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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for October 19th, 2021

The hard part of a crypto specification: make it safe and misuse resistant.

Posted by jpluimers on 2021/10/19

Great quote from a while back:

[WayBack] Filippo Valsorda on Twitter: “Here’s a secret: it’s not that hard to put together a crypto specification. What’s hard is to make it safe and misuse resistant. What needs to be “battle tested” is the security devex, not the narrow happy path, and blaming the developer when it breaks is not battle testing.”

From the same thread:


Read the rest of this entry »

Posted in Development, Power User, Security, Software Development | Leave a Comment »

VMware ESXi has 2 bootbanks; with some luck the second contains your old ESXi version

Posted by jpluimers on 2021/10/19

Just in case I ever need this again:

  • [Wayback] VMware Knowledge Base: Reverting to a previous version of ESXi (1033604)
    1. In the console screen of the ESXi host, press Ctrl+Alt+F2 to see the Direct Console User Interface (DCUI) screen.
    2. Press F12 to view the shutdown options for the ESXi host.
    3. Press F11 to reboot.
    4. When the Hypervisor progress bar starts loading, press Shift+R. You will see the warning:
      Current hypervisor will permanently be replaced
      with build: X.X.X-XXXXXX. Are you sure? [y/n]
    5. Press Y to roll back the build.
    6. Press Enter to boot.
  • [Wayback] Downgrade ESXi 6.5 from update 3 to update 2 – VMware Technology Network VMTN; when out of luck:
    • This is not my case.As I mentioned, I don’t have altbootbank with update 2. This is because after update 3, I also installed the latest patch.So both bootbanks now have update 3.Is there any other option for me. Can I just install update 2 again so it will overwrite everything? Or it is impossible?
    • Backup ESXi configurations and reinstall it without overwriting VMFS.

Via: [Wayback/] downgrade esxi 6.5 u3 to u2 – Google Search


Posted in ESXi6, ESXi6.5, ESXi6.7, ESXi7, Power User, Virtualization, VMware, VMware ESXi | Leave a Comment »

EProgrammerNotFound exception in Delphi? – Stack Overflow

Posted by jpluimers on 2021/10/19

From a long while my answer to [WayBack] EProgrammerNotFound exception in Delphi? – Stack Overflow (I added the WayBack links)

It was introduced in Delphi 2009, still present in Delphi 2010, and [WayBack] recently got some [WayBackmore attention on the [WayBackinternet.

I think it is an easter egg, similar to [WayBack] “EBCAK” (Error Between Chair and Keyboard), and the [WayBack] skipping of Delphi version number 13.

[WayBack] EProgrammerNotFound

  • is declared in the Win32 branch of the SysUtils unit, but not used anywhere in the RTL or VCL
  • is not present in Delphi Prism
  • was introduced in Delphi 2009, so not present in VCL.NET
  • has currently (version 3.5) nothing similar in the .NET framework (not sure why, these guys [WayBack] do have humour)

I don’t think EProgrammerNotFound is actually meant to be used at all, but since it is there, people will jokingly use it (similar like putting a stray “const False = True; True = not False;” in someone elses sourcecode).

On green bits and red bits (which I highly associate with the “green wobbly bit”:


Posted in Delphi, Development, Software Development | Leave a Comment »

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