I’m wondering how to block empty user agents, which is a source of many of DDoS attacks to my server.
While adding new rule
User Agent Blocking rule in Firewall tools, leave the field blank, I get this error:
firewalluablock.api.unknown_error (Code: undefined)
So I appreciate if you specify how to define the rule. Should I use
"" or a regexp like
^$ or something else?