ICT services

ISSC services

This page attempts to describe the current LIACS ICT landscape, which is part of Leiden University's ICT infrastructure as provided by the ISSC.

Research and Education Laboratory (REL) and sublabs

  • The LIACS Research and Education Laboratory (REL) (link only internally accessible) provides additional services for LIACS staff and students. This lab includes, amongst other things, the high performance computing servers DAS-5, the Little Green Machine (LGM), and the Data Science lab (link only internally accessible). 


Generally, you will need your ULCN username so that the helpdesk can identify you. 

Sometimes, it helps to mention that you work (or are are student) at LIACS so that the appropriate responsible employee within the ISSC can be found more quickly.
If you know the name of the ISSC employee likely responsible for handling your request, you can mention this name in your call to speed up the process.
For an issue which is not directly resolved after calling, insist on a helpdesk issued support ticket ID to reference your issue in the future.

If for some reason your support call is not handled adequately or quickly enough by the ISSC, then in cooperation with the LIACS ICT Coordinator (institute manager) issues can be escalated to Hans van Eck, the ISSC service manager for LIACS.


Under Linux, the shared folder for LIACS can be found at
It should be possible to share large files between LIACS staff and students through this folder without  limitations.
There should also be facilities to share files under Windows.


  • All standard university workstations are managed by the ISSC, see the ISSC page on workstations
  • Staff members can choose to have a fully self managed machine, either within the ISSC domain or directly within the LIACS REL network. Contact the ICT coordinator (institute manager) to get your choice executed.


  • The LIACS wireless access point wlan 3 which also provides access to the LIACS Research and Education Lab (REL).
    This access point is only available in the Snellius building.
    Password can be obtained by asking a fellow student or staff member.

Remote access

  • Instructions are provided in the ISSC manuals.
  • The ISSC does not offer VPN access. VPN is however available for LIACS staff and students via the Research and Education Lab, see


Under Linux, some shared software such as Xilinx, R, Eclipse and Matlab is available via /vol/share/software/
There is a '<xy>-README" with instructions on how to use the package. For multiple versions the subfolders are listed per version.


  • Instructions are provided in the ISSC manuals.
  • Additional LIACS-specific instructions can be found at the REL website.


Students have an uMail e-mailaddress which looks like
LIACS staff members have an address which looks like
and by default also the username alias  
which is essentially
Legacy e-mail addresses: all LIACS students and LIACS staff enrolled or employed before 2014 als had an e-mail address. These addresses should all have been forwarded to the new addresses. In case of problems or e-mail addresses that are no longer being properly redirected, the ISSC can fix forwards upon request.


You can send an e-mail to any one of the following mailinglists if you are on this list yourself.

  • - all "LIACS inhabitants" of the Snellius building: payed employees, PhD students and and guests
  • - all LIACS teaching staff
  • - all LIACS PhD studentes with an office in the Snellius building
  • - all LIACS scientific personnel with an office in the Snellius building
  • - all scientific supervising LIACS personnel (group leaders etc.)

The ISSC or alternatively within LIACS, Vian Govers, can make additional mailinglists (with mailman).


All LIACS staff and students should have access to the LIACS-ISSC webserver named
It publishes user websites at
You can connect to it only from within the university domain. It can be accessed via SSH and SFTP. Use your ULCN credentials, and place your website in the public_html folder.

A document on this webserver and the connected MySQL server (for which (internally) a PHPMyAdmin is available via has been written by the ISSC.

To provide easy access to your website from your regular Linux workstation in the folder ~/public_html, you can manually mount your public_html folder on the webserver in your regular homedirectory using sshfs, for example as follows on a workstation:
mkdir ~/public_html (once)
sshfs <user><user>/public_html ~/public_html
(each time you want to mount your public_html folder, <user> is your ULCN username)
You can place a script with the above line in your "usr/bin" folder so that you can mount your website with one simple command.

To see PHP errors, you should place a file named .htaccess in your public_html folder containing the text php_flag display_errors on
Then, you should explicitly state on top of your script that you want to see errors, for example using the PHP command error_reporting(E_ALL);

File access is arranged using ACLs (e.g., through setfacl and getfacl). For example, to give the webserver write access to a folder, use:
setfacl -R -m group:www:rwx /path/to/rw/folder
setfacl -R -m default:www:rwx /path/to/rw/folder

sshfs public_html2

Managing publications (staff only)

Throughout the year, all LIACS staff members are encouraged to keep their publication lists up to date through CONVERIS (authenticate using ULCN).
A few tips for using Converis:

  • Fill in the "Internal Authors"
  • Fill in "All Authors" in the same layout as the "Internal Authors"
  • Always fill in the "Year"
  • Submit to repository: fill in "No"
  • Always fill in the "Research Area", which you find under "2. Thematic Classification": choose between (1) Algorithms and the Foiundations of Software Technology or (2) Computer Systems, Imagery and Media
  • Validated by WD: "No"

If you keep your list up to date, it will also automatically be updated on the profile pages on the university webpage. Assistance on Converis can be provided by the LIACS secretary.

Last edited on 01 Jan 2020 at 19:02