Login is no longer possible after updating the HIN Mailgateway from version 14.1.4.2 to 15.0.5 (affects only systems in a cluster)

Fault Symptoms

After updating to version 15.0.5, it is still possible to log in to the appliance for a few minutes. After about 10 minutes, login attempts fail on both cluster members. The error pattern suggests that cluster replication is causing the problems. According to the manufacturer, this is a known issue.

Solution

1. Restore snapshots from both cluster members simultaneously

2. A cluster member must remain shut down after the restore

3. Dissolve the cluster (download the cluster identifier first)

4. The system boots up immediately and without warning!

   

5. Update System 1

6. Shut down System 1

7. Repeat the same game using System 2

Sources

1. SEPPmail Documentation – “Cluster / High Availability” — Cluster types and configuration replication across all nodes.

2. SEPPmail Documentation – “Administration” — Update order within the cluster (frontend before backend) and the requirement for identical version numbers.

3. HIN Mailgateway: Backup & Disaster Recovery im Cluster — An in-depth look at cluster replication, backup, and restore.