If you are running vSphere vCenter, you might have encountered the following error trying to modify virtual hardware (vDisk) on a VM directly from a host instead of doing it through vCenter : Access to resource settings on the host is restricted to the server which is managing it This behaviour is actually expected, some… Read More »
You may have encountered the following issue trying to run “fuser” command on CentOS/RHEL 7 : fuser: command not found Many system administrators turn to do minimalist installation with version 7, unfortunately this even cut some critical basic components such as “traceroute, ifconfig, fuser, etc.” which in my opinion should be a part of a… Read More »
You may encounter the following error message with Microsoft Outlook, while browsing your IMAP tree folders, sending a message or moving message across them : IMAP server wants to alert you to the following: fatal error: no such file or directory I have observed this behaviour with a mailbox and a Linux mail servers (Qmail,… Read More »
Having the following error trying to convert a live CentOS/RHEL Linux system with VMware Converter? FAILED: A general system error occurred: Network error. Host x.x.x.x key can’t be retrieved. (return code 2) In my case, this happened while converting a RHEL 5.11 server with VMware Converter 6.1.1. If you went through the following : – SSH… Read More »
Having the red alarm led on but nothing is wrong with your JunOS powered Juniper device? First, look out what alarm is triggered by issuing the following command : show chassis alarm If absolutely nothing is really wrong, you will see the following alarm : Alarm time Class Description 2016-01-20 07:11:59 UTC Major Management Ethernet… Read More »
Among all the new bells and whistles coming with the latest major release of RedHat Enterprise Linux platform, resolution bot both the installation process and system console have changed (higher resolution than before is default). Unfortunately, server system does not necessarily have the newest display device or iLO, iDRAC and virtual machine consoles are out… Read More »
Having the following output message while trying to create a VLan outside higher than 1000 on your Cisco device? SWITCH-601(config)#vlan 2991 SWITCH-601(config-vlan)#end % Failed to create VLANs 2991 Extended VLAN(s) not allowed in current VTP mode. %Failed to commit extended VLAN(s) changes. This mean that you are running VTP mode 1 or 2, which only support… Read More »
Need to forward a custom port to an existing port on your Linux box? Simply use the following command as root : iptables -t nat -I PREROUTING –src 0/0 –dst 0.0.0.0/0 -p tcp –dport <port-to-forward> -j REDIRECT –to-ports <destination-port> Example : Assuming you want to forward port 1025 to port 587 : iptables -t nat -I PREROUTING… Read More »
With the latest macOS Sierra 10.12 release, you might have observed issue connecting to servers or network devices running SSH. Please note that this article does not necessary apply or macOS, but any running OS with the latest OpenSSH v7. Because of the latest OpenSSH version, some older (legacy) encryption algorithm have been removed from… Read More »
By default, as you may already know, Microsoft had disabled by default the “Administrator” for our own good. There might be some cases where you need it enabled. Since it is hidden from the user friendly accounts manager in control panel and the “advanced” MMC under Administrative Tools / Computer Management isn’t available in Home… Read More »