IPv4 Network Subnet Prefixes, Masks, Usable Hosts
The following table shows the IPv4 network subnet prefixes, subnet masks, and the number of usable hosts. Prefix size Network mask Available subnets Usable hosts per subnet Total usable hosts /24 255.255.255.0 1 254 254 /25 255.255.255.128 2 126 252 /26…
HP iLO is not responding
When during boot of an HP ProLiant server you see the “iLO2 not responding. System health monitoring has been disabled.” error message you need to restart the HP Integrated Lights-Out (iLO) component in the server. iLo is a small, always on…
There is already an open DataReader associated with this Command which must be closed first
When your MVC 5 web application page tries to read the database using the Entity Framework in a loop you may get the following error message: InnerException: System.InvalidOperationException HResult=-2146233079 Message=There is already an open DataReader…
How to increase the security in a NetApp system
Use putty to connect to the IP address of the NetApp management port Log in with the Login and Password Start the System Console at the SP …> prompt type system console To change the root and naroot passwords type passwd for the Login: question…
Head tracking with a web camera and FaceTrackNoIR
FaceTrackNoIR is a free open source head tracking device to detect the movement of your head in simulation games. In a web browser go to http://facetracknoir.sourceforge.net/information_links/download.htm Download the full installer Run the…
Windows web service authentication in IIS Express
When you develop a SOAP web service in Visual Studio 2013 the IDE uses IIS Express for testing. To set up Windows authentication in IIS Express follow the steps below: Create a Local Security Group on your computer Right click Computer and select Manage…
How to sign in to your Windows 8 PC without an email address
When you set up Windows 8 the Sign in to your PC page asks you for your email address. It is you computer you should be able to use it without telling Microsoft your email address and other personal information. To use you computer without giving away…
How to remove Windows 8 and install Windows 7 on a Toshiba Satellite p50-A series laptop
If you want to remove the preinstalled Windows 8 from a new Toshiba Satellite P50-AST3GX2 laptop you need a Windows 7 DVD. You can buy the Windows 7 DVD at Amazon. The first step is to turn off UEFI in the BIOS and enable the legacy boot. This will…
How to completely shut down a Windows 8 computer
As I found out the hard way when you select “Shut down” on the Power icon in the lower right corner of the Windows 8 screen the computer does not really shut down, it only goes to hibernation mode. This cheat is the trick behind the…
How to remove Windows 8 and install Windows 7 on a Dell inspiron 7000 series laptop
If you want to remove the preinstalled Windows 8 from a new Dell inspiron 7000 series (7537) laptop you need an external USB DVD drive and a Windows 7 DVD. You can buy the LG external USB DVD drive for $40 at Best Buy, and the Windows 7 at Amazon. The…