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ERROR_REQ_NOT_ACCEP
This result is a server admission limit. It is not equivalent to ERROR_CONNECTION_REFUSED, where the remote endpoint actively refuses a connection, and it is not the per-account concurrency condition described by ERROR_CONNECTION_COUNT_LIMIT. The scope of the limit matters when deciding what to measure.
Inspect the server-wide connection/session population and how quickly connections are released. A leak or long-lived idle session can consume admission capacity even when request throughput is low. On SMB systems, collect server connection and session information together with the application connection pattern.
Measure the limit scope
- Count total accepted connections or sessions on the remote computer.
- Compare failures across different user accounts; a server-wide limit should not follow only one account.
- Look for clients that reconnect without closing prior sessions.
- Do not treat password changes as remediation for exhausted connection capacity.
Windows network redirector architecture · MS-SMB2 network disconnect handling · Samba smbclient manual
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