Con­fig­ure­VPN un­der Mac OS

Hint 2025

Due to the certification-provider change, the VPN configs need to be adapted by 12/2025:
a) an additional Certificate-Authority (CA) file: HARICA_CA_Chain.pem [existing: Sectigo_CA_Chain.pem]
b) change file math.ovpn: replace Sectigo_CA_Chain.pem with HARICA_CA_Chain.pem

Install Tunnelblick

  1. Download the program in the latest stable version and install it
  2. Confirm all dialogs during installation and enter your local credentials if needed

Configure VPN under Mac OS

  1. Download the math.tblk file.
  2. If the file has a different extension than the one mentioned above, it must be unzipped beforehand (math.tblk.zip).
  3. Double-click on math.tblk to install the configuration in Tunnelblick
  4. Install the configuration for this user only (then confirm with local access data)


Establish VPN connection

You can simply start Tunnelblick from your program folder. At the first start after the configuration you will be asked for your local access data for configuration purposes. 

Afterwards you can select 'math' as VPN in Tunnelblick. (Click on the icon in the status bar at the top of the screen).

Enter your RBM username and VPN password as user data here.

Important: This is not the normal password (e.g. for webmail) but a separate one. If you do not yet have VPN access data or if you have forgotten your password, please contact a member of the RBM.

Further information: