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1973518 - Error 1621 Type '#' not allowed before login - SAP ASE

Symptom

  • ASE errorlog gets clogged with numerous 'error 1621' entries
  • Type value can vary:
    Error: 1621, Severity: 18, State: 1
    Type '#' not allowed before login.
  • Applications or users may experience invalid login attempts.
  • Specifically, the following error may be seen often in the ASE log.
    Error: 1621, Severity: 18, State: 1
    Type '12' not allowed before login.


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Environment

SAP Adaptive Server Enterprise (ASE) All versions and platforms

Product

SAP Adaptive Server Enterprise 12.5 ; SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 16.0

Keywords

TDS packets, Tabular Data Stream,  TDS_LOGIN, TDS_ECHO , "type 10" , "type 1" , "message 1621", "type '1'" , "type '10'", port number, client application, database driver, "type '12'" , "Type '12' not allowed before login" , 1621, non-tds , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , How To

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