Try this:

​@spider32  try iis reset 

Some things to check as it could be one of them -

🛠️ Common Causes of “Server Error” in Veeam EM Self‑Service Portal

1. Application Pool Stopped or Crashed

This is the number one cause.

What to check

• Open IIS Manager

• Go to Application Pools

• Look for:

  • VeeamBackup

  • VeeamBackupREST

  • VeeamBackupReporting

  • VeeamBackupPortal (Self‑Service Portal)

What to do

• Ensure the pool is Started

• If it stops immediately:

  • Check the Identity → often a password change breaks it

  • Re‑enter the service account password if needed

  • Confirm the account has Log on as a service rights

2. .NET CLR Version Mismatch

Veeam EM requires specific .NET versions depending on your VBR/EM version.

Symptoms

• Portal loads with a generic “Server Error”

• Application pool crashes on startup

Fix

• Ensure the pool is set to the correct .NET CLR version

• Ensure ASP.NET features are installed in Windows Server Roles

3. Bindings or HTTPS Certificate Issues

If the SSL certificate expired or was replaced, the portal may fail to load.

Check

• IIS → Sites → VeeamBackup

• Review HTTPS bindings

• Ensure the certificate is valid and assigned

4. Veeam Enterprise Manager Services Not Running

The portal depends on several backend services.

Ensure these are running:

• Veeam Backup Enterprise Manager

• Veeam RESTful API Service

• Veeam Backup Service

• Veeam Broker Service

Restarting them in order often resolves transient issues.

5. Database Connectivity Problems

If EM cannot reach its SQL database, the portal throws a server error.

Check

• SQL Server is online

• EM server can reach SQL over the network

• SQL credentials used by EM are still valid

Thanks for the replies. I can login to Enterprise Manager just not on the /Backup site.

IIS is up and running, application pools are running, DB connectivity is good. I have restarted the application pools and IIS, still get the error.

Is the SSL good in IIS?  When you access the VEM dashboard what shows for the SSL connection?  Not sure what else to suggest other than a quick uninstall and reinstall just pointing it back to the same DB again - that tends to resolve all things.