Author Archives: krylon

UniFi Controller Notifications using a STARTTLS Mail Server

Recent issue with UniFi Controller (version 5.12.35) where test emails were failing on a remote SMTP server (Postfix) configured for STARTTLS listening on port 25. The workaround was to open port 587 on the firewall and redirect it to port … Continue reading

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Errno 28 When Trying to Update VMware ESXi 6.7.0 Update 2 to Update 3

When trying to update/upgrade ESXi 6.7.0 Update 2 to Update 3 (via software profile update command) you may run into the following error below. This was a host running specifically Update 2 build 13644319. [InstallationError] [Errno 28] No space left … Continue reading

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Create a custom alias for a RemoteApp in Windows Server 2012 R2

For Windows Server 2012 R2 it’s not possible to change the alias of an existing RemoteApp. However it is possible to set a custom alias when creating a new RemoteApp using PowerShell.  The steps: Unpublish the existing RemoteApp Start PowerShell … Continue reading

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Adjust Date/Time in Windows Server 2019

When attempting to change the timezone in Windows Server 2019 you may run into the following problems: The change button in Windows Settings for Date & Time is greyed out Receive an error message when clicking Change Time Zone button … Continue reading

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Let’s Encrypt Suddenly Failing to Renew a Certificate

On a Ubuntu 18.04 bionic system I suddenly started getting errors with certbot for one domain while certificates for other domains on the same system were renewing without errors.  Performing a –dry-run would result in various error messages, such as: … Continue reading

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Unable to Delete User Profiles Windows 7

I had a situation where the Delete button was grayed out  / disabled when attempting to delete a user account on a Windows 7 machine. This occurred when logged in with an account with full administrator privileges.  The solution was … Continue reading

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Solid Activity Light on Backplane for SAS Drive

I recently acquired some SAS hard drives but when installed in a Norco SATA/SAS backplane the activity light was always on when idle (for this backplane, the light was a constant green). This behavior was opposite of the SATA drives … Continue reading

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Acquiring Real IP of Client with NGINX, Apache and WordPress (also with Cloudflare)

For this particular example I was trying to block brute force authentication to WordPress using the Limit Login Attempts Reloaded plugin.  This setup had an NGINX proxy in front of Apache that was serving a WordPress instance as a Virtual … Continue reading

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Windows Server 2019 (and 2016) Evaluation Product Key Activation Error

When activating Windows Server 2019 (Standard or Datacenter) installed with an Evaluation ISO, you receive an error The product key you entered didn’t work. Check the product key and try again, or enter a different one. (0x80070032) The solution is … Continue reading

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Openmediavault 4.x and Windows 10 Shared Folder Errors

When trying to access an SMB share running on openmediavault you may get some of the following error messages, even though permissions have been set up correctly on the server and the correct password is being provided by the client: … Continue reading

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