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If you have taken additional security measures or have a router installed for example, you must ensure that communication with the conference server is possible.

Accordingly, the following components have to be available for the duration of the online conference:

      - IP addresses of the conference server: 194.29.226.34 to 158
      - Communication port: 4500

Note for organizers
In order to use the Supervisor-Tool, port 4501 must also be open.

General notes regarding firewalls
If the OpenSpace-Online® conference software is blocked due to a firewall, one can generally choose from the following possibilities:

a.)	The firewall automatically asks the user whether the conference software may be executed. In this case, it is usually sufficient to answer the question with "Yes" or "No".
b.)	If the firewall blocks the conference software and does not "automatically inquire" as described under item a. and/or the firewall has been individually configured by the user, the abovementioned information (IP-address and port) must simply be taken into consideration. These settings can normally be accomplished with a few clicks.
c.)	If the two possibilities listed above do not work, the users can also deactivate their firewalls for the duration of the conference.
d.)	If the computer is integrated into a (company) network, please inform the network administrator with sufficient time before your conference, so that the firewall can be set up accordingly, if necessary. An experienced administrator can usually make these adjustments quickly.