Be advised - for access to your server folders from home, follow the instructions provided in the link:

https://www.polsoz.fu-berlin.de/verwaltung/it-service/faq/index.html#faq_daten_extern 

Those of you who use Exchange, please use the OWA portal. Instructions in the following link:

https://www.polsoz.fu-berlin.de/verwaltung/it-service/faq/index.html#faq_exchange-extern