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• Count Items in Access 2003

  - by Anna

  I have a table which contains a column with different items which i would like to count by there type. For example the table looks like the following: Id Type 1 Table 2 Table 3 TV 4 TV 5 Table 6 TV 7 TV The result should looks like: Type NumOfItems Table 3 TV 4 I use the following code which doesn't work for my Access 2003: SELECT Table1.Type, Count(Table1.Type) AS NumOfItems FROM Table1

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• Persistent Issues on small business network using Cisco 871W and Catalyst Express 500

  - by Ben Campbell

  Being the most qualified (read: still not qualified) to solve our persistant network issues, I've turned to serverfault for guidance. I've done some searching, reading related documentation on cisco.com and tried a bit of troubleshooting. Here is the config: 100mb synchronous connection from a business internet provider (tested multiple times at 100meg at the source) Cisco 871W wireless point & router is where the WAN connection starts (this serves all our wireless). The only wired connection in the 871W is the Catalyst switch listed below. Cisco Catalyst Express 500 (24TT) is where all the wired connections terminate. About 20 Windows workstations and servers (AD/Webservers only). Some services in EC2 including mail and other web servers/apps. I've been TOLD cabling internally should be gigabit-ready. Here are the problems: generally slow download rates from the internet to the desktop/laptop frequent "page cannot be displayed" errors in browsers-sometimes 3 or 4 reloads are necessary... often times CSS wont load or other content requiring the browser to connect to a different server. slow speed within the LAN from workstation to workstation copying files. I would expect extremely fast data transfer workstation to workstation / server to workstation in this simple network. Several things I need to admit: I'm not primarily a network guy. Funding is relatively low, I need to be the guy that finds the solution. I understand most of the terminology and most of the technology. Implementation is where I fail due to lack of experience. Getting to the point: I'm wondering whether experienced network admins think that our small network should be sufficiently served with our current hardware if configured properly... or if we should purchase new equipment and start fresh? If starting fresh is the plan, whatever that new equipment may be is a likely different question entirely. If I haven't provided enough information, I will happily do some troubleshooting and update with the results. I have experience using wireshark and some other tools. Please let me know what you think would be most helpful and thanks in advance. EDIT: I forgot to add that the Cisco applicance will not finish loading the SDM Express console. It hangs every time at the "populating modules... DHCP". It eventually crashes and closes. I've rebooted the hardware and this still happens.

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• config a router to act as a client and access another wireless router/network, wag120n

  - by mihai

  I currently have a WAG120N( http://www.linksysbycisco.com/EU/en/support/WAG120N) router and I would like to know if it's possible to configure it to connect to a different wireless network(WEP with no password) so I can get internet access on it and then to connect a pc to this router(WAG120N) so I can take advantage of the internet connection. Basically I think that my need is a kind of yagi antenna but as I already got this router I would like to know if I can use instead it of yagi . Thank you in advance for any answer !

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• Redirecting a port to a remote server on windows

  - by Chris T

  I only have command line access to a server and I'm not allowed to disable the antivirus (which blocks netcat). What I would like to do is have a program that listens on port A and when a remote computer connects to it redirect all input/output of that socket to another server on a different port. Basically a small proxy. Is there anything that will let me do this from command line? If not I could try coding something simple that does this with C++

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• Vista home basic, "this folder is empty" problem

  - by peter m

  When I access my itunes folder in "my music" I see most but not all artist folders, when I access any of them I get "this folder is empty", When in Itunes all music plays and if I right click on a song and click show in folder I can see my full Itunes folder, so far I have done two system restores, scan disk, windows memory scan, defrag and tried ifixit. nothing has worked, I dont understand how I can see two different folders at the same address. Also have checked hidden files settings.

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• Server unresponsive after successful OpenSSL connection

  - by Dan B

  I'm testing server connections using OpenSSL, with varying results Server A: connection is successful, as are user login and the other commands I expected to work Server B: connection is successful, but the server is unresponsive when I try to submit a command. I don't get an error, or even a disconnection – just a blank line from where I hit Enter or ^M My hunch is that Server B's configuration requires a different character encoding or something and it's simply not recognizing my Enter keystroke, but I've looked to no avail... any suggestions would be appreciated!

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• Sharing Bandwidth and Prioritizing Realtime Traffic via HTB, Which Scenario Works Better?

  - by Mecki

  I would like to add some kind of traffic management to our Internet line. After reading a lot of documentation, I think HFSC is too complicated for me (I don't understand all the curves stuff, I'm afraid I will never get it right), CBQ is not recommend, and basically HTB is the way to go for most people. Our internal network has three "segments" and I'd like to share bandwidth more or less equally between those (at least in the beginning). Further I must prioritize traffic according to at least three kinds of traffic (realtime traffic, standard traffic, and bulk traffic). The bandwidth sharing is not as important as the fact that realtime traffic should always be treated as premium traffic whenever possible, but of course no other traffic class may starve either. The question is, what makes more sense and also guarantees better realtime throughput: Creating one class per segment, each having the same rate (priority doesn't matter for classes that are no leaves according to HTB developer) and each of these classes has three sub-classes (leaves) for the 3 priority levels (with different priorities and different rates). Having one class per priority level on top, each having a different rate (again priority won't matter) and each having 3 sub-classes, one per segment, whereas all 3 in the realtime class have highest prio, lowest prio in the bulk class, and so on. I'll try to make this more clear with the following ASCII art image: Case 1: root --+--> Segment A | +--> High Prio | +--> Normal Prio | +--> Low Prio | +--> Segment B | +--> High Prio | +--> Normal Prio | +--> Low Prio | +--> Segment C +--> High Prio +--> Normal Prio +--> Low Prio Case 2: root --+--> High Prio | +--> Segment A | +--> Segment B | +--> Segment C | +--> Normal Prio | +--> Segment A | +--> Segment B | +--> Segment C | +--> Low Prio +--> Segment A +--> Segment B +--> Segment C Case 1 Seems like the way most people would do it, but unless I don't read the HTB implementation details correctly, Case 2 may offer better prioritizing. The HTB manual says, that if a class has hit its rate, it may borrow from its parent and when borrowing, classes with higher priority always get bandwidth offered first. However, it also says that classes having bandwidth available on a lower tree-level are always preferred to those on a higher tree level, regardless of priority. Let's assume the following situation: Segment C is not sending any traffic. Segment A is only sending realtime traffic, as fast as it can (enough to saturate the link alone) and Segment B is only sending bulk traffic, as fast as it can (again, enough to saturate the full link alone). What will happen? Case 1: Segment A-High Prio and Segment B-Low Prio both have packets to send, since A-High Prio has the higher priority, it will always be scheduled first, till it hits its rate. Now it tries to borrow from Segment A, but since Segment A is on a higher level and Segment B-Low Prio has not yet hit its rate, this class is now served first, till it also hits the rate and wants to borrow from Segment B. Once both have hit their rates, both are on the same level again and now Segment A-High Prio is going to win again, until it hits the rate of Segment A. Now it tries to borrow from root (which has plenty of traffic spare, as Segment C is not using any of its guaranteed traffic), but again, it has to wait for Segment B-Low Prio to also reach the root level. Once that happens, priority is taken into account again and this time Segment A-High Prio will get all the bandwidth left over from Segment C. Case 2: High Prio-Segment A and Low Prio-Segment B both have packets to send, again High Prio-Segment A is going to win as it has the higher priority. Once it hits its rate, it tries to borrow from High Prio, which has bandwidth spare, but being on a higher level, it has to wait for Low Prio-Segment B again to also hit its rate. Once both have hit their rate and both have to borrow, High Prio-Segment A will win again until it hits the rate of the High Prio class. Once that happens, it tries to borrow from root, which has again plenty of bandwidth left (all bandwidth of Normal Prio is unused at the moment), but it has to wait again until Low Prio-Segment B hits the rate limit of the Low Prio class and also tries to borrow from root. Finally both classes try to borrow from root, priority is taken into account, and High Prio-Segment A gets all bandwidth root has left over. Both cases seem sub-optimal, as either way realtime traffic sometimes has to wait for bulk traffic, even though there is plenty of bandwidth left it could borrow. However, in case 2 it seems like the realtime traffic has to wait less than in case 1, since it only has to wait till the bulk traffic rate is hit, which is most likely less than the rate of a whole segment (and in case 1 that is the rate it has to wait for). Or am I totally wrong here? I thought about even simpler setups, using a priority qdisc. But priority queues have the big problem that they cause starvation if they are not somehow limited. Starvation is not acceptable. Of course one can put a TBF (Token Bucket Filter) into each priority class to limit the rate and thus avoid starvation, but when doing so, a single priority class cannot saturate the link on its own any longer, even if all other priority classes are empty, the TBF will prevent that from happening. And this is also sub-optimal, since why wouldn't a class get 100% of the line's bandwidth if no other class needs any of it at the moment? Any comments or ideas regarding this setup? It seems so hard to do using standard tc qdiscs. As a programmer it was such an easy task if I could simply write my own scheduler (which I'm not allowed to do).

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• Is there a reason to use library backups if I'm backup up full disks?

  - by Ben Brocka

  In Windows Backup I can backup libraries or whole drives (or specific folders). I want a complete backup of all relevant drives. After selecting the drives, there's still the option to backup libraries: Is the backup going to do anything different if I include libraries as well as drives? Should I just backup the whole drive instead? Space used by the backup shouldn't be an issue, since I know the incremental backup is pretty smart..

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• some clarification on accept field in http request

  - by Salvador Dali

  Can anyone enlighten me on the following question: What do different fields in accept field in HTTP request mean? I can understand the basics that through accept the client is telling the server what type of information it is waiting to receive, so for example: Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 This way the client will tell the server that it can understand three following formats: text/html application/xhtml+xml application/xml But can someone tell me what this q values mean and that / Also if I have any flaws in my understanding - please tell me.

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• iChat or Gtalk won't connect to AIM. How can I fix this?

  - by classicrock985

  I can sign onto AIM.com and I know my account is active because I can sign in on my iPhone or AIM express. I can't however log in using any 3rd part applications. I've tried logging in using Adium, iChat, and Gmail Chat (Gchat) I have tried to change my port to "443" and changed the server name to something different. This is so weird. Any suggestions??

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• Pidgin to pidgin, what protocol to chose?

  - by Johan

  Hi I and a friend need to start to use some instant messaging and it seem like pidgin is a nice program to use. However it supports quite a lot of different protocols. So my question is witch to choose? Since both parties can use the same program we don't have to use the same protocol as "all the rest", but can focus on what is best to use. As a side note both parties will be using Ubuntu based computers. Thanks Johan

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• ZigBee Maximum Bandwidth

  - by Kris

  What is the maximum rated bandwidth for ZigBee? I can't seem to find this information anywhere, not even on the ZigBee Alliance website at http://www.zigbee.org/ I did find some information elsewhere, but it dated back to 2004, so I'm guessing it's different now that it was 5 years ago. Thanks!

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• Script Editor in Snow Leopard painfully slow after adding apps to Library

  - by Kio Dane

  I have four different Macs that I use from time to time, and on each of them I notice a constant: adding more items to AppleScript Editor's Library window slows performance of mundane operations (opening a dictionary, switching between Library window and editor window, scrolling in the Library window, etc). In Leopard, I noticed little to no latency in opening a dictionary in Script Editor, but Snow Leopard's AppleScript Editor kills my productivity by making me wait on it with most UI interactions with the Library window.

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• Ubuntu 9.1 - Audio coming from both speakers and headphones

  - by David

  I have an HP Compaq nc8230 that has an annoying little problem with it's audio devices in Ubuntu 9.1. When I have the headphones plugged in, the audio continues to play simultaneously through the speakers no matter what. I'm not sure what kind of sound card this computer has, but in WIndows XP, Vista, 7 and OSx86 I didn't have this problem. I've tried using 3 different headphones and it didn't change anything. Please help.

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• asking for solution for move site from one server to another server

  - by George2

  Hello everyone, I am using SharePoint Server Enterprise 2007 with Windows Server 2008 Enterprise. I have a site collection which is using 3 types of sites publishing portal/wiki/blog. I want to move the template (e.g. master pages) and data from one server to another. Server domain names and IP address are different. What is the suggested way to do this task? thanks in advance, George

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• Safari can’t establish a secure connection to the server

  - by gdelfino

  I realize there is another question with the same title, but my situation is very different. The problem started on three of my computers after upgrading from Leopard to Snow Leopard. I can login to gmail and facebook using https with no problem. I can not login to https://identi.ca/main/login or https://seminars.wolfram.com/ or https://panopticlick.eff.org with Safari, works fine with Firefox. Already tried "Safari Reset..." Any ideas?

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• How do I get the line of a javascript error in a Chrome Web Developer stack trace?

  - by David Faux

  Using Chrome Web Developer, I am analyzing a complex web page linking many javascript files. Web Developer console notes that there is a bug in the javascript. I click on the bug notice in the console, which leads me to a line in a javascript file that I have no control over and did not code. However, I want to trace this error to a line of javascript that I did write in a different file. How do I do that?

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• Using hdparm for better performance on Web Servers

  - by Rishav

  I just heard about using hdparams to optimize the Hard Disk Performance of a server ? Is this common practice ? What file systems do you use ? I generally deploy on the second last release of Ubuntu for stability reasons, do you some other filesystems or use distributed file systems from the get go ? Do the hdparam settings change for different File systems ? I haven't tried this yet, so how much difference do changes like this make ?

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• Issue with VMWare vSphere and NFS: re occurring apd state

  - by Bastian N.

  I am experiencing issues with VMWare vSphere 5.1 and NFS storage on 2 different setups, which result in an "All Path Down" state for the NFS shares. This first happened once or twice a day, but lately it occurs much more frequent, as specially when Acronis Backup jobs are running. Setup 1 (Production): 2 ESXi 5.1 hosts (Essentials Plus) + OpenFiler with NFS as storage Setup 2 (Lab): 1 ESXi 5.1 host + Ubuntu 12.04 LTS with NFS as storage Here is an example from the vmkernel.log: 2013-05-28T08:07:33.479Z cpu0:2054)StorageApdHandler: 248: APD Timer started for ident [987c2dd0-02658e1e] 2013-05-28T08:07:33.479Z cpu0:2054)StorageApdHandler: 395: Device or filesystem with identifier [987c2dd0-02658e1e] has entered the All Paths Down state. 2013-05-28T08:07:33.479Z cpu0:2054)StorageApdHandler: 846: APD Start for ident [987c2dd0-02658e1e]! 2013-05-28T08:07:37.485Z cpu0:2052)NFSLock: 610: Stop accessing fd 0x410007e4cf28 3 2013-05-28T08:07:37.485Z cpu0:2052)NFSLock: 610: Stop accessing fd 0x410007e4d0e8 3 2013-05-28T08:07:41.280Z cpu1:2049)StorageApdHandler: 277: APD Timer killed for ident [987c2dd0-02658e1e] 2013-05-28T08:07:41.280Z cpu1:2049)StorageApdHandler: 402: Device or filesystem with identifier [987c2dd0-02658e1e] has exited the All Paths Down state. 2013-05-28T08:07:41.281Z cpu1:2049)StorageApdHandler: 902: APD Exit for ident [987c2dd0-02658e1e]! 2013-05-28T08:07:52.300Z cpu1:3679)NFSLock: 570: Start accessing fd 0x410007e4d0e8 again 2013-05-28T08:07:52.300Z cpu1:3679)NFSLock: 570: Start accessing fd 0x410007e4cf28 again As long as the issue occurred once or twice a day it really wasn't a problem, but now this issue has impact on the VMs. The VMs get slow or even hang, resulting in a reset through vCenter in the production environment. I searched the web extensively and asked in forums, but till now nobody was able to help me. Based on blog posts and VMWare KB articles I tried the following NFS settings: Net.TcpipHeapSize = 32 Net.TcpipHeapMax = 128 NFS.HartbeatFrequency = 12 NFS.HartbeatMaxFailures = 10 NFS.HartbeatTimeout = 5 NFS.MaxQueueDepth = 64 Instead of NFS.MaxQueueDepth = 64 I already tried other settings like NFS.MaxQueueDepth = 32 or even NFS.MaxQueueDepth = 1. Unfortunately without any luck. It would be great if someone could help me on this issue. It is really annoying. Thanks in advance for all the help. [UPDATE] As I explained in the comment below, here is the network setup: On the production setup the NFS traffic is bound to a separate VLAN with ID 20. I am using a HP 1810 24 Port Switch. The OpenFiler system is connected to the VLAN with 4 Intel GbE NICs with dynamic LACP. The ESXis both have 4 Intel GbE NICs using 2 static LACP trunks containing 2 NICs each. One pair is connected to the regular LAN and the other one to the VLAN 20. And here is a screenshot of the vSwitch: Switch configuration: Port configuration: On the lab setup its a single Intel NIC on each side without VLAN, but with different IP subnet.

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• Does RVM "failover" to another ruby instance on error?

  - by JohnMetta

  Have a strange problem in that I have a Rake task that seems to be using multiple versions of Ruby. When one fails, it seems to try another one. Details MacBook running 10.6.5 rvm 1.1.0 Rubies: 1.8.7-p302, ree-1.8.7-2010.02, ruby-1.9.2-p0 Rake 0.8.7 Gem 1.3.7 Veewee (provisioning Virtual Machines using Opcode.com, Vagrant and Chef) I'm not entirely sure the specific details of the error matter, but since it might be an issue with Veewee itself. So, what I'm trying to do is build a new box base on a veewee definition. The command fails with an error about a missing method- but what's interesting is how it fails. Errors I managed to figure out that if I only have one Ruby installed with RVM, it just fails. If I have more than one Ruby install, it fails at the same place, but execution seems to continue in another interpreter. Here are two different clipped console outputs. I've clipped them for size. The full outputs of each error are available as a gist. One Ruby version installed Here is the command run when I only have a single version of Ruby (1.8.7) available in RVM boudica:veewee john$ rvm rake build['mettabox'] --trace rvm 1.1.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build … creating new harddrive rake aborted! undefined method `max_vdi_size' for #<VirtualBox::SystemProperties:0x102d6af80> /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/virtualbox-0.8.3/lib/virtualbox/abstract_model/dirty.rb:172:in `method_missing' <------ stacktraces cut ----------> /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19 Multiple Ruby Versions Here is the same command run with three versions of Ruby available in RVM. Prior to doing this, I used "rvm use 1.8.7." Again, I don't know how important the details of the specific errors are- what's interesting to me is that there are three separate errors- each with it's own stacktrace- and each in a different Ruby interpreter. Look at the bottom of each stacktrace and you'll see that they are all sourced from different interpreter locations- First ree-1.8.7, then ruby-1.8.7, then ruby-1.9.2: boudica:veewee john$ rvm rake build['mettabox'] --trace rvm 1.1.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build … creating new harddrive rake aborted! undefined method `max_vdi_size' for #<VirtualBox::SystemProperties:0x1059dd608> /Users/john/.rvm/gems/ree-1.8.7-2010.02/gems/virtualbox-0.8.3/lib/virtualbox/abstract_model/dirty.rb:172:in `method_missing' … /Users/john/.rvm/gems/ree-1.8.7-2010.02/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ree-1.8.7-2010.02@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ree-1.8.7-2010.02@global/bin/rake:19 (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build isofile ubuntu-10.04.1-server-amd64.iso is available ["a1b857f92eecaf9f0a31ecfc39dee906", "30b5c6fdddbfe7b397fe506400be698d"] [] Last good state: -1 Current step: 0 last good state -1 destroying machine+disks (re-)executing step 0-initial-a1b857f92eecaf9f0a31ecfc39dee906 VBoxManage: error: Machine settings file '/Users/john/VirtualBox VMs/mettabox/mettabox.vbox' already exists VBoxManage: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component Machine, interface IMachine, callee nsISupports Context: "CreateMachine(bstrSettingsFile.raw(), name.raw(), osTypeId.raw(), Guid(id).toUtf16().raw(), FALSE , machine.asOutParam())" at line 247 of file VBoxManageMisc.cpp rake aborted! undefined method `memory_size=' for nil:NilClass /Users/john/Work/veewee/lib/veewee/session.rb:303:in `create_vm' /Users/john/Work/veewee/lib/veewee/session.rb:166:in `build' /Users/john/Work/veewee/lib/veewee/session.rb:560:in `transaction' /Users/john/Work/veewee/lib/veewee/session.rb:163:in `build' /Users/john/Work/veewee/Rakefile:87 /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:636:in `call' /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:631:in `each' … /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19 (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build isofile ubuntu-10.04.1-server-amd64.iso is available ["a9c4ab3257e1da3479c984eae9905c2a", "30b5c6fdddbfe7b397fe506400be698d"] [] Last good state: -1 Current step: 0 last good state -1 (re-)executing step 0-initial-a9c4ab3257e1da3479c984eae9905c2a VBoxManage: error: Machine settings file '/Users/john/VirtualBox VMs/mettabox/mettabox.vbox' already exists VBoxManage: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component Machine, interface IMachine, callee nsISupports Context: "CreateMachine(bstrSettingsFile.raw(), name.raw(), osTypeId.raw(), Guid(id).toUtf16().raw(), FALSE , machine.asOutParam())" at line 247 of file VBoxManageMisc.cpp rake aborted! undefined method `memory_size=' for nil:NilClass /Users/john/Work/veewee/lib/veewee/session.rb:303:in `create_vm' /Users/john/Work/veewee/lib/veewee/session.rb:166:in `block in build' /Users/john/Work/veewee/lib/veewee/session.rb:560:in `transaction' /Users/john/Work/veewee/lib/veewee/session.rb:163:in `build' /Users/john/Work/veewee/Rakefile:87:in `block in <top (required)>' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:634:in `call' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:634:in `block in execute' … /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:2013:in `top_level' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:1992:in `run' /Users/john/.rvm/rubies/ruby-1.9.2-p0/bin/rake:35:in `<main>' It isn't until we reach the last installed version of Ruby that execution halts. Discussion Does anyone have any idea what's going on here? Has anyone seen this "failover"-like behavior before? It seems strange to me that the first exception would not halt execution as it did with one interpreter, but I wonder if there are things happening when RVM is installed that we Ruby developers are not considering.

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• Is it possible to set the date on a Linux machine to the year 2040?

  - by Daryl Spitzer

  I need to be able to set the date on Ubuntu (8.04.4 LTS) to the year 2040 (to test something that isn't relevant to this question). Is that possible? I can run: $ sudo date -s "15 JAN 2038 18:00:00" Fri Jan 15 18:00:00 PST 2038 ...but: $ sudo date -s "15 JAN 2039 18:00:00" date: invalid date `15 JAN 2039 18:00:00' Is the limit somewhere in 2038 (or prior to Jan. 15, 2039)? Does this change with different versions of Linux?

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• The public link of dropbox doesn't work

  - by user828896

  Recently, I find the public link of dropbox such as https://dl.dropboxusercontent.com/u/209352/Temp/Mycss.PNG don't work sometimes. I have to use share dropbox link such as https://www.dropbox.com/s/nr4bb00sd80pgl9/Mycss.PNG It seems that share dropbox link works well. Could tell me what is different between public link and share dropbox link? Can I always use share dropbox link instead of public link ?

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• Does DKIM works with subdomains?

  - by Feelsgoodman

  ISP's recommend you segment your marketing and transactional emails by using different IPs. I want to start using DKIM, but since DKIM is a domain based reputation system I wonder if signing with the same company.com domain will impact the reputation of transactional emails, since both them and marketing will be signed with the same domain? Is using DKIM with subdomains possible? Would something like this: bulk.company.com and transactional.company.com be a good idea? Thanks!

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• Biometric access control for time-reporting system

  - by dam

  I made a simple REST application to control the presence of workers. Now I'm looking for an inexpensive (100-250$) hardware, possibly linux based, with a fingerprint reader from which I can perform the user authentication and interact with the application (both the activities) via REST. I saw hundreds of different devices on internet which are supposed to do these activities but there are no good datasheets for them and it's very difficult to understand what's possible to do with those devices. Do you have any suggestions for me? Thanks

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• perl hide system output

  - by Chris

  Using perl 5.8.8 on linux, need the output of a perl 'system' command to be hidden. The command in my code is : system("wget", "$url", "-Omy_folder/$date-$target.html", "--user-agent=$useragent"); I've tried using " /dev/null 2&1" in different places in the system command, like this- system("wget", "$url", "-Omy_folder/$date-$target.html", "--user-agent=$useragent"," /dev/null 2&1"); Can anyone help me with where the redirection to /dev/null should be?

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