The platform is up, but one dependency path is not.

Use this when cluster services stay online and memory-copy traffic or delegated auth breaks during migration operations. These issues are easy to misread because the operating system still responds while one control path, runtime dependency, or trust assumption is already out of alignment.

The symptom usually appears downstream from the real change.

• Failover Cluster assumptions are often changed indirectly by updates, policy, hardware changes, or cleanup work that looked harmless at the time.
• Live Migration assumptions are often changed indirectly by updates, policy, hardware changes, or cleanup work that looked harmless at the time.
• Kerberos assumptions are often changed indirectly by updates, policy, hardware changes, or cleanup work that looked harmless at the time.
• Windows Server assumptions are often changed indirectly by updates, policy, hardware changes, or cleanup work that looked harmless at the time.