• Android

  1. Open your web browser and download the certificate from the following URL:

     http://wlan-support.spk-berlin.de/downloads/certs/T-TeleSec_GlobalRoot_Class_2.crt

  2. To install the certificate, navigate to

     Menu → Settings → Security → Install from SD card/USB store.

  3. Name the certificate, e.g. "Telekom Root Certificate".
  4. Depending on the version, Android will ask you for a purpose for the certificate.
     The "Wi-Fi" setting must be selected here.
  5. Now you should no longer receive an error message when you access the certificate.

• Windows

  1. The easiest way to install the certificate is to use Internet Explorer (even older versions)
  2. Start Internet Explorer and download the certificate from the following URL:

     http://wlan-support.spk-berlin.de/downloads/certs/T-TeleSec_GlobalRoot_Class_2.crt

  3. When you are asked whether Internet Explorer should save or open the file, select Open. Follow the Setup-Wizard until the message "The import was successful" appears.
  4. The certificate is now installed in the Windows certificate store.
  5. Now you should no longer receive an error message when you access the certificate.

^* T-TeleSec GlobalRoot Class 2 from T-Systems/Deutsche Telekom