Jens,

You can allow this by updating the kibana.yml file.
(default location c:\Program Files\Elasticsearch\Kibana\config)

The server.host configuration specifies the address to which the Kibana server will bind. IP addresses and hostnames are both valid values.

The default is 'localhost', which usually means remote machines will not be able to connect. To allow connections from remote users, set this parameter to a non-loopback address.