3251601 - Error 1601 audit queue full AUDIT PROCESS EXCEPTION

• ASE runs out of user connections. 
  Error: 1601, Severity: 17, State: 3
  server There are not enough 'user connections' available to start a new process. Retry when there are fewer active users, or ask your System Administrator to reconfigure ASE with more user connections.
• Following message is reported in the ASE error log some days earlier than Error 1601 reported:
  AUDIT PROCESS EXCEPTION: Can't allocate space for either syslogs or the current sysaudit table in database 'sybsecurity' because the corresponding segment is full/has no free extents. Please refer to Security Administration Guide for details.
• Extending sybsecuity database does not help. sp_helpdb shows there is free space in sybsecuity database.
• Increasing 'audit queue size' does not help. sp_monitorconfig 'audit queue size' outputs show the 'Num_free' keeps decreasing while 'Num_active' keeps increasing and finally it ends up to 0. 

• SAP Adaptive Server Enterprise (ASE) 16.0 for Business Suite
• SAP Netweaver (all versions)

1601, "user connections", "AUDIT PROCESS EXCEPTION", sybsecurity, sysaudit, "audit queue", auditing   , KBA , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem