Today between 15:00 and 17:40 there were problems with the connection between the TUnet and the Internet due to an external attack. The connectivity is now restored.
Today (14th August 2019) there were problems between 15:00 and 17:40 with the accessibility of the internet from the TUnet and vice versa.
Responsible for this was an external attack, which overcrowded the table of open connections (sessions) on the Internet Firewall of the Vienna University of Technology, so that no new connections were allowed through.
The attack is over now and the connectivity between the TUnet and the Internet is restored.