Windows

Remove GPO installed software from machine

Posted on by Andy

Here a simple step to remove GPO instaled software from your machine and make it reapply the GPO:

  • Remove software from Control Panel -> Software
  • Find and the clear the software UID from
    HKLM\Software\Microsoft\Windows\Current Version\Group Policy\AppMgmt
  • OR delete HKLM\Software\Microsoft\Windows\Current Version\Group Policy completely
  • open terminal/cmd as administrator and execute
    gpupdate /force
  • and last, reboot the desktop

After a reboot the GPO should have been (re)applied and the software been installed.

Activate Windows Server in Powershell/Command

Posted on by Andy

First check editions which can be upgraded to from evaluation:

# Dism /Online /Get-TargetEditions

Then launch the activation process with:

# Dism /online /Set-Edition:ServerStandard /AcceptEula /ProductKey:12345-67890-12345-67890-12345

Please remember to replace “Set-Edition” and “Productkey” values with your desired ones.

FreeBSD network tuning for KVM

Posted on by Andy 
ifconfig_vtnet0="inet xxx.xxx.xxx.xxx netmask xxx.xxx.xxx.xxx -rxcsum -txcsum -rxcsum6 -txcsum6 -lro -tso"

The above line is taken from /etc/rc.conf. “vtnet0” is the interface description for a virtIO device, on Hyper-V it is named “hn0”.

-rxcsum-/txcsum: disable Rx/Tx Checksum Offloading
-lro: disable TCP Large Receive Offloading
-tso: disable TCP Segmentation Offloading

The parameters above disable hardware offloading to the network card, this may increase CPU usage but some cards are simply not powerful enough to handle high traffic and some hypervisors are not 100% compatible with these settings.