Category Archives: Servers

Windows : How to retrieve Fiber Channel interface WWNs

Here is a simple PowerShell command that will output the FC host adapter interface WWNs.

If your interface have two ports, both will be output in order. This command have been successfully tested with QLogic adapters on Windows 2012 and 2016.

Linux : How to show domain TTL with DIG

Here is some useful commands to display a domain Time To Live (TTL) using the DIG command (which is usually included within “bind-utils” package). To display the full information :

To display the short, default answer :

NOTE : Replace “domain.tld” by the domain you want to query.

Windows : Change DNS update frequency in Active Directory

If you are not satisfied with the refresh rate of DNS within your active directory environment, there is a way of forcing it by increasing or decreasing the default setting in the registry. First of all, there is a command to find out your curent settings :

It should output something similar to :… Read More »

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 »

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 »