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MF_E_PE_SESSIONS_MAXED
MF_E_PE_SESSIONS_MAXED is a protected-environment resource/lifecycle error. It means another PE session cannot be supported at that time, so the first question is how many protected sessions or PMP hosts the application and related processes still retain.
Audit protected-session ownership
- Log every successful PMP Media Session creation and the corresponding
Shutdown/release path. - Check error paths that keep a session, host, or protection object alive after playback setup fails.
- Include helper processes and repeated player instances in the count; protected processing can occur outside the main application process.
Do not respond by creating sessions in a faster retry loop. That can make the lifecycle problem worse. Microsoft documents PMP server/session objects and process isolation as explicit parts of the protected path. Reuse a supported shared PMP server where the application architecture intentionally does so, and release failed sessions deterministically before starting another protected presentation.
Microsoft: PMP Media Session and shared PMP process · Microsoft: MFCreatePMPMediaSession · Microsoft: Protected Media Path architecture
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