All posts by Michael Albert

Apache, KnowHow

Apache: Alias directive for virtual directory returns HTTP Error 403

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Hi,

I have added a virtual directory to an apache web server and the virtual directory is located outside the document root. I configured the httpd.conf how it is decripted in the apache doc

When I access the virtual directory an error “Access forbidden! Error 403” occured. The config seems to ok:

Alias /virtualdirectory/ "D:/user/www/virtual/"
<Directory "D:/user/www/virtual/">
   Options Indexes FollowSymLinks MultiViews ExecCGI
   AllowOverride All
   Order allow,deny
   Allow from all
</Directory>

Solution:

The default apache configration is very restrictive. It do not allow to access directories without authentication. This is defined in the Directory section of httpd.conf:


<Directory>
   AllowOverride none
   Require all denied
</Directory>

Add a “require all granted” directive to your virtual directory section will grant the access.

Alias /virtualdirectory/ "D:/user/www/virtual/"
<Directory "D:/user/www/virtual/">
   Options Indexes FollowSymLinks MultiViews ExecCGI
   AllowOverride All
   Order allow,deny
   Allow from all
   Require all granted
</Directory>
Electronic, Links

Electronic: Link to MC34063A calculator

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Hello,

I found these useful link to dimension a MC34063A DC2DC converter circuit:

Michael

Windows knowhow

Windows 7 & Getting drivers for obsulete printers

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Hello,

yesterday a customer had the problem that he wants an old printer, a HP LaserJet 5M, to get running on 15 Windows 7 clients. Unfortunately Windows has no driver on board and the manufactorer didn’t provider anyone.

Solution:

For many old printers you can install a driver via Windows Update. Go to the Control Panel, Device & printers and add a new printer

WindowsUpdate
Add printer driver from Windows update, to get the whole drivers list from windows update may take some time.Time for a coffee.

Continue reading Windows 7 & Getting drivers for obsulete printers →

Windows knowhow

Windows: Changing the power plan or a single value in a sheme

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This posts descripes how to change the power plan in Windows or a single option in a sheme from the Windows command line.

First of all start a cmd command shell  with administrator rights.

To get a list of all available shemes run


c:\> powercfg /L


Existing Power Schemes (* Active)
-----------------------------------
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e  (Balanced) *
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c  (High performance)
Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a  (Power saver)

The most options to powercfg at the command line must be specified with the GUID. To set the “High performance” plan active determine the sheme  GUID and execute

c:\> powercfg /S 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c

Query again und you see the other plan is active

c:\> powercfg /L
Existing Power Schemes (* Active)
-----------------------------------
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e  (Balanced)
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c  (High performance) *
Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a  (Power saver)

Let us supose we only want to modify a single option or value. For example, disable the “Allow hybrid sleep” value in sheme “Power Saver” and with AC power active. Then, you first have to query all of the content of a sheme, because we need the GUID as parameter for powercfg. The output is a long list of options, I redirect them in  a temporary file, because in the file it is easier to search for the necessary GUIDs.
Continue reading Windows: Changing the power plan or a single value in a sheme →

Virtualisation

Creating a virtual floppy disk image for Windows XP installation on VMware

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For VMware Workstation or ESX Server and other virtualisation Software it is sometimes necassary to have a virtual floppy disk file.

For example if you want to install Windows XP in a VMware virtual environment and you want to use a SCSI Disk at the virtual LSI Controller.  Windows XP hasn’t any driver for this controller and therefore no harddisk ist found and the installation aborts. Solution is, creating a virtual floppy file, copy the driver to this and attach the file as virtual floppy to the virtual machine.

Note: In the vSphere GUIs you can only enlarge SCSI Disks online. For IDE Disks you have to do this at the ESXi host command line which is described here.

Best system for do this is linux, here for example debian. There are all tools which are needed, except two are missing, installed by default .  Check if the dostools and unzip are not installed or get them via

apt-get install dosfstools unzip

Creating a empty floppy image with an 1,44MB FAT 12 filesystem is very easy. Name the  file as you want. For VMware vSphere the extension .flp should be the better choice. Create the floppy by using the following command

mkfs.msdos -C /tmp/floppy.img 1440 -F 12

Floppy is now ready to take some files .
Continue reading Creating a virtual floppy disk image for Windows XP installation on VMware →