HTTA-813 — Authentication form incorrectly filled/sent
The authentication proxy received an authentication form from a client, but parsing it failed. Named field was expected, but has not been found or has not been found in a proper place in the POST data.
It can be either an error of the client, or the form page prepared on the firewall and sent to the client was incorrect. First, consult proper manual page and see whether the page is correct. Then, check the data sent by the client.
Authentication proccess will fail.