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--- ---
title: Remote Desktop Access title: Remote Desktop Access
#tags: keywords: NX, nomachine, remote desktop access, login node, login001, login002, merlin7-nx-01, merlin7-nx-02, merlin7-nx, rem-acc, VPN, browser access
keywords: NX, nomachine, remote desktop access, login node, login001, login002, merlin7-nx-01, merlin7-nx-02, merlin7-nx, rem-acc, vpn last_updated: 07 August 2024
last_updated: 07 September 2022
#summary: ""
sidebar: merlin7_sidebar sidebar: merlin7_sidebar
permalink: /merlin7/nomachine.html permalink: /merlin7/nomachine.html
--- ---
Users can login in Merlin through a Linux Remote Desktop Session. NoMachine Users can log in to Merlin through a Linux Remote Desktop Session. NoMachine is a desktop virtualization tool similar to VNC, Remote Desktop, etc. It uses the NX protocol to enable a graphical login to remote servers.
is a desktop virtualization tool. It is similar to VNC, Remote Desktop, etc.
It uses the NX protocol to enable a graphical login to remote servers. ## New Feature: Browser-Based Access
We have now enabled browser-based access to Merlin7. This allows users to connect to the NoMachine service directly through a web browser, removing the need to install a client application. This is accessible via the following URL:
- **Browser Endpoint**: [https://merlin7-nx.psi.ch:4443](https://merlin7-nx.psi.ch:4443)
### How to Connect via Browser
1. Open your web browser and navigate to [https://merlin7-nx.psi.ch:4443](https://merlin7-nx.psi.ch:4443).
2. Enter your credentials when prompted. **Do not add `PSICH\`** as a prefix for the username.
3. Follow the on-screen instructions to launch a new session or reconnect to an existing one.
## Installation ## Installation
NoMachine is available for PSI Windows computers in the Software Kiosk under the For traditional access, NoMachine is available for PSI Windows computers in the Software Kiosk under the name **NX Client**. Please use the latest version (at least 8.1.3). For macOS and Linux, the NoMachine client can be downloaded from [https://www.nomachine.com/](https://www.nomachine.com/).
name **NX Client**. Please use the latest version (at least 8.1.3). For MacOS and
Linux, the NoMachine client can be downloaded from https://www.nomachine.com/.
## Accessing Merlin7 NoMachine from PSI ## Accessing Merlin7 NoMachine from PSI
The Merlin7 NoMachine service is hosted in the following machine: The Merlin7 NoMachine service is hosted on the following machine:
* **`merlin7-nx.psi.ch`** - **`merlin7-nx.psi.ch`**
This is the **front-end** (hence, *the door*) to the NoMachine **back-end nodes**, This is the **front-end** (hence, *the door*) to the NoMachine **back-end nodes**, which contain the NoMachine desktop service. The **back-end nodes** are the following:
which contain the NoMachine desktop service. The **back-end nodes** are the following:
* `login001.merlin7.psi.ch` - `login001.merlin7.psi.ch`
* `login002.merlin7.psi.ch` - `login002.merlin7.psi.ch`
Any access to the login node desktops must be done through **`merlin7-nx.psi.ch`** . Any access to the login node desktops must be done through **`merlin7-nx.psi.ch`**.
{% comment %} The **front-end** service running on **`merlin7-nx.psi.ch`** will load-balance the sessions and log in to any available nodes in the **back-end**.
(or from **`rem-acc.psi.ch -> merlin7-nx.psi.ch`** when connecting from outside PSI).
{% endcomment %}
The **front-end** service running on **`merlin7-nx.psi.ch`** will load balance the sessions **Only one session per back-end** is possible.
and login to any of the available nodes in the **back-end**.
**Only 1 session per back-end** is possible. Below are all the steps necessary for configuring access to the NoMachine service running on a login node.
Below are explained all the steps necessary for configuring the access to the ### Creating a Merlin7 NoMachine Connection
NoMachine service running on a login node.
### Creating a Merlin7 NoMachine connection #### Adding a New Connection to the Front-End
#### Adding a new connection to the front-end Click the **Add** button to create a new connection to the **`merlin7-nx.psi.ch` front-end**, and fill up the following fields:
Click the **Add** button to create a new connection to the **`merlin7-nx.psi.ch` front-end**, and fill up - **Name**: Specify a custom name for the connection. Examples: `merlin7-nx`, `merlin7-nx.psi.ch`, `Merlin Desktop`
the following fields: - **Host**: Specify the hostname of the **front-end** service: **`merlin7-nx.psi.ch`**
* **Name**: Specify a custom name for the connection. Examples: `merlin7-nx`, `merlin7-nx.psi.ch`, `Merlin Desktop` - **Protocol**: Specify the protocol that will be used for the connection. *Recommended* protocol: **`NX`**
* **Host**: Specify the hostname of the **front-end** service: **`merlin7-nx.psi.ch`** - **Port**: Specify the listening port of the **front-end**. It must be **`4000`** for the **`NX`** protocol.
* **Protocol**: specify the protocol that will be used for the connection. *Recommended* protocol: **`NX`**
* **Port**: Specify the listening port of the **front-end**. It must be **`4000`**.
![Create New NoMachine Connection]({{ "/images/NoMachine/screen_nx_connect.png" }}) ![Create New NoMachine Connection]({{ "/images/NoMachine/screen_nx_connect.png" }})
#### Configuring NoMachine Authentication Method #### Configuring NoMachine Authentication Method
Depending on the client version, it may ask for different authentication options. Depending on the client version, it may ask for different authentication options. If required, choose your authentication method and **Continue** (**Password** or *Kerberos* are recommended).
If it's required, choose your authentication method and **Continue** (**Password** or *Kerberos* are the recommended ones).
You will be requested for the crendentials (username / password). **Do not add `PSICH\`** as a prefix for the username. You will be requested for the credentials (username/password). **Do not add `PSICH\`** as a prefix for the username.
### Opening NoMachine desktop sessions ### Opening NoMachine Desktop Sessions
By default, when connecting to the **`merlin7-nx.psi.ch` front-end** it will automatically open a new By default, when connecting to the **`merlin7-nx.psi.ch` front-end**, a new session automatically opens if none exists.
session if none exists.
If there are existing sessions, instead of opening a new desktop session, users can reconnect to an If there are existing sessions, users can reconnect to an existing one instead of opening a new desktop session by clicking the appropriate icon (see image below).
existing one by clicking to the proper icon (see image below).
![Open an existing Session]({{ "/images/NoMachine/screen_nx_existingsession.png" }}) ![Open an existing Session]({{ "/images/NoMachine/screen_nx_existingsession.png" }})
Users can also create a second desktop session by selecting the **`New Desktop`** button (*red* rectangle in the Users can also create a second desktop session by selecting the **`New Desktop`** button (*red* rectangle in the image below). This will create a second session on the second login node as long as it is up and running.
below image). This will create a second session on the second login node, as long as this node is up and running.
![Open a New Desktop]({{ "/images/NoMachine/screen_nx_newsession.png" }}) ![Open a New Desktop]({{ "/images/NoMachine/screen_nx_newsession.png" }})
### NoMachine LightDM Session Example ### NoMachine LightDM Session Example
An example of the NoMachine session, which is based on [LightDM](https://github.com/canonical/lightdm) An example of the NoMachine session, which is based on [LightDM](https://github.com/canonical/lightdm) X Windows:
X Windows:
![NoMachine Session: LightDM Desktop]({{ "/images/NoMachine/screen_nx11.png" }}) ![NoMachine Session: LightDM Desktop]({{ "/images/NoMachine/screen_nx11.png" }})
## Accessing Merlin7 NoMachine from outside PSI ## Accessing Merlin7 NoMachine from Outside PSI
### No VPN access ### No Direct Access Without VPN
No VPN access from outside is not possible for the pre-production phase, since it requires advanced network knowledge to do so, and the external **rem-acc.psi.ch** During the pre-production phase, direct access to the NoMachine service from outside the organization is not supported. To access the service, you must first connect to PSI's VPN. The external **rem-acc.psi.ch** service does not yet allow direct access to the new cluster without a VPN connection.
service does not allow access to the new cluster yet.
{% comment %} ### VPN Access
Access to the Merlin7 NoMachine service is possible without VPN through **'rem-acc.psi.ch'**.
Please follow the steps described in [PSI Remote Interactive Access](https://www.psi.ch/en/photon-science-data-services/remote-interactive-access) for
remote access to the Merlin7 NoMachine services. Once logged in **'rem-acc.psi.ch'**, you must then login to the **`merlin7-nx.psi.ch` front-end** .
services.
{% endcomment %}
### VPN access
Remote access is also possible through VPN, however, you **must not use 'rem-acc.psi.ch'**, and you have to connect directly
to the Merlin7 NoMachine **`merlin7-nx.psi.ch` front-end** as if you were inside PSI. For VPN access, you should request
it to the IT department by opening a PSI Service Now ticket:
[VPN Access (PSI employees)](https://psi.service-now.com/psisp?id=psi_new_sc_cat_item&sys_id=beccc01b6f44a200d02a82eeae3ee440).
Remote access is possible through VPN; however, you **must not use 'rem-acc.psi.ch'**, and you have to connect directly to the Merlin7 NoMachine **`merlin7-nx.psi.ch` front-end** as if you were inside PSI. For VPN access, you should request it from the IT department by opening a PSI Service Now ticket: [VPN Access (PSI employees)](https://psi.service-now.com/psisp?id=psi_new_sc_cat_item&sys_id=beccc01b6f44a200d02a82eeae3ee440).
## Advanced Display Settings ## Advanced Display Settings
**Nomachine Display Settings** can be accessed and changed either when creating a new session or by clicking the very top right corner of a running session. **NoMachine Display Settings** can be accessed and changed when creating a new session or by clicking the top right corner of a running session.
### Prevent Rescaling ### Prevent Rescaling
These settings prevent "bluriness" at the cost of some performance! (You might want to choose depending on performance) These settings prevent "blurriness" at the cost of some performance! (You might want to choose depending on performance)
* Display > Resize remote display (forces 1:1 pixel sizes)
* Display > Change settings > Quality: Choose Medium-Best Quality
* Display > Change settings > Modify advanced settings
* Check: Disable network-adaptive display quality (diables lossy compression)
* Check: Disable client side image post-processing
- Display > Resize remote display (forces 1:1 pixel sizes)
- Display > Change settings > Quality: Choose Medium-Best Quality
- Display > Change settings > Modify advanced settings
- Check: Disable network-adaptive display quality (turns off lossy compression)
- Check: Disable client-side image post-processing