Synology DiskStation User Manual page 66

To enable auto block:
1 Tick
2 Enter the following information to block an IP address with a number of failed login attempts within the
specified minutes :

Login

Within
3 Tick
unblock the IP address after the specified days.
Note:
4 Tick
notification is enabled for your Synology DiskStation before using this option.
Note:
To manage the blocked IP addresses:
1 Click
2 If you want to remove an IP address from the block list, select it and click Remove.
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Enable auto block.
attempts: The number for failed login attempts
(minutes): The number of minutes
Enable block expiration and enter a number of days in the Unblock after (days) field if you want to
The IP address will remain blocked if
Enable email notification to receive email notification when an IP address is blocked. Make sure email
For more information about email notification, see "Receive Email Notification" on Page 212.
Block List to check the blocked IP addresses.
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Unblock after (days) is set to 0.
Synology DiskStation User's Guide
Based on DSM 3.1