---
title: "Amplia Reg command: **fill-registration-agents-certificate-thumbprint**"
description: "Amplia Reg command that fills in the SHA-256 certificate thumbprint of registration agents registered before version 6.3.0."
canonical: "https://docs.lacunasoftware.com/en-us/articles/amplia-reg/on-premises/tool/fill-registration-agents-certificate-thumbprint"
locale: "en"
product: "Amplia Reg"
last_updated: "2026-10-12"
---

# Amplia Reg command: **fill-registration-agents-certificate-thumbprint**

## Name

`fill-registration-agents-certificate-thumbprint` - Fills in the certificate thumbprint of existing registration agents

## Syntax

```sh
dotnet Lacuna.AmpliaRegNg.Site.dll [settings] -- fill-registration-agents-certificate-thumbprint [options]
```

Or, on Docker:

```sh
docker run -i lacunasoftware/ampliareg:x.y.z [settings] -- fill-registration-agents-certificate-thumbprint [options]
```

> **Info**
>
> Replace `x.y.z` above with the desired version

The `settings` arguments are additional settings to overwrite settings from configuration files and environment variables,
for instance `--Section1:Name1=value1 --Section2:Name2=value2`.

Options:

* `--batchsize <batch-size>`: number of registration agents to process per batch. Default: 100
* `--logfrequency <log-frequency>`: how often, in number of processed agents, progress is written to the log. A value less than or equal to zero turns this log off. Default: 5

## Description

The `fill-registration-agents-certificate-thumbprint` command finds registration agents that already have a certificate on record but
don't have the (SHA-256) thumbprint of that certificate filled in yet, computes the thumbprint from the stored certificate and saves it
on the agent.

This field was added in version [6.3.0](https://docs.lacunasoftware.com/en-us/articles/amplia-reg/changelog#6.3.0) and is filled in automatically for new registrations and certificate
updates from that version on; registration agents registered **before** it need this command to have their thumbprint filled in.

Before processing, the command shows the number of agents found and asks for confirmation (`Y`) before going ahead, since the action cannot be undone.

## See also

* [Amplia Reg command-line tool](https://docs.lacunasoftware.com/en-us/articles/amplia-reg/on-premises/tool)