I know this post is EXTREMELY old but the response from Support wasn't exactly helpful for the question posed & had zero luck finding the answer searching, so figured I'd comment with an actual fix for being locked out of Syncrify due to too many unsuccessful login attempts. Syncrify uses standard Fail2Ban so you can view banned IP's with:
iptables -L
which gives something along the lines of:
Chain f2b-syncrify (1 references)
target prot opt source destination
REJECT all -- 192.168.1.87 anywhere reject-with icmp-port-unreachable
RETURN all -- anywhere anywhere
That line with the 192 IP address is what's blocking you. To remove the ban you do:
iptables -D f2b-syncrify -s 192.168.1.87 -j REJECT
If no error you can check the list again to verify it's actually gone.
(Note: If not logged in as root you can use sudo in front of it.)
If you are curious you can view the config in the syncrify sections at /etc/fail2ban/jail.local
it appears you are banned for an hour for 1 hour for 3 bad login attempts within 1 hour span. So you could just wait an hour instead of manually clearing the ban but obviously that's far from ideal in many circumstances.
I hope this proves helpful to someone.
Bill