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SCARD_E_SERVER_TOO_BUSY
SCARD_E_SERVER_TOO_BUSY The Smart Card Resource Manager was too busy to complete the operation. This can be transient, but it is a signal to avoid uncontrolled parallel retries and excessively long card transactions.
How to respond
- Use bounded retry with backoff and retain the original operation context for diagnostics.
- Ensure that each client ends transactions promptly and does not hold an exclusive connection while idle.
- Check Smart Card service events and resource pressure if the problem appears across readers or applications.
Microsoft: Smart Cards for Windows service
Microsoft: SCardEstablishContext
Microsoft: SCardBeginTransaction
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