Category Archives: Servers

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 »

Dell : How to install a custom issued SSL certificate on iDRAC

If you already have a certificate generated by a certificate authority (or maybe a wildcard certificate), you can use the following procedure to configure it on your iDRAC, so you can get rid of the browser security warning. We will use the iDRAC “racadm” command line utility (if you do not have it already, you… 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 »

Linux : How to show connected client of NFS export on the server?

Here is how to quickly show the connected clients to a NFS server. It might be useful to know before rebooting the server! On the server, execute the following command (replace <> with the NFS server IP address) :

Example :

You should see a similar output : tcp 0 0 192.168.45.32:2049 192.168.45.52:840… Read More »