Sheera Khan wrote:
nothing special is going on that I'd be aware of ...
Does the simulator start as usual?
Do you have a firewall active?
Did the configuration change on upgrade?
The error message indicates a problem where the grid services have stored a set of connection parameters (IP and port) that differs from the parameters used by the simulator. So maybe deleting the region via RegioManager Tool (https://metropolis.hypergrid.org/regioman.php) and restarting the simulator might help...
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 1
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