HRESULT 0x80280903 (TPM_20_E_SESSION_MEMORY): meaning and diagnosis

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The TPM lacks protected working memory for another authorization session.

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TPM_20_E_OBJECT_MEMORY	TPM_20_E_MEMORY

TPM_20_E_SESSION_MEMORY

Session memory and session handles are separate limits

TPM_20_E_SESSION_MEMORY is the Windows mapping of TPM_RC_SESSION_MEMORY. HMAC, policy, trial, and audit sessions consume TPM-resident state such as nonces, digests, attributes, and optional parameter-encryption keys. The TPM can run out of memory for that state before exhausting the numeric session-handle space.

This distinction separates it from TPM_20_E_SESSION_HANDLES. An application should first release sessions it owns, not reboot the system or delete keys. Resource managers may swap sessions, but exported session contexts also have lifetime and context-gap constraints.

Corrective actions

Flush completed policy, HMAC, trial, and audit sessions explicitly.
Do not create a new trial session for each policy command when a single session can be reused safely.
Check whether abandoned client processes left TBS contexts open.
Measure concurrent session demand and use the TPM capability data rather than assuming a fixed number of slots.

References

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