> For the complete documentation index, see [llms.txt](https://docs.helmut.de/helmut4-releases/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.helmut.de/helmut4-releases/v4.10.1/getting-started/tech-specs/commonly-used-ports.md).

# Commonly used ports

### Client - Server - Infrastructure Communication

The table provided below enumerates the commonly used ports for both the Helmut server and client.

<table><thead><tr><th width="214.33333333333331">Type</th><th width="143">Protocol</th><th>Port</th><th>Notes</th></tr></thead><tbody><tr><td>MoovIT's repository<br>repo.moovit24.de</td><td>TCP</td><td>443</td><td>needed to update / install new version</td></tr><tr><td>DNS</td><td>TCP</td><td>53</td><td></td></tr><tr><td>SMB</td><td>TCP</td><td>137, 138, 139, 445</td><td>may vary depending on the storage</td></tr><tr><td>LDAP</td><td>TCP &#x26; UDP</td><td>389</td><td></td></tr><tr><td>SMTP</td><td>TCP</td><td>25</td><td></td></tr><tr><td>Helmut Client</td><td>TCP</td><td>80, 443</td><td>Depending if SSL is enabled</td></tr><tr><td>Portainer</td><td>TCP</td><td>9000</td><td></td></tr></tbody></table>

### Server - WAN Communication

The host operating system should have access to its own repository for updates, upgrades, and installation of additional dependencies or packages.

This also includes common Docker repository URLs, such as docker.com and docker.io, which are essential for updating the Docker environment and pulling new images for applications like Portainer.


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