Thanks!
Removing localhost
from trusted_domains
and appending a port on the remaining elements as shown below made the error go away for me also.
# grep -A 5 -i trusted_domains config/config.php
'trusted_domains' =>
array (
0 => 'example.com:443',
),
);
Maybe something to do with how my proxy setup handles stuff on port 80?
Looking at the docs, it doesn’t seem like having a stricter setting here should be a problem, so long as you can still access your instance OK.
https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/config_sample_php_parameters.html#trusted-domains
It’d be nice to see some clearer guidance about this issue in the update issues thread though - it took me way too long to convince myself that everything was OK with my instance and figure out how to address the problem.