HRESULT 0x80280905 (TPM_20_E_SESSION

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All loaded TPM session handles are in use and a session must be flushed.

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TPM_20_E_MEMORY	TPM_20_E_OBJECT_HANDLES

TPM_20_E_SESSION_HANDLES

No new session handle can be allocated

TPM_20_E_SESSION_HANDLES wraps TPM_RC_SESSION_HANDLES. The TPM has a bounded set of handles for loaded sessions. Unlike a session-memory warning, this response specifically states that no session handle is available and directs software to flush a session before starting another one.

Sessions are stateful security objects. Discarding a handle without understanding its purpose can invalidate a policy flow, lose an audit digest, or break parameter encryption. Cleanup should target completed or abandoned sessions rather than whichever handle is easiest to remove.

Practical checks

List loaded session handles and correlate them with owning processes or TBS contexts.
Close each session after the final authorized command instead of waiting for process termination.
Keep long multi-command policy sessions on a connection that the resource manager can preserve.
After abnormal termination, verify that the resource manager has reclaimed the client's virtual resources.

References

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