At certain point, my testcontainers tests stopped working. First, I got the
NullPointerException in the
withNetworkMode method. Later, the could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network error.
For a while I suspected, that this might somehow be linked to a new OpenVPN connection, that I started using.
Anyway, this was solved by
docker network prune