Hello,
We have a High Available Portal for ArcGIS version 11.3, running on Windows 2022.
Suddenly it started asking for changing the password of the default admin account, and the IdP SAML started sending a weird message "Invalid SAML authentication request signature. Please contact your local support team".

However, when I stopped the primary node and started working with the once standby node, everything started working again. If I start again the other node and it becomes the primary, the authentication issues begin.
After removing the problematic node from the Portal, I have uninstalled and installed it again. Joined again the existing Portal and the problem started again.
Has anyone faced this problem? Any help would be much appreciated.
Thank you!
Kind regards,
Felipe
.