For the most part, PoE (Power over Ethernet) works perfectly with LLDP (Link Layer Discovery Protocol). I recently ran into a bizarre issue with a UniFi AP and an HPE Aruba switch where the AP would reboot under load. In this post, I will cover how I fixed it and everything I learned in this…
Cisco UCS can sometimes trigger a false positive alert of FFCH_ERROR_CARDS_ACCESS_ERROR on the FlexFlash controller, which typically has the fault ID of F1262. Depending on your setup, you should investigate the alarm appropriately. If, after your investigation, you determine that the fault is a false positive, the first step is to reset the FlexFlash controller.…
PowerShell is a wonderful tool built into Microsoft Windows. Both Windows and Windows Server come with PowerShell version 5.1 pre-installed. PowerShell version 5.1 was initially released in 2016. Since then, there have been many improvements to PowerShell. However, many of those improvements are only available in newer versions of PowerShell and aren’t always backported to…
An issue I’ve run into on Palo Alto Networks firewalls is that everything seems to work when importing a certificate (usually a PFX). Until you start using the certificate, then after a validation or a commit, there’s a warning that the certificate chain is not correctly formed. Warning: certificate chain not correctly formed in certificate…
Usually, when you want to control the Windows Update settings, you create a GPO to manage the settings or tweak some registry entries. Both methods alter the registry values in the registry key To reset any custom Windows Update settings, I nuke out that registry key or reverse the GPO or both, and restart the…
I recently encountered a strange issue with Omnissa Horizon (formerly VMware Horizon) that resulted in a black screen presenting to the VDI users when they logged in. When you search for this issue, you will find a lot of information about various solutions to the blank screen issue. However, none of them solved the problem…
The VMware vCenter root certificate is an essential part of vCenter. When you install vCenter, it also installs the VMCA (VMware Certificate Authority) in your vCenter. The VMCA is a barebones CA for vCenter that issues certificates to the various elements of vCenter as needed. You should install the VMCA root certificate on your system…
I recently discovered that I caused an unintended side effect on Windows 10 when deploying a default taskbar for all users. In my post Intune Deploy Default Taskbar I inadvertently introduced a bug to the Windows 10 Start Menu making it so users can’t customize anything. The bug is that users can pin programs to…
I needed to route an FQDN (Fully Qualified Domain Name) down an IPSEC VPN tunnel but couldn’t because it was an external address and the IP is dynamic so I wasn’t able to just make a static route to force it down the IPSEC VPN tunnel. To solve this I discovered something called policy based…
I recently ran into an issue where I had uninstalled Onyx on my switch and I was trying to reinstall it but couldn’t because I was getting an error. Below is an example of the error. partition exists – please uninstall firstEXT4-fs (sda3): couldn’t mount as ext3 due to feature incompatibilitiescp: write error: No space…
