====== Remote access to the observatory ======

===== Remote Desktop Protocol (RDP) ======

In this section we explain how to access our observatory remotely using the Remote Desktop Protocol (RDP). 

==== Linux: ====
For Linux users we recommend **Remmina**, which to our knowledge is available in the repositories of all major distributions. Nevertheless, the following configuration is in principle transferable to any other RDP client. 

{{ ost:software:remmina_1.png?400 |Remmina: Main window}}

After **Remmina** has been started, the first thing to do is to create a new profile by clicking on the button in the upper left corner (see image above). The fields ''Name'', ''Group'', ''Server'', ''Username'' and ''Password'' must be set (see image below). ''Name'' is the name of the profile, which can be chosen freely. ''Group'' must be set to //WORKGROUP//. ''Server'' is the IP of the Observatory Management System (OMS). The ''Username'' for daily use is //BP34_User//. ''Password'' is self-explanatory. ''Server'' and ''Password'' will be provided on request. 

{{ ost:software:remmina_2.png?400 |Remmina: Profile configuration window}}

If access is not via the local IP address space, an SSH tunnel must be established. To do this, you should select the ''SSH Tunnel'' tab in the profile configuration-window (see image below). After that you have to select ''Custom'', set the server name to one of the computers of the Astro Cluster, e.g. //prakt.astro.physk.uni-potsdam.de// and use a valid ''user name'' like //castor//. If authentication is not done by public key cryptography, the ''Password'' must be set as well. 

{{ ost:software:remmina_3.png?400 |Remmina: SSH configuration}}

After saving the configuration, the connection can be established at any time by double-clicking on the corresponding entry. 

{{ ost:software:remmina_4.png?400 |Remmina with completed configuration}}

==== Windows: ====

=== RDP client from Microsoft ===

For Windows, **Remote Desktop Connection** from Microsoft can be used. After **Remote Desktop Connection** has been started, a new profile should be created. To do this, first click on "Show options".

{{ en:ost:software:rdc:rdc_1.png |}}

Afterwards the IP or the URL of the Observatory Management System (OMS) can be entered under ''Computer''. Furthermore the ''User name'' must be set, which is composed of the computer name and the account name as follows:

   DESKTOP-6QQIP9S\BP34_User

The name of the computer and account is //DESKTOP-6QQIP9S// and //BP34_User//, respectively.

The IP and password will be provided upon request.

If the credentials are to be saved, the option ''Allow me to save credentials'' must be activated. 

{{ en:ost:software:rdc:rdc_3.png |}}

The connection can be established by clicking on ''Connect''. You will then be asked for the credentials. If entered correctly, the connection will be established. 

Unfortunately **Remote Desktop Connection** does not support tunneling into the university network via SSH or any other free software. From outside the university network a connection has to be established, e.g., via a SSH tunnel. For this purpose a SSH client like **PuTTY** is recommended. We will not go into further details on how to configure this, since detailed instructions are already available on the Internet (see e.g. [[https://www.saotn.org/tunnel-rdp-through-ssh/|www.saotn.org]]). 

=== Alternative to the RDP client from Microsoft - MobaXterm ===

Alternatively, [[http://mobaxterm.mobatek.net/|MobaXterm]] can be used under Windows. Via [[http://mobaxterm.mobatek.net/|MobaXterm]], in contrast to the RDP client of Windows, an SSH tunnel can be established, which is called "SSH jump host". First of all a new session has to be established and for this the **RDP** protocol has to be selected. Click **RDP** and make the basic settings. As **Remote host** the IP of the OMS has to be specified, which will be disclosed on request. As **username** you have to enter ''BP34_User'' again. 

<WRAP group>
<WRAP half column>
{{ ost:software:moba-x-term_rdp_1.jpg |}}
</WRAP>
<WRAP half column>
{{ ost:software:moba-x-term_rdp_2.jpg |}}
</WRAP>
</WRAP>

<WRAP group>
<WRAP half column>
{{ ost:software:moba-x-term_rdp_3.jpg |}}
</WRAP>
<WRAP half column>
In the second step, the tab **Network settings** must be selected. There you have to click on **SSH gateway (jump host)** to specify the SSH host. Don't be surprised there are no changes shown in this window, after the next step.

In the window that opens, the **Gateway host** must be specified. In the example shown here we used ''columba'' but basically any host from the Astro domain can be used for this. The **Username** has to be chosen accordingly. 

By clicking **OK** the settings of the corresponding windows can be confirmed. Afterwards the connection can be established. 
</WRAP>
</WRAP>


===== TeamViewer ======

**TeamViewer** is a proprietary software for remote access to computers, online meetings and conferences, which can be used free of charge for non-commercial purposes. It is characterized by an extremely simple handling. To log in to a remote computer, only the ID of the remote computer and the associated password are required. The ID must be entered under ''Partner ID'', while the password is requested after clicking the ''Connect'' button. 

{{ en:ost:software:teamviewer:teamviewer_1.png?450  |}}

Both the ID and the password will be provided upon request.

The big disadvantage of **TeamViewer** is that it only works if an account is already logged into the computer and **TeamViewer** is started.


===== Virtual Network Computing (VNC) ======

May still be completed...