vSphere (General)

How to fix Expired Password issues for vCenters & PSCs (Also for vCF environments)

How to fix Expired Password issues for vCenters & PSCs (Also for vCF environments)

So a frequently upcomming issue at customers, is the password expiration of the root password. This is set by default for 90 days, and after 90 days, well people figure out that they cannot login. ...
Password Expired for vCenters & PSCs (Solution also for vCF)

Password Expired for vCenters & PSCs (Solution also for vCF)

So a frequently upcomming issue at customers, is the password expiration of the root password. This is set by default for 90 days, and after 90 days, well people figure out that they cannot login. ...
Check if the Replication is working between PSCs

Check if the Replication is working between PSCs

For a customer I was replacing the SSO/STS certificates, after the change wanted to make sure if the PSCs were still replicating the information between each other. To simply check this Type the ...
Check & Renew the expiration of the Machine Certificate of the PSCs & vCenter (vCenter 6.5/6.7)

Check & Renew the expiration of the Machine Certificate of the PSCs & vCenter (vCenter 6.5/6.7)

Intro At a customer we got the notification in the vCenter that the certificate was almost expiring. This was about the SSO/STS certificate. Later we found out that also the machine certificates ...
Renewing the default STS (SSO) Certificate of vCenter/PSC in a vCF Environment

Renewing the default STS (SSO) Certificate of vCenter/PSC in a vCF Environment

At a customer we got the notification in the vCenter that the certificate was almost expiring. However, the vCenter with version 6.7 was part of a vCF Deployment. Almost all the certificates are ...
Warning: SSL Certificate almost Expired

Warning: SSL Certificate almost Expired

SSL Certificate almost Expired At a customer we got the notification in the vCenter that the certificate was almost expiring. When I checked the HTML client, I couldn’t find the SSL ...
Error when trying to access VMware PSC with WinSCP (6.7)

Error when trying to access VMware PSC with WinSCP (6.7)

For a customer, I needed to upload a script towards the PSC, and my favourite tool for that is WinSCP. However, when trying to access, I got the following Error. The reason for this is that the ...
Deployment of a OVF / OVA is stuck with Validating…

Deployment of a OVF / OVA is stuck with Validating…

Issue At one customer I was deploying vRNI. For some reason, every time when I selected the ova file that I downloaded from VMware, it stayed stuck in the “Validating” screen. This could take a long ...
Troubleshooting: Cannot Add host “Authenticity of the host’s SSL certificate is not verified”.

Troubleshooting: Cannot Add host “Authenticity of the host’s SSL certificate is not verified”.

Intro One of my customers wanted to change the hostname of the ESXi host. In this case, the ESXi hostname stayed the same, but it needed to become part of  a subdomain. Changing an ESXi hostname ...
VUM Error: Host cannot download files from VMware vSphere Update Manager patch store

VUM Error: Host cannot download files from VMware vSphere Update Manager patch store

Setup: vCSA 6.5 with embedded VUM Intro: At one of my customers, I had a weird problem that one of the hosts couldn’t updated through VUM. Time to investigate. Error: “Host cannot ...
How to Rollback an ESXi host after an update

How to Rollback an ESXi host after an update

Upgrading and updating your ESXi hosts is necessary. Updates contain bug fixes, security updates, new features or improvements, and drivers. With VUM this can be quite easy. However, sometimes you ...
vCenter doesn’t start up – Failed to start File System Check on /dev/dis..

vCenter doesn’t start up – Failed to start File System Check on /dev/dis..

A customer of mine had some problems with a vCenter (vCSA 6.5) that didn’t want to boot up anymore. First thing I checked was if I could log in on the vCenter Appliance Management Interface (VAMI). ...
vSphere Troubleshooting: Hosts Disconnects  “Agent unable to save configuration to disk: Error syncing firmware configuration: vim.fault.TooManyWrites”

vSphere Troubleshooting: Hosts Disconnects “Agent unable to save configuration to disk: Error syncing firmware configuration: vim.fault.TooManyWrites”

During a deployment of several ESXi hosts at a customer, I noticed that the new hosts were disconnecting every few minutes. When I checked the event error, it showed a lot of different errors and ...
Troubleshooting: vSphere Sessions are constantly logging off –  Connection Timeout

Troubleshooting: vSphere Sessions are constantly logging off – Connection Timeout

I recently had a problem that one of my vCenters (vCSA 6.5) was constantly logging off any kind of user after a few minutes. Which would end up with the following error output: “Your vsphere Client ...
vCSA6.5 Installation Stuck at 80% and some other fun errors during Deployment.

vCSA6.5 Installation Stuck at 80% and some other fun errors during Deployment.

if you came across this post then you’ll probably had the problem that the vCenter installation became stuck around the 80%, with the text “Installing RPM This may take several minutes”. ...
Hyper-V to VMware Conversion (V2V)

Hyper-V to VMware Conversion (V2V)

A while ago I started to make also some video’s to help people with certain problems. One of them was changing the language settings in Windows 10, but now I also made a V2V conversion ...
ESXi Install 5.x & 6.x

ESXi Install 5.x & 6.x

How to Install ESXi 5.x & 6.x The screenshots are of 5.1. but the setup is almost the same, if not the same to all versions up till 6.5. When you are installing an ESXi host, it is best to use ...