Remko Weijnen's Blog (Remko's Blog)

About Virtualization, VDI, SBC, Application Compatibility and anything else I feel like

Archive for the ‘Uncategorized’ Category

Announcement: Dear Visitor

If this is your first visit, take your time and look around. Here are some things you might be looking for:

Do you like my work? Did my work help you?

  • Leave a comment and tell me how it was usefull to you.
  • If you want you can make a donation with the Paypal Donate Button in the right Sidebar.

Thank you!

  • Comments Off on Announcement: Dear Visitor
  • Filed under: Uncategorized
  • imageI recently (well today really) started playing with the Citrix Linux VDA. I took Ubuntu to test because I happen to like Ubuntu.

    I didn’t get it to work correctly right away though and during troubleshooting I wanted to know where the VDA is storing it’s settings.

    I found the following file /etc/xdl/ctx-vda.confwith the following contents:

    (more…)

    On forbes.com, Cookies and Ads

    Even though I try not to visit the forbes.com site anymore due to their heavy usages of ads, anti adblocker and overwhelming number of cookies they’re trying to push, sometimes however I accidentally follow a tweet that leads to forbes.com and just notice it to late.

    Besides wasting your bandwidth, mobile data and especially time there have been a few occasions were the forbes.com page was actually serving malware from their adfeeds.

    It annoys me bigtime so let’s “fix” this:

    First thing that happens upon visiting the forbes site is that you get a blurred background with a random ad or quote of the day and you need to press Continue to article:

    image

    If you open the Developer console in Chrome (Application tab) you can see that Forbes uses a cookie that expires in 24 hours. This cookie make sure that you don’t see the “welcome” ad for 24 hours:

    (more…)

    Convert Executable to PowerShell

    Recently I stumbled upon an executable that appeared to be a PowerShell script converted into an executable.

    I was curious to the actual script so I decided to have a look and see how I could convert the executable back into PowerShell.

    Having seen similar techniques to turn vb scripts and java jar’s into executables I first looked if this particular executable was simply carrying the payload in the resource section.

    I opened the executable with Resource Hacker and saw 2 resources (note that I am using a simple HelloWorld executable here in the screenshots). The first resource, named 1, is clearly a Unicode string with the title:

    Resource Hacker Screenshot showing the resources

    Resource Hacker – HelloWorld.exe

     

    (more…)

    Google Earth fix for XenApp, RDSH & Horizon

    Google Earth LogoBoth Google Earth and Google Earth Enterprise do not work correctly for multiple users on shared Hosted Shared Desktops (I still prefer to call it Server Based Computing but that’s likely because I’m an oldtimer).

    Problem summary
    So let’s look at the actual issue: the first user on a server is able to launch Google Earth but for any subsequent users on the same server Google Earth fails silently.

    Problem details
    Google Earth uses various synchronization objects such as Events and Mutexes but registers those in the \Global namespace instead of the \Local namespace.

     

    (more…)

    Citrix NetScaler LogoRecently I switched over my blog from a hoster to a self hosted VM. In my setup I am using Citrix NetScaler as a reverse proxy.

    Simular to when you’re using a 3rd party reverse proxy such as CloudFlare you will see the IP address from the reverse proxy instead of the actual Client IP Address on your webserver.

    This means that your logging will all show the same, internal, IP address and that IP Based Access Rules will not work.

    Fortunately this is easy to solve by having NetScaler add the Client IP Address in the headers and rewriting the address on your webserver.

    (more…)

    Blog improvements

    When I started this blog in 2007 (wow that’s almost 10 years ago) I went for a cheap web hoster with a reasonable performance to host it.

    In the beginning performance was acceptable but over the years it has degraded and of course user experience standards have changed.

    I decided it was time to do something about it so I’ve moved the blog from a shared platform to my own server.

    This server is running on optimized flash storage  where most writes are DeDuplicated and never actually hits the flash disks:

    image

    (more…)

    Twitter Analytics and AdBlock Plus

    Twitter has opened access to Analytics for all users. However when you use an Ad Blocker, like Adblock Plus, you’ll get the following error:

    A problem occurred while loading the page. To use this site, you need to disable AdBlock or any other ads-blocking extension you are using, or customize it to show ads on this site

    For Adblock Plus you can fix this by adding a filter: go to Filter Preferences and on the "Custom filters" tab add a new filter within a filter group (or create a filter group for this rule).

    Use this as a filter rule:

    @@||ads.twitter.com/stylesheets/ads-allow.css

    SNAGHTMLea2974c

    And don’t forget to Enable the rule!

    EDIT: Twitter user @Ertraeglichkeit mentioned a different method:

    (more…)

    System Center Operations Manager LogoIn a SCOM Management Pack Custom Properties can be used for Alert Description and Notification as described in this blog by Kevin Holman.

    In my case I wanted to add the Display Name and the Performance Counter Value in a Performance Threshold Monitor. In XML it would look this this:

    But how to add these parameters when using the System Center 2012 Visual Studio Authoring Extensions?

    (more…)

    Sophos UTM IconI am currently implementing Sophos UTM and I quite like this solution. It is free up for home usage and can easily be installed on a hypervisor.

    I wanted to scan encrypted traffic (ssl) as well so I activated the "Decrypt and scan" option:

    image

    When testing this on one of my iPad’s I noticed that the App Store didn’t work properly anymore.

    When I tried to update applications I got the following error: "Cannot connect to iTunes Store". Additionally when I searched for Apps the search would return no results.

    (more…)

    Donate


    Blogroll


    Categories


    Archives