Category Archives: Operating Systems

Windows : How To get the members of a group in Active Directory using PowerShell

Here is some useful commands to list the members of a group in Active Directory using PowerShell. Get members of a group :

Get members of a group, recursively (to list all members of sub-groups members of that group) :

NOTE : Replace “Group Name” (keeping the double quotes) with the desired Group… Read More »

Linux : R1Soft The following signatures couldn’t be verified because the public key is not available

Getting this error from the R1Soft repo lately trying to run a “apt-get update” on Debian Linux? Ign http://repo.r1soft.com stable Release W: GPG error: http://repo.r1soft.com stable Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 39A4965166BD1D82 Simply do the following to import the new key and get rid of… Read More »

Windows : File Explorer don’t refresh

I had this strange issue on Windows 8/10 where changes such as file/folder renaming or deletion not appearing after a modification. A manual “Refresh” from the contextual menu (right click + Refresh) was required to show the last modification. It seem that some Windows core components were corrupted and needed to be repaired/restored. First of… Read More »

Linux : Package package-name.rpm is not signed

Having the following error trying to install a unsigned package from Yum repository on CentOS/RHEL? Unless you get an officially signed package(s), you will need to override/accept the installation of unsigned package (if you trust the source/issuer, of course). If installing a locally located rpm file(s), you may use the command “rpm -ivh package-name.rpm“. If… Read More »

Windows : RDP An authentication error has occurred. The function requested is not supported

Since the latest Windows Updates, you might be encountering the following error when you RDP to another computer or server : An authentication error has occurred. The function requested is not supported Remote computer: This could be due to CredSSP encryption oracle remediation. For more information, see https://goomicrosoft.com/fwlink/?linkid=866660 This is basically due to the fact… Read More »

Windows : Recover lost session profile

Have you lost your session profile since the last time you logged in on your Windows PC (meaning login with your user account and your settings and/or files vanished)? There might be multiple causes for that, such as you logged into a temporary profile or you joined the PC to a domain. (If this happened… Read More »

MacOS : Unable to negotiate with 0.0.0.0 port 22: no matching cipher found

Having the following issue connecting to a device using SSH after upgrading to macOS High Sierra 10.13.2? Unable to negotiate with 0.0.0.0 port 22: no matching cipher found. Their offer: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se This is an expected behavior if you attempt to connect to a legacy system or network device running older version of SSH. To workaround… Read More »

Windows : How to pause Windows 10 updates download

Since Windows 10, Microsoft made it harder for users to disable automatic updates and downloads. When triggered automatically, there is no function on the user interface to stop them, unfortunately. If you are running with the default settings, you might at some point end up working on your computer and noticed that your bandwidth was… Read More »