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• OpenVPN performance: how many concurrent clients are possible?

  - by Steffen Müller

  I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server needs to be able to send commands to the clients. My first naive approach is to make the clients connect to the server via an openvpn network. This way, the secure communication tunnel can be used in both directions. This means that all clients are always connected to the server. There are many clients summing up over the years. The question is: does the OpenVPN server explode when reaching a certain number of clients? I am already aware of a maximum TCP connection number limit, therefore (and for other reasons) the VPN would have to use UDP transport. OpenVPN gurus, what is your opinion?

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• Restrict IPMI access on Dell BMC and iDRAC to an allowed IP range

  - by edgester

  I'm trying to secure the iDRAC's and BMC's on some of my Dell servers (R210, R410, R510). I want to restrict access to IPMI commands to only a few IP addresses. I've successfully restricted access to the iDrac using the instructions from http://support.dell.com/support/edocs/software/smdrac3/idrac/idrac10mono/en/ug/html/racugc2d.htm#wp1181529 , but the IP restrictions do not affect IPMI. A separate management network is not practical at this time because of lack or ports and some Dell BMC's don't offer a separate port. I'm told by my networking group that our switches don't support trunking, so using the vlan tagging is not an option either. Is there a way restrict the IPMI access to a list of allowed addresses? FYI, for various reasons, I have a mix of Dell servers with BMC's, iDrac Express and iDrac enterprise management features.

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• Synchronized Enumerator in C#

  - by Dan Bryant

  I'm putting together a custom SynchronizedCollection<T> class so that I can have a synchronized Observable collection for my WPF application. The synchronization is provided via a ReaderWriterLockSlim, which, for the most part, has been easy to apply. The case I'm having trouble with is how to provide thread-safe enumeration of the collection. I've created a custom IEnumerator<T> nested class that looks like this: private class SynchronizedEnumerator : IEnumerator<T> { private SynchronizedCollection<T> _collection; private int _currentIndex; internal SynchronizedEnumerator(SynchronizedCollection<T> collection) { _collection = collection; _collection._lock.EnterReadLock(); _currentIndex = -1; } #region IEnumerator<T> Members public T Current { get; private set;} #endregion #region IDisposable Members public void Dispose() { var collection = _collection; if (collection != null) collection._lock.ExitReadLock(); _collection = null; } #endregion #region IEnumerator Members object System.Collections.IEnumerator.Current { get { return Current; } } public bool MoveNext() { var collection = _collection; if (collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex++; if (_currentIndex >= collection.Count) { Current = default(T); return false; } Current = collection[_currentIndex]; return true; } public void Reset() { if (_collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex = -1; Current = default(T); } #endregion } My concern, however, is that if the Enumerator is not Disposed, the lock will never be released. In most use cases, this is not a problem, as foreach should properly call Dispose. It could be a problem, however, if a consumer retrieves an explicit Enumerator instance. Is my only option to document the class with a caveat implementer reminding the consumer to call Dispose if using the Enumerator explicitly or is there a way to safely release the lock during finalization? I'm thinking not, since the finalizer doesn't even run on the same thread, but I was curious if there other ways to improve this.

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• Nothing happens when trying to upgrade from Linux Mint 12 to 13

  - by Ares

  I am trying to upgrade from Linux Mint 12 to 13 using apt-get. After running the following commands, nothing seems to happen. I am fairly new to linux, what am I doing wrong? user@olympus /etc/default $ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. user@olympus /etc/default $ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

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• Forwarding MySQL connection with iptables and differents network interfaces

  - by Emilio Nicolás

  I have a PC with Ubuntu as a router. It has a 3G connection with a public IP to the Internet, and there is a private wireless subnet. So it has two active interfaces: ppp0: public IP (WAN) wlan0: private IP (LAN) With iptables I wannt to forward every MySQL connection (port 3306) to a local machine (10.42.43.10) of the subnet. I type these iptables commands: iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 3306 -j DNAT --to 10.42.43.10:3306 iptables -A FORWARD -p tcp -i ppp0 -o wlan0 -d 10.42.43.10 --dport 3306 -j ACCEPT But it doesn't work. telnet publicip 3306 fails :-( Any help will be appreciated. Thanks!

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• Installing sun-java6-jdk with apt-get on Ubuntu 10.04

  - by Adam S

  I have followed the instructions on numerous pages, such as this, which say to run the following commands: sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" sudo apt-get update sudo apt-get install sun-java6-jdk However, when I do this I still get the following error: me@mycomputer:~$ sudo apt-get install sun-java6-jdk Reading package lists... Done Building dependency tree Reading state information... Done Package sun-java6-jdk is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package sun-java6-jdk has no installation candidate I realize Java is available from many other sources, but for reasons that I can't get into here I must use this specific version. What can I do to get this installed?

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• problem connecting to datasource defined in freetds.conf

  - by pkaeding

  I can connect successfully to my database using tsql when I bypass the freetds.conf file, like so: % TDSVER=8.0 tsql -H 10.100.102.202 -p 1086 -U sa After I enter my password, I am presented with a 1> prompt, and it is ready for my commands. However, if I try to connect using the definition in my freetds.conf file, like this: % tsql -S Millie -U sa after entering my password, it seems to be trying to generate a prompt, but it just keeps counting. I will see 1, followed by 2, etc, without ever displaying a > character. Here is what I have for my freetds.conf: [global] # TDS protocol version tds version = 8.0 text size = 64512 [Millie] host = 10.100.102.202 port = 1086 What could be causing this anomaly? If it helps, here is the output of tsql -C: % tsql -C Compile-time settings (established with the "configure" script) Version: freetds v0.82 freetds.conf directory: /usr/local/etc MS db-lib source compatibility: no Sybase binary compatibility: no Thread safety: yes iconv library: yes TDS version: 5.0 iODBC: no unixodbc: no

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• setting up a shared folder in linux

  - by Chris

  I'm trying to set up a folder in my home directory that will be shared with another user but for some reason it is not working this is what I've done, I have tried two different ways using ACL's and chown/chgrp etc I set up a group called say: sharedgroup and added both my user (john) and fred to it so when I run groups john john wheel sharedgroup groups fred sharedgroup fred mkdir /home/john/shared vim /home/john/shared/hello.txt (typed in some text saved it) chown -R :sharedgroup shared chmod -R o=-rwx shared ll drwxrwx--- 2 john sharedgroup 4096 Sep 9 21:14 shared ll shared -rw-rw-r-- 1 john sharedgroup 7 Sep 9 21:14 hello.txt (I also tried adding in the s permissions but that didn't help either) then when I log out of the server and log back in as fred and try these commands they fail vim /home/john/shared/hello.txt (won't allow me to write opens a blank file) cd /home/john/shared -bash: cd: /home/john/cis: Permission Denied ls /home/john/shared -ls: /home/john/shared: Permission Denied ls -lad /home/john/shared -ls: /home/john/shared: Permission Denied id fred uid=500(fred) gid=502(sharedgroup) groups=502(sharedgroup),500(fred) context=user_u:system_r:unconfined_t Any idea what I'm doing wrong??

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• Learning Linux screencasts

  - by Dmitriy Nagirnyak

  Hi, I am trying to get started with Linux. There are number of books (many of which are just man pages), some of them provide good overview so I can dig deeper online then. What I would like is to find number of screencasts that would cover basics of Linux commands, server administration, commonly performed tasks etc (no GUI, only terminal). I want to watch the screencasts to "get it quicker" and then use a book or online resources to "dig it deeper". Any recommendations? Thanks, Dmitriy.

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• JQuery validate: How to add a rule for regular expression validation?

  - by PeterTheNiceGuy

  I am new to JQuery and am using the JQuery validation plugin. Great stuff! I want to migrate my existing ASP.NET solution to use JQuery instead of the ASP.NET validators. I am missing a replacement for the regular expression validator. I want to be able to do something like this: $("Textbox").rules("add", { regularExpression: "^[a-zA-Z'.\s]{1,40}$" }) Could anyone give me a hint how to add a custom rule to achieve this?

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• WPF Style - value based on another control's property

  - by David Ward

  Is it possible to set the BorderBrush property in a style, to the value of the BorderBrush property of an instance of another control? Something like: <Style x:Key="{x:Type Controls:TimePicker}" TargetType="Controls:TimePicker"> <Setter Property="BorderBrush" Value="[ElementName=txtText Property=BorderBrush]"/> </Style> The reason for this is that I'm using Infragistics controls that have a "Theme" that can be changed and I want my custom control to change border style at the same time.

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• Crontab script on Mac OS X Lion does not work anymore

  - by Nopster

  I have a problem with cron tasks. Previously this script worked fine on Mac OS X 10.6 server, but when I initialize it on Lion (client), this script stopped working. Basically, this .bat file calls a jar file (that invokes a loop of mysqldump commands) to backup several databases on several servers, and runs perfectly if launched by the shell. cd /Users/nameoftheuser/Desktop/backupper /usr/bin/java -cp .:Backupper.jar:lib/mail.jar backupper.Main "/Users/nameoftheuser/Desktop/backupper/listasiti.txt" "/Users/nameofthe/Desktop/backupper/config.properties But if the cron launches the same .bat file, the generated database backups are 0 bytes. The cron entry is: 0 0 sh /Users/path/to/file.bat I believe that the problem is that cron doesn't run as root. Or what else?

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• Fogbugz Duplicate Cases

  - by LeeHull

  I am using FogBugz free hosting to manage my project bugs, I also have several customers I create custom software for, been using FogBugz to keep everything organized. Question I have is, there are times where they send me an email with a bug, so I report it in my system and they create it as well, instead of having 2 cases of same bug, would like to merge or link them together, rather not just delete the duplicate. Is there a way to link them together, maybe like a cross reference or even merge them together?

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• Fixing Windows 7 hibernation

  - by 80skeys

  I've been mucking around with the partitions on my laptop (I'm an experienced Linux/grub guy) and have somehow ended up affecting the ability of Windows 7 to go into hibernate mode. All other functionality seems to be okay. But when I press Hibernate, it behaves as if it starts to (screen goes dark, a little disk activity) but never powers off and if I move the mouse the login screen instantly comes up. I don't know if Window uses a separate partition for hibernation? There is a 200MB partition on the drive - I seem to recall it was related to diagnostics or some other Windows- boot menu stuff. In any case, wondering if there's some commands I can run to restore the ability to hibernate and also which partitions need to be marked "active" and if there's anything I need to do to the MBR of the hard drive or the MBR of the Windows partition? As I said, Windows boots fine as long as it is designated the Active partition. I just need to fix Hibernation.

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• NTP configuration in NEXUS Switch

  - by Pandi Durai

  i'm planning to change the NTP peer to 172.29.100.44,but i'm unable to delete the existing and add new peer NTP peer IP in Nexus switch,Please suggest me in removing the existing configuration. i have use the below commands to remove the peer,But still its not getting deleated from running configuration.Even if i add new peer,its not getting reflecting in running configuration. no ntp peer 172.29.100.10 use-vrf management. ntp peer 172.29.100.44 use-vrf management Existing configuration: ntp distribute. ntp peer 172.29.100.10 use-vrf management. ntp source-interface mgmt0. ntp commit. My another nexus is working fine with the below Configuration: ntp peer 172.29.100.10 use-vrf management. ntp peer 172.29.100.44 use-vrf management. ntp source-interface mgmt0.

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• Alt, Meta and other modifier keys

  - by KAction

  I want to get more combos in Emacs, so I tried to bind Alt, Super, Hyper via modmap to keys. I failed at it. So I tried to use xdotool. I started emacs -Q for clean experiment. Pressed C-hC-c and executed in other terminal: xdotool key --window 119537875 "meta+x" xdotool key --window 119537875 "alt+x" Both commands resulted in M-x runs the command execute-extended-command. So, Emacs do not differ between Alt and Meta. How can I fix it?

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• Spring MVC return ajax response using Jackson

  - by anshumn

  I have a scenario where I am filling a dropdown box in JSP through AJAX response from the server. In the controller, I am retuning a Collection of Product objects and have annotated the return type with @ResponseBody. Controller - @RequestMapping(value="/getServicesForMarket", method = RequestMethod.GET) public @ResponseBody Collection<Product> getServices(@RequestParam(value="marketId", required=true) int marketId) { Collection<Product> products = marketService.getProducts(marketId); return products; } And Product is @Entity @Table(name = "PRODUCT") public class Product implements Serializable { private static final long serialVersionUID = 1L; private int id; private Market market; private Service service; private int price; @Id @GeneratedValue(strategy = GenerationType.AUTO) public int getId() { return id; } public void setId(int id) { this.id = id; } @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name = "MARKET_ID") public Market getMarket() { return market; } public void setMarket(Market market) { this.market = market; } @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name = "SERVICE_ID") public Service getService() { return service; } public void setService(Service service) { this.service = service; } @Column(name = "PRICE") public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } } Service is @Entity @Table(name="SERVICE") public class Service implements Serializable { /** * */ private static final long serialVersionUID = 1L; private int id; private String name; private String description; @Id @GeneratedValue @Column(name="ID") public int getId() { return id; } public void setId(int id) { this.id = id; } @Column(name="NAME") public String getName() { return name; } public void setName(String name) { this.name = name; } @Column(name="DESCRIPTION") public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } } In the JSP, I need to get the data from the service field of Product also. So I in my JQuery callback function, I have written like product.service.description to get the data. It seems that by default Jackson is not mapping the associated service object (or any other custom object). Also I am not getting any exception. In the JSP, I do not get the data. It is working fine when I return Collection of some object which does not contain any other custom objects as its fields. Am I missing any settings for this to work? Thanks!

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• Adding AllowPartiallyTrustedCallers with MSBuild

  - by Ben Rice

  I am using CC.Net with MSBuild tasks to build an application that is composed of a number of solutions and projects. We are using the AssemblyInfo MSBuild Community task to update version info in AssemblyInfo.cs. Unfortunately the AllowPartiallyTrustedCallers attribute doesn't get in and the AssemblyInfo task tells me that the AllowPartiallyTrustedCallers attribute is not supported by the task. Is there any way to add that attribute through MSBuild without having to resort to a custom task that just tacks the line at the end of the file after-the-fact?

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• Dynamic Data: how to filter dropdown for foreign key on edit page

  - by Leonv

  I have Organisation with a foreign key to a Manager. Managers can be active, or inactive. On the Dynamic Data edit page for Organisation, I need to filter the dropdown for Manager to only show active records. I started out by making a custom version of DynamicData\FieldTemplates\ForeignKey_Edit.ascx and setting a UIHint to the new field template on Organisation.Manager. But, how to customize the linq or sql query that runs to load the Managers? Using Linq-to-SQL and DynamicDataFutures

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• Remove CGI from IIS7

  - by jekcom

  I ran some security scan and the scan said that all kind of CGI stuff are potential thread. This is part of the result : (ash) is present in the cgi-bin directory (bash) is present in the cgi-bin directory By exploiting this vulnerability, a malicious user may be able to execute arbitrary commands on a remote system. In some cases, the hacker may be able to gain root level access to the system, in which case the hacker might be able to cause copious damage to the system, or use the system as a jumping off point to target other systems on the network for intrusion and/or denial of service attacks. and many more related to cgi-bin directory. First I searched all the server for cgi-bin folder and it did not find any. Second I'm running my website on pure .NET and I don't use any scripts like php. Question is how can I remove this CGI thing from the IIS?

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• Create Dialog with user Input

  - by cmptrer

  Is it possible to create an AlertDialog, or custom Dialog wit an EditText box? If not, how do I make an activity window floatable. What I want to do is show a screen with some text, a small box for the user to enter a couple digits, and then a submit and cancel button, and am trying to find out the best way to do this.

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• ASP.NET Routing - load routes from database?

  - by ropstah

  Is it possible to load routes from the database with ASP.NET ? For each r as SomeRouteObject in RouteDataTable routes.MapRoute( _ r.Name, _ r.RouteUri, _ r.RouteValues, _ //?? r.Constraints _ //?? ) Next How should I store the routevalues / constraints? I understand that there are several 'default' routevalues like .Controller and .Action, however I also need entirely custom ones like .Id or .Page...

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• configuration transfer over scp on commit not working on Juniper EX-2200 switch

  - by liv2hak

  I am making a series of configuration changes on Junos EX- 2200 switch.I have this router connected to another PC via an ethernet cable.The IP address of the switch is 192.168.1.1.I am able to ping from 192.168.1.1 to 192.168.1.0 and vice-versa. After the changes I make I do the following commands set system archival configuration transfer-on-commit set system archival configuration archive-sites "scp://[email protected]:/home/karthik/ws_karthik/sw1_config_1.txt" password godfather commit Where there is a user with user-name "karthik " and password "godfather".The path shown above also exists in the system How ever I don't see the configuration file sw1_config_1.txt created at the path specified. Also I have verified that sshd is running on the PC (192.168.1.10) Am I doing something wrong here? It would be great if anyone could help me out.

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• Error 0x8007007e When trying to mount WinPE 5 wim in Windows 7 using Powershell

  - by BigHomie

  Using ADK for Windows 8.1, and the DISM cmdlets that come with them. I have WMF 4.0 installed. My machine is Windows 7 x64 SP1, and I'm trying to mount the wim using PS C:\Users\BigHomie> Mount-WindowsImage -ImagePath 'C:\Program Files (x86)\Windows Kits\8.1\Assessment and Deployment Kit\Windows Preinstallation Environment\x86\ en-us\winpe.wim' -Path C:\WinPE_x86 -index 1 And receive the following error: Mount-WindowsImage : DismInitialize failed. Error code = 0x8007007e At line:1 char:1 + Mount-WindowsImage -ImagePath 'C:\Program Files (x86)\Windows Kits\8.1\Assessmen ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~ + CategoryInfo : NotSpecified: (:) [Mount-WindowsImage], COMExcep tion + FullyQualifiedErrorId : Microsoft.Dism.Commands.MountWindowsImageCommand Using dism.exe works fine. Update Forgetting I had this problem, I went to mount a wim using the Powershell ISE and actuallygot a visual error message about "C:\Program Files (x86)\Windows Kits\8.1\Assessment and Deployment Kit\Deployment Tools\x86\DISM\api-ms-win-downlevel-advapi32-l4-1-0.dll" not being installed. After checking that the dll did in fact exist in the folder I called regsvr32 and received another error message Will try reinstalling as recommended.

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• Show alert message box from the Global.asax (on Application_Error event)

  - by Albert

  Normally I just redirect to a custom error page in on the Application_Error event, but I have a specific error for which I'd like to display an alert message while the user is still on the page which triggers the error. How can I make this happen? I'm open to a modalpopup or any other type of error message, I just want to ensure the user stays on the page where they encounter the error. Thank for any ideas.

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