Rejected Share is a general term for a result submitted by a miner but not accepted by the pool. Depending on the system, the reason can be an outdated job, computational error, duplicate result, protocol error, or another violation of the pool’s validation requirements.

Rejected share therefore describes the processing outcome rather than one specific cause.

Common Rejection Reasons

Problem Type What Happened
Stale Share The result belongs to an outdated job.
Invalid Share The result fails correctness requirements.
Duplicate The pool has already received the same result.
Protocol error The result does not match the expected format or connection state.

Rejected Shares and Mining Efficiency

A small percentage of rejected results can occur during normal operation because of network latency and job-processing characteristics. A persistently high rejection rate, however, requires investigation.

The cause of rejection should be identified before troubleshooting. If stale shares dominate, attention should be given to network latency and connectivity. If invalid shares dominate, hardware stability, configuration, temperature, and software should be checked.