Environment
Advanced Authentication
Advanced Authentication - SaaS
AA 6.3.4
AA SaaS 21.4.1
Situation
Error "WebAuth feature is not running"
Error occurs for users who belongs to lots of AD groups or to AD groups with really long names.
Nginx error log shows the error: upstream sent too big header while reading response header from upstream
Resolution
For on-prem Advanced Authentication apply AA6.3.4 patch 1.
Bug has been entered for Advanced Authentication - SaaS