Failed login attempts to the DirectAdmin control panel several times can mark your IP under blacklist in the server. You may get a message saying “Your IP is blacklisted” when you try to access the control panel via the web browser when the IP is blacklisted in the server. You will be able to remove yourself from the black list by doing the following steps if you have the root access to the server.
To remove yourself from the blacklist, edit:
/usr/local/directadmin/data/admin/ip_blacklist
Remove your IP from the list of IPs marked in the above file. You can find your IP on the following link.
If you want to ensure you never get blacklisted, you can create and add your IP to the file:
/usr/local/directadmin/data/admin/ip_whitelist
Please note that you can add only one IP in each line.
Hope the above helped you 🙂