When making any changes to a WAF rule, form based authentications will stop working and throw an error 404. When editing the affected authentication policy and saving the settings, which reloads WAF, the problem is gone. This can be reproduced on two firewalls in my lab and it happens every time, a WAF rule has been changed and appears to be a a new problem after upgrading to SFVH (SFOS 19.5.2 MR-2-Build624) . My WAF rules are being changed every night using the API to update the certificate, this is why I can 100% confirm, that this problem has not exist in the previous SFOS.
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