Which URLs should I whitelist on the firewall to enable OpenID Connect on Proxmox?

[sehranrasooljan]

I’m trying to integrate OpenID Connect (OIDC) on my Proxmox server using Microsoft Entra ID (Azure AD). However, by default, internet access is blocked on the Proxmox host via the firewall.
To allow OIDC to work properly, which specific URLs or domains should I whitelist to enable authentication and token verification without exposing full internet access?

Any help would be appreciated. Thanks!

 

[gmaceu]

Try to allow traffic to the login.microsoftonline.com subdomain.