We have a customer that maintains a Barracuda X100 firewall, and they were suddenly getting “Temporarly Unavailable” when trying to access the web interface. The following article was a help getting us access to the admin console.

https://community.barracudanetworks.com/forum/index.php?/topic/29256-unable-to-access-barracuda-login-page/

After  the “/cgi-mod” in the URL we added “/index.cgi?error=3&locale=en_US&primary_tab=ADVANCED&secondary_tab=troubleshooting” ( without the quotes), and hit enter.  We could then access the admin panel.

Let us know if this helped you…