTunes works within the environment, any known or common issues that occur due to running it like this.

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• Exchange 2003 Event ID 9337 - Offline Address Book

  - by Creepycc

  I have a support issue with an Exchange 2003 SP2 server. Event ID: 9337 Description: OALGen did not find any recipients in address list '\Global Address List'. This offline address list will not be generated. - Default Offline Address List When you preview the Global Address list within Exchange Systems Manager all is fine. Turning off cached mode on Outllok clients still errors Public fiolders / System folders are fine OABINTEG detects no issues, Pfdavadmin has checked all DACL The GAL and OAB have been deleted / recreated several times (With differnt names) DCDIAG, NETDIAG, ExchangeBPA all run without error Exhausted Google links diagnosing this issue, any suggestions?

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• Is it safe to change the time on hosting VM server?

  - by hydroparadise

  So, I noticed there's about a 10 minute drift on my VM hosting server from what time it's supposed to be. In traditional environments, I would just restart the system (and change the BIOS time if necassary). The hosting server is Ubuntu 12.04. Undertsanding that some process could be time sensitive (NTP?), I was wondering how this might affect the relation between the host and hosted system (currently hosting 4: 3 Ubuntu 12.04 servers with one being a web server, and 1 Windows Server 2008 file server). I am using Virtual Box 4 with it's headless option. Ultimately, I am trying to avoid from shutting down the host (which ultimately mean shutthing down the other hosted systems). Is this safe?

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• Any ramifications to disabling ClearPageFile

  - by user34710

  I am runing a Dell XPS 15z with a quad core I7, 8gb ram, 7200rpm hdd, windows 7 ultimate. My laptop was taking around 3 minutes to shut down, which seemed far too high to me. I did a bit of investigation, and it seemed that the ClearPageFile reg entry was set to 1, meaning that upon shutdown my pagefile.sys was being cleared before actually shutting the machine down. When I disable this setting, my laptop shuts down in about 20 seconds - clearly a big gain. My question is, are there any side effects of having this turned off (other than the security risk of the HDD being stolen, and still having any important info that was in the RAM up for grabs)?

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• How to find malicious IPs?

  - by alfish

  Cacti shows irregular and pretty steady high bandwidth to my server (40x the normal) so I guess the server is udnder some sort of DDoS attack. The incoming bandwidth has not paralyzed my server, but of course consuming the bandwidth and affects performance so I am keen to figure out the possible culprits IPs add them to my deny list or otherwise counter them. When I run: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n I get a long list of IPs with up to 400 connections each. I checked the most numerous occurring IPs but they come from my CDN. So I am wondering what is the best way to help monitor the requests that each IP make in order to pinpoint the malicious ones. I am using Ubuntu server. Thanks

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• Issue with broken disk on Solaris with raidctl - how to proceed

  - by weismat

  I have a SunFire T2000 server which has 2 mirrored disks pairs. The server required an exchange of the system battery. After swaping the battery first no disks were found. After booting from CD we managed to find the disks, but now one disk is broken and the raidctl reports a failed synchronisation. The boot process stops now when trying to mount the file systems. The power light of the broken drive is not even blinking. What is the best way to proceed now ? Fortunately I could live with loosing the data on the drive as it is backed up, but I would like to keep the rest of the data as it contains /etc and get the server booting again.

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• Suggestions for someone wanting to become a Laptop Reseller

  - by Josh B.

  First of all, to give you a little background... I have had my Microsoft A+ for several years now. I used to run a small business repairing Xbox 360 consoles and I am currently a Network Engineer for a company in Ohio. I definitely know my way around a computer. I miss running a small business on the side and I'd like to get something going again. There is a really high demand in my area for Laptops and I was thinking about starting a small Laptop store out of my house. What is the best way to do this? I was assuming that the best way would be to buy barebones systems and build them yourself. If this is the best method, I would be very interested in any resources to get parts and such. Apparently Laptop parts aren't the easiest thing to come by (especially at a good price). Does anyone have any suggestions about how to get something like this going?

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• Tests for hard drive health

  - by Samik R

  I have a 5-year old hard drive (bought new at the time), but it was sitting in my closet for 5 years, unused. I have just started using it, and seems to be getting a whirring sound (rather distinct from the other noises like fans etc.). I ran a few diagnostics tests, like Seagate's SeaTools, and the SMART test, and a few generic tests and all passed. Should I be concerned? Is there any other test that I should run? It's an internal IDE WD 5400RPM drive. Being used for a desktop, which is itself pretty high-end (AMD Phenom II X6 1100T, AMD Radeon GPU etc.), but would be used rather occasionally to begin with (avg. 1-2 hrs. per day). Thanks for any pointers.

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• How SSD's drives reduce their latency?

  - by tigrou

  First time i read some information about SSD's, i was surprised to learn they internally use NAND flash chips. This kind of memory is generally slow (low bandwidth) and have high latency while SSD's are just the opposite. But here is how it works : SSD drives increase their bandwidth by using several NAND flash chips in parallel. In other words, they do some data striping (aka RAID0) across several chips (done by the controller). What i don't understand is how SSD's drives managed to reduce latency? (or at least lot better than what a single NAND chip without any controller can do)

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• better options for screen?

  - by lonestar21

  OK. So I love screen. It has saved my bacon a few times when machines crash or get disconnected from the network. However, there are enough reasons keep keep me from using screen for everything, which include: Pain in the butt scrolling. Why can't I just interact as though this is a normal bash shell? My keyboard shortcuts are gone. I have a number of things customized in my bash environment, is there a way to get them to work in screen as well? Are there any tools our tips that I can use to make my screen-using experience as high quality as my bash using experience?

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• Windows 8 Color Settings (Window Title)

  - by xixixao

  In Windows 7, the window title's color (by default black, to see the title in the title bar fire up Windows Media Player for example) is stored in [HKEY_CURRENT_USER\Control Panel\Desktop\Colors] TitleText value. This is not the case in Windows 8, since this value is only used when using high contrast theme. It looks like noone has come up with a way to change this color yet, so my question is, where to look? What tools can I use to see dependencies, what could be the way to find this value (I rightfully hope it's not a constant in code).

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• gunzip unexpected end of file

  - by Mark J Seger

  I like to write high volume data directly to a zip file via perl. Works like a champ! However, on some rare occasions I've found that gunzip can't uncompress them declaring an unexpected end-of-file. The thing is I can uncompress it with a simple perl script, which probably misses the corrupted record(s) at the end. My question is, does anyone know of a way to use a standard utility to do the same thing? Maybe with a 'compress-as-much-as-you-can' switch? -mark

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• How long until the chirping stops or what can I do to make it stop?

  - by MadBurn

  I know computers, I have been fixing them and building them for over a decade... but I don't know the exact electronics of them. My personal desktop PC is making an irregular, but constant, extremely high pitched chirping noise. I know this could be my hard drive, but I've heard that noise before and I believe this is a capacitor or part of the electronics. This noise is right at the edge of my hearing and I can feel it more than I can hear it. After a while, it starts to give me a headache and makes me physically sick. How long will this last? Is there anything I can do to fix it (short of replacing the entire motherboard)?

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• Can the traditional remote desktop client be accessed in Windows RT?

  - by nhinkle

  As mentioned in another question, I've been unable to connect through the Remote Desktop metro app to some computers, in particular those requiring VPN access or load balancers. I'm considering purchasing a Microsoft Surface RT, but given that the app store hasn't matured significantly yet and some niche software will likely never be ported to the Modern UI, I must have acess to remote systems somehow. Until Citrix fixes the receiver app for Windows 8, I'm stuck using remote desktop. Which doesn't work. I've heard that Windows RT comes with some of the Microsoft desktop programs built in, like Microsoft Office and File Explorer. Is the "normal" Remote Desktop Connection program available in Windows RT, and if so, is it 100% compatible with previous versions?

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