APAR status
Closed as program error.
Error description
During load testing, where requests randomly alternate between Kerberos and NTLM authentication against an IWAconfigured listener, some requests intermittently fail. This issue cannot be reproduced when service trace is enabled because the additional overhead slows processing enough for the authentication sequences to complete before the session times out.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: All Users of IBM App Connect Enterprise v12 and v13 using IWA authentication. Platforms affected: WinX64 **************************************************************** PROBLEM DESCRIPTION: Intermittent authentication failures occur during load testing when requests rapidly alternate between Kerberos and NTLM against an IBM App Connect Enterprise listener configured for SPNEGObased IWA authentication. This issue cannot be captured when service trace is enabled.
Problem conclusion
The product has been modified and the intermittent authentication failure issue is resolved. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v12.0 12.0.12.24 v13.0 13.0.7.0 The latest available maintenance can be obtained from: http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041 If the maintenance level is not yet available,information on its planned availability can be found on: http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IT49049
Reported component name
APP CONNECT ENT
Reported component ID
5724J0560
Reported release
C00
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2026-02-10
Closed date
2026-02-27
Last modified date
2026-02-27
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
APP CONNECT ENT
Fixed component ID
5724J0560
Applicable component levels
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSDR5J","label":"IBM App Connect Enterprise"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"C00","Line of Business":{"code":"LOB77","label":"Automation Platform"}}]
Document Information
Modified date:
27 February 2026