A fix is available
APAR status
Closed as program error.
Error description
Migrating from CICS v5.6 to 6.1 and now see message DFHWB1583 being issued with garbage for the new IP address. This happens when the WEB CONVERSE fails during the SEND due to network problems. The message looks like so: . +DFHWB1583I REGNNAME THE IP ADDRESS FOR HOST whatever.host.name.is HAS CHANGED. THE OLD IP ADDRESS WAS: 12.123.456.78. THE NEW IP ADDRESS IS: . Message DFHWB1583 was introduced by APAR PH63454/UI98908.
Local fix
You can stop the message from being issued by disabling the DNS cache by setting feature toggle "com.ibm.cics.web.dnscache=false". True is the default value. Keywords: KIXREVQWD
Problem summary
**************************************************************** * USERS AFFECTED: All CICS Users with PH63454 applied (PTFs * * UI98907 or UI98908, or superceding PTFs * * UI99534 or UI99535). * **************************************************************** * PROBLEM DESCRIPTION: Message DFHWB1583 may contain corrupted * * data in the New IP Address field. * **************************************************************** Message DFHWB1583, which was added by APAR PH63454, is issued to document when a DNS lookup detects that the IP address has changed from the one that was being currently used, but it may contain corrupted data in the New IP Address field. This message corruption will only occur when the connection fails.
Problem conclusion
UI98907 UI98908 UI99534 UI99535 CICS has been changed to ensure that the New IP Address is correctly picked up and set in message DFHWB1583.
Temporary fix
Comments
APAR Information
APAR number
PH66288
Reported component name
CICS TS Z/OS V6
Reported component ID
5655YA100
Reported release
400
Status
CLOSED PER
PE
YesPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2025-04-24
Closed date
2025-11-21
Last modified date
2025-11-30
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PH68736 UO05905 UO05906
Modules/Macros
DFHMEWBC DFHMEWBE DFHMEWBK DFHWBA DFHWBA1 DFHWBAP DFHWBAPF DFHWBBLI DFHWBBMS DFHWBCL DFHWBDM DFHWBDUF DFHWBENV DFHWBFM DFHWBIP DFHWBLT DFHWBPA DFHWBQM DFHWBRL DFHWBRP DFHWBSC DFHWBSO DFHWBSR DFHWBSV DFHWBTC DFHWBTCC DFHWBTRI DFHWBTTA DFHWBUE DFHWBUR DFHWBUX DFHWBXM DFHWBXN
Fix information
Fixed component name
CICS TS Z/OS V6
Fixed component ID
5655YA100
Applicable component levels
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSGMGV","label":"CICS Transaction Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1","Line of Business":{"code":"LOB70","label":"Z TPS"}}]
Document Information
Modified date:
30 November 2025