Outgoing e-mail failing with the following error on your cPanel mail server? 503 Valid RCPT command must precede DATA This can be caused by various factors, such as permission issues, out of space or inode limit reached. To investigate this issue, a good start would be having a look at the logs to find out… Read More »
Heading toward OpenNMS and Grafana for your monitoring and visualization needs? Way to go! (or Oh Yeah! like Duffman would say). First of all, I suppose since you’ve end up reading that post, that you have a successful installation of OpenNMS, Grafana and OpenNMS Help plugin. Adding a data source in Grafana in your OpenNMS… Read More »
If you have an Intel card and the necessary “Advanced Network Services (ANS)”, that is bundled with the Intel driver, you have the capability to manage VLans for your network interface with PowerShell. 1. Use the “ipconfig” command to find out the name of your adapter. Example : PS C:\WINDOWS\system32> ipconfig Windows IP Configuration Ethernet… Read More »
Experiencing the following behavior with RHEL/CentOS 7.2 and NFS? NFS folder mount hang and the following output can be observed in logs and dmesg : NFS: state manager: lease expired failed on NFSv4 server 0.0.0.0 with error 10082 NFS: nfs4_discover_server_trunking unhandled error -512. Exiting with error EIO nfsd: last server has exited, flushing export cache… Read More »
In some rare occasion, you may end up with an orphaned VM in your vCenter inventory where no “remove” option is available from the option menu. Beside doing the removal using the CLI, there is still a way that worked most of the time for me. 1. Browse to “VMs and Templates inventory” inside the… Read More »
If you are running both cPanel and have your own R1Soft server, there is a nice integration in cPanel that allow users to restore files, database or their whole account from this external backup source/destination. There are several steps involved for this, such as : 1. Enable control panel restore on the R1Soft server ;… Read More »
It is possible with Config Security Firewall (CSF) to open an inbound port from a specific source IP address. This is defined outside of the global configuration (csf.conf), within a dedicated config file. 1. Open the following file with your favorite text editor : /etc/csf/csf.allow 2. Follow this syntax to open a specific port for… Read More »
Having the following error when trying to add a new hypervisor to an existing cluster in VMware vCenter? A general system error occurred: Time out waiting on vpxa to start This is most likely happening with the ESXi version is greater than the ones supported by your currently running vCenter. Have a look at the… Read More »
Under some rare circumstances, you may require to change the default route metric. The first way of doing should be through the “ifcfg-ethX” configuration file by adding the “METRIC=” statement. However it has been found to be inefficient for me and had to apply it using “ip route” as followed : ip route del default… Read More »
If your Windows 10 system suddenly stopped booting and show the following error message : VOLMGRX INTERNAL ERROR It most likely mean that your software RAID volume has failed. It may indicate a hardware underlying issue, such as a failed drive or the mirror just broke and is no longer in sync. To find out,… Read More »