APAR status
Closed as program error.
Error description
When Integrated Windows Authentication is enabled, it is possible that a request message can return more than one challenge type (NTLM, Negotiate, NEGO2, etc.), depending on your configuration. If multiple are configured, they are being returned as a comma separated list like: WWW-Authenticate: Negotiate, NTLM While this is acceptable by the standards, some clients may not correctly parse the combined header, believing both challenges to be a single challenge that is malformed.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: All users of IBM App Connect Enterprise V11 who uses Integrated Windows Authentication. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: When Integrated Windows Authentication (IWA) is enabled, the server(ACE) can return more than one challenge through WWW-Authenticate header such as NTLM, Negotiate, NEGO2, etc. depending on the configuration. They are being returned as a comma-separated list like below : WWW-Authenticate: Negotiate, NTLM. Though this format is acceptable as per standards, some clients may fail to parse the combined header. Clients may expect multiple <span style="background-color:rgb(255, 255, 255)">WWW-Authenticate headers when there are more than one values like below </span> <span style="background-color:rgb(255, 255, 255)">WWW-Authenticate: Negotiate WWW-Authenticate: NTLM.</span>
Problem conclusion
The product is fixed to avoid using comma-separated values in <span style="background-color:rgb(255, 255, 255)">WWW-Authenticate header. Instead for each value, a new header is created.</span> --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v11.0 11.0.0.14 v12.0 12.0.2.0 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
IT37694
Reported component name
APP CONNECT ENT
Reported component ID
5724J0550
Reported release
B00
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2021-07-20
Closed date
2021-09-09
Last modified date
2021-10-06
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
5724J0550
Applicable component levels
[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSDR5J","label":"IBM App Connect Enterprise"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"B00"}]
Document Information
Modified date:
13 October 2021