What does Windows error code 69 (ERROR_TOO_MANY_SESS) mean?

 
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ERROR_TOO_MANY_NAMES ERROR_SHARING_PAUSED

ERROR_TOO_MANY_SESS

RFC 1001 separates the NetBIOS session service from name and datagram services. The session service creates logical connections between named endpoints, so its implementation limit is a different resource from the number of registered names or outstanding commands.

This error is most useful when interpreted in the context of the component that returned it. Count active and half-closed legacy sessions and determine whether session teardown is completing. A modern SMB server session limit may surface through other codes such as ERROR_REMOTE_SESSION_LIMIT_EXCEEDED; do not merge the two merely because both mention sessions.

Session-limit diagnosis

  • Identify whether the failing stack is actually using NetBIOS session service.
  • Count active sessions and inspect whether failed peers leave session state behind.
  • Compare the failure threshold with the implementation configuration or documented limit.
  • Trace session close/abort behavior before increasing capacity.

RFC 1001 NetBIOS concepts and methods · RFC 1002 NetBIOS detailed specification · Samba smbclient manual


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