This was a Windows Server 2019 that would log the following error every hour:

The atc service failed to start due to the following error:
Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.

Inspecting the registry, the following was found:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\atc

which had an ImagePath with file C:\Windows\System32\drivers\atc.sys

Under the Properties-Details menu of atc.sys, its description indicated it to be associated with BitDefender Active Threat Control Filesystem Minifilter (AntiVirus), however this was not currently installed on the server.

The service was uninstalled using the command prompt:

sc delete atc

To find other Bitdefender leftovers, add Product Name to the Windows  file explorer columns then sort and look for Bitdefender. I found several others:

Trufos.sys (Bitdefender Antivirus Kernel Module)
bddci.sys (Bitdefender BDDCI filter driver)
gzflt.sys (Bitdefender Gonzales File System Driver)
ignis.sys (Bitdefender IGNIS Firewall)

sc delete trufos
sc delete bddci
sc delete gzflt
sc delete ignis

Then reboot to flush the deleted services.

When trying to perform a File Backup job using Veeam Backup and Replication (specifically version 10.0.0.4461) it would randomly fail with An unexpected network error occurred. This backup job was configured to backup a local NFS File Share to a local SMB (CIFS) backup repository. Repeating the job would result in another failure but differing amounts of data being transferred each time.  After the failure, the job report listed items such as NasMaster.ExecuteBackupProcessor and boost::filesystem::status:.

It continued to fail even after setting the Backup I/O control of the NFS File Share to the lowest impact value. To resolve it the backup repository was switched from SMB/CIFS to NFS.  After this change the Backup I/O control setting was also reset back to the default (middle) value.  This solution likely indicates a problem with the destination (backup repository), so if you need to keep it as SMB/CIFS then you can try adjusting the Load Control settings of the repository (right click Properties menu -> Repository). For example try reducing the maximum number of concurrent tasks. If it fails with just 1 task then you may also need to try limiting the data rate.

If you forgot the login credentials for the web account, here is how to perform the reset.

1. Access the VM appliance console
2. Stop the PowerChute service

   /etc/init.d/PowerChute stop

3. Edit the configuration file

   vi /opt/APC/PowerChute/group1/pcnsconfig.ini

4.  In the [NetworkManagementCard] section of the INI file, add the following lines with your desired values:
   username= new user name
   password= new password
5. Save and close
6. Restart the PowerChute service

   /etc/init.d/PowerChute start

A CyberPower CP1500AVRLCD unit originally came with two batteries, B.B. Battery HR1234W with dimensions 6.00 x 2.60 x 3.70 in. (LxWxH).  If you replaced them and forgot how to wire them back up, you can refer to the below diagram: