Failed to create persistent connection to ADMIN$ shared folder on host

Recently I got the chance to redesign the existing backup environment of a customer. The customer has been successfully using Veeam Backup & Replication for years, but the environment has been growing over the years and therefore the backup environment has been adjusted from time to time. After an unpleasant data loss mid-year, the customer decided to give us the task of revising his backup environment.

As part of the design, we decided to leave all components of the backup environment outside the customer’s productive Active Directory domain and only connect where absolutely necessary. In general this works without problems, only the installation and configuration of additional, Windows-based Managed Servers to use them for example as remote backup repository requires some additional attention. If we try to add the Managed Server in the Veeam Backup & Replication Console and do not use the default Account Administrator (UID 500), the installation of the necessary Veeam Services fails due to Remote UAC being enabled by default.

Failed to create persistent connection to ADMIN$ shared folder on host.

The problem can be solved in two ways:

  1. Use the default Administrator user (UID 500).
  2. Create a registry entry as described in this Microsoft KB article.

As we do not want to use a standard account in our design (a general recommendation), we use dedicated service accounts and therefore rely on the second solution. For those of you who don’t want to read the Microsoft article here are the steps you need to perform on the managed server.

Resolution

  1. Launch regedit (Click Start, type regedit and press ENTER).
  2. Navigate to the following register entry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
  3. Create a new DWORD value (32-Bit) with the following name:
    LocalAccountTokenFilterPolicy
  4. Assign the new DWORD the value 1.

After creating the registry entry, adding the Managed Server and installing the Veeam Services works without any problems.

My (online proctored) VMCE 2020 experience

Right before my vacation I reached a goal, which was actually already on my list for 2019. I tried and managed to get the Veeam Certified Engineer (VMCE) certification in the 2020 edition. This was also my first online proctored exam. So in the following I would like to tell you why it took so long since my Veeam Configuration and Management training in 2019 and what experiences I made with the 2020 exam in the „Remote Edition“.

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Using vSphere Custom Attributes with Veeam Backup & Replication

Most of my customers now use tag-based backup with Veeam Backup & Replication to protect their business-critical applications and services. This ensures that they no longer need to perform any configuration within the backup software to protect their workloads. Only the individual adjustments of the Guest Credentials for Application-Aware Processing have to be done in the Veeam Console. The added value you have by doing this I have already covered in another blog post.
In the ever accelerating IT world and the changes that come along with it, it is extremely important for my customers to be able to make fast and reliable statements about the data backup status of certain systems. Since we use vSphere tags to perform nearly all of our backup administration from within vCenter, it would be consistent to have the appropriate status information available at this location as well. This is where the Notification Settings within the Advanced Backup Settings come into play. How you can configure simple status updates in vCenter without installing additional plug-ins or tools, and what you should consider when doing so, I‘ ll show you below.

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Backup fails with „Cannot find Linux guest credentials“ in Veeam Backup & Replication v10

Yesterday I had a scheduled update of his Veeam Backup & Replication installation with one of my customers. We planned to go from version 9.5 Update 4b (9.5.4.2866) to version 10 GA (10.0.0.4461).

As usual, I created an encrypted configuration backup before the update for safety reasons. How this works and why you should encrypt the configuration backup you can read here and here. I prefer to be a little more cautious at this point, before I have the trouble in hindsight. However, I did not need the configuration backup. The update went smoothly and without problems.

Since I carried out the update during the day, it was not possible, in agreement with the customer, to perform a complete backup run directly after the update. Therefore, I did a short functional test using the Quick Backup capabilities of Veeam Backup & Replication. There were no problems here either.

Today the customer called and reported about failed backup jobs. So I looked into it:

Version 10 GA: Unable to connect to guest OS for guest processing. Cannot find Linux guest credentials
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