How can i unblock an IP (blocked through brute force detection)?

You can also use the occ client:
$ php occ security:bruteforce:reset <ip-adresse>

If you have an reverse proxy runnig you may want to add some special things to your nextcloud config.php:

 'trusted_proxies' => array('192.168.1.1'),
 'forwarded_for_headers' => array('HTTP_X_FORWARDED_FOR'),

While 192.168.1.1 is the local IP address of your reverse proxy.

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