Hi,

We are currently using SmarterMail Enterprise Build 9238 with multiple customer domains hosted. Recently, we encountered an issue where we were unable to access the webmail interface for the administrative (primary) domain, while customer domain webmail interfaces continued to function correctly.

While reviewing the IIS bindings, we attempted to make changes but encountered the attached error (screenshot omitted here). To resolve the issue temporarily, we:

1. Removed the existing SSL certificate

2. Manually uploaded a new certificate

3. Re-applied the binding

4. Restarted the IIS service

After doing so, the administrative domain webmail became accessible again.

We normally use SmarterMail’s built-in Let's Encrypt integration for SSL certificate management. It seems like there may have been a conflict or renewal issue specific to the primary domain.

Has anyone else experienced this kind of issue? Are there any known bugs or configuration steps we should review to prevent this from recurring?

Any guidance would be appreciated.