3637851 - Two identical failed login entries in ASE error log with connect with invalid user - SAP ASE

• 'log audit logon failure' is enabled.
• Login with invalid login to ASE via isql client (16.0.4.4 and later), two identical failed login entries in the ASE server error log file at the exact same timestamp for single login attempt.

00:0002:00000:00033:2025/07/25 01:58:16.54 Logon  Login failed : User INVALID LOGIN, Client IP address: '10.180.0.44', Appname: isql, Progname: CT-Library, Progversion: 16.0.4.4, TdsVersion:5.0.0.0.
00:0002:00000:00034:2025/07/25 01:58:16.54 Logon  Login failed : User INVALID LOGIN, Client IP address: '10.180.0.44', Appname: isql, Progname: CT-Library, Progversion: 16.0.4.4, TdsVersion:5.0.0.0.

•  Login with invalid user via ODBC, duplicate failed login entries like below are generated in ASE error for single login attempt.

00:0006:00000:00039:2025/07/29 21:24:42.11 Logon  Login failed : User INVALID LOGIN, Client IP address: '10.128.138.213', Appname: odbcad32.exe, Progname: ODBC, Progversion: 16.0.4.1, TdsVersion:5.0.0.0.
00:0006:00000:00040:2025/07/29 21:24:50.85 Logon  Login failed : User INVALID LOGIN, Client IP address: '10.128.138.213', Appname: odbcad32.exe, Progname: ODBC, Progversion: 16.0.4.1, TdsVersion:5.0.0.0.

•  There is only a single entry with ASE 16.04.03.

• SAP Adaptive Server Enterprise (ASE) 16.0
• SAP Software Development Kit (SDK)
  • ODBC
  • Open Client (ctlib)

KBA , BC-SYB-SDK , SDK , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , Problem