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VMware : Call “HostFirewallSystem.UpdateRuleset” for object “firewallSystem” on ESXi failed

Having the following error trying to apply IP restriction in the ESXi firewall using the vSphere client? Call “HostFirewallSystem.UpdateRuleset” for object “firewallSystem” on ESXi “0.0.0.0” failed. Operation failed, diagnostics report: Sysinfo error on operation returned status : Already exists. Please see the VMkernel log for detailed error information This behaviour can happen under the following… Read More »

ScreenOS : Failed to upgrade via WebUI and bogus image not authenticated on console

If you tried to upgrade your Juniper SSG ScreenOS version lately using the WebUI and got the message “Failed to upgrade” and the console output showed : ********Invalid image!!! ********Bogus image – not authenticated!!! Fips check failed (This would output the same if you tried to manually upgrade from the console). This could indicate two… Read More »

Windows : How to list all users within an Active Directory Organisational Unit (OU) with PowerShell

It is fine to list users manually when you have a few, but can be just unthinkable when you have a thousand! Fortunately, PowerShell can make it easy for you. The following command will list all the users (even those who are disabled) with a lot of useful information. The command to use is :… Read More »

VMware : A general system error occured: Input/output error while deleting a large VM

The following error may occur if you have requested a VM to be deleted from disk : A general system error occured: Input/output error In my particular case, the VM was up to 12 Tb and after a little while the operation was running, the error message above showed up in vCenter. The virtual machine… Read More »

Linux : vsFTPd 550 Permission denied error

Have you encountered the following error while doing upload or delete operation with vsFTPd server? 550 Permission denied error Open your vsFTPd configuration file : /etc/vsftpd/vsftpd.conf Or : /etc/vsftpd.conf 1. Locate the following parameter : write_enable=YES Set to YES or make sure it is not commented # (remove comment and reload the daemon). 2. If… Read More »

VMware : Unable to connect to the MKS: Login (username / password) incorrect

Having the following error while trying to open the console of your guest VMs? Unable to connect to the MKS: Login (username / password) incorrect This is happening because the communication between your client computer and your vSphere host isn’t working properly. The main cause for this would be that the ports required for the… Read More »

Linux : Shutdown MySQL with MySQLadmin

When using the usual service shutdown is not enough (MySQL is still active, even though you have issued “service mysqld stop” or “/etc/init.d/mysql stop”), you can use this alternate method for a graceful shutdown : mysqladmin -uroot -p -h127.0.0.1 –protocol=tcp shutdown Or : mysqladmin -uroot -p -h127.0.0.1 shutdown

Web : Firefox error ssl_error_weak_server_ephemeral_dh_key

Did you had the following error lately trying to open a SSL Web site with Firefox? Error ssl_error_weak_server_ephemeral_dh_key This is because the remote Web server is using the weak SSLv3 protocol. The only way to get to the site would be disabling this SSLv3 check in Firefox. However do only if you know what you… Read More »

Linux : Binary location for [/usr/bin/host] in csf.conf is either incorrect, is not installed or is not executable

The following error may occur while reloading CSF (csf -r) : *WARNING* Binary location for [HOST] [/usr/bin/host] in /etc/csf/csf.conf is either incorrect, is not installed or is not executable *WARNING* Missing or incorrect binary locations will break csf and lfd functionality In this particular case, CSF was installed on a CentOS 7 server and there… Read More »

VMware : PCPU 3 locked up. Failed to ack TLB invalidate.

The following error is usually represented by a “pink screen of death” with the following output : PCPU 0 locked up. Failed to ack TLB invalidate. @BlueScreen: PCPU 0 locked up. Failed to ack TLB invalidate. NMI IPI received. Was eip(base):ebp:cs [0x76a42(0x41802f800000):0x412520x4010](Src 0x1, CPU2 The cause is that when interrupt occur, a context switch must… Read More »