A customer of mine asked for help to analyse a weird OAuth error. They are using a Microsoft Dynamics 365 Outlook plugin, which came up with an error:

"Can't connect to Exchange"

In addition to this, they also faced an issueaccessing shared calendars of Exchange Online mailboxes.

Clearly an OAuth error. So we ran the Hybrid Connection Wizard again, which finished without any errors. But the errors persisted. Next stop: OAuth configuration.

Six weeks ago, I passed the Microsoft AZ-103 exam and earned the Azure Administrator Associate. A last minute pass, because AZ-104 was already launched. But better late than never. I had to re-schedule the exam a couple of times because the test center was closed due to COVID19.

The Azure Administrator Associate is a Administrator-role certification and it is all about implementing, managing and monitoring the Azure identity, governance, storage, compute, and virtual network solutions.

You might got this news some days ago: Starting with September 1, 2020, browsers and devices from Apple, Google, and Mozilla will show errors for new TLS certificates that have a lifespan greater than 398 days. Due to this move from Apple, Google and Mozilla, you have to deal with the replacement of certificates much more often. And we all know: Replacing certificates can be a real PITA!

Replacing TLS certificates used for ADFS and Office 365 can be a challenging task, and this blog post will cover the neccessary steps.

I’ve got several mails and comments about this topic. It looks like that the latest ESXi 6.7 updates are causing some trouble on HPE ProLiant Gen10 servers.

I’ve blogged about recurring host hardware sensor state alarm messages some weeks ago. A customer noticed them after an update. Last week, I got the first comments under this blog post abot fan failure messages after applying the latest ESXi 6.7 updates. Then more and more customers asked me about this, because they got these messages too in their environment after applying the latest updates.

Microsoft Teams got a big push due to the current COVID19 crisis and many of my customers deployed it in the past weeks. At ML Network, we are using Microsoft Teams for more than a year, and we don’t want to miss it anymore.

We are running Exchange 2016 on-premises, currently CU16. We were missing the calendar tab in Teams since we started with Microsoft Teams. when you do some research about this issue, you will find many threads and blog posts, but these are the two key facts:

The task was simple: Change the alias and the primary SMTP address of a Microsoft Teams team. This can be done by changing the alias and the SMTP address of the underlaying Office 365 group. But how? All you need is a PowerShell connection to Exchange Online.

All you need is a PowerShell on your local computer and Office 365 credentials with the necessary privileges.

It was a bit quiet here in January caused by a new “private project” which has attracted some resources, and will pull more resources in the future.

But this will not stop me from documenting useful stuff. This one is nothing new, but commonly asked by some customers: How do I get my storage capacity back after deleting VMs?!

The outlined steps are all done using esxcli. You need to execute them on a single ESXi host, not on each host in the cluster.

This seems to be my last blog post for 2019 and it covers covers objective 2.4 (Build manageability requirements into a vSphere 6.x logical design) of the VCAP6.5-DCV Design exam. It is based on the VMware Certified Advanced Professional 6.5 in Data Center Virtualization Design (3V0-624) Exam Preparation Guide (last update August 2017).

The necessary skills and abilities are documented in the exam prep guide for the older VCAP6-DCV Design exam (3V0-622). I think they also apply to the current version of the exam:

This blog post covers objective 2.3 (Build availability requirements into a vSphere 6.x logical design) of the VCAP6.5-DCV Design exam. It is based on the VMware Certified Advanced Professional 6.5 in Data Center Virtualization Design (3V0-624) Exam Preparation Guide (last update August 2017).

The necessary skills and abilities are documented in the exam prep guide for the older VCAP6-DCV Design exam (3V0-622). I think they also apply to the current version of the exam:

Not every customer is running a full-blown vSphere Enterprise Plus licensing. To be honest, when I look at the number of sold licenses, most of my customers are running vSphere Essentials Plus. Not Essentials, nor Standard or Enterprise (Plus), but two or three hosts with Essentials Plus. And that’s perfectly fine!

Two or three hosts with 10 GbE and pretty often 12G SAS. Some of them with Fibre-Channel, nearly no one with iSCSI. My colleagues and I developed a pretty rock solid setup over the last years, which we sell like some kind of building block: HPE ProLiant, HPE MSA, Aruba Switches, vSphere Essentials Plus. A perfect setup for most of our customers, which run something between 10 and 30 VMs on it. Some of them also add Horizon View (Add-On) to it.