Troubleshooting
Problem
You are experiencing LDAP performance issues and getting random CWWIM4520E error messages at WebSphere systemout.log
Symptom
When you check the WebSphere systemout.log, you can see any of the following error messages.
CWWIM4520E The 'javax.naming.NamingException: LDAP response read timed out, timeout used:20000ms"
CWWIM4520E The 'javax.naming.CommunicationException: ldap.ibm.com:389 [Root exception is java.net.ConnectException: Connection refused: connect]' naming exception occurred during processing.
CWWIM4520E The 'javax.naming.CommunicationException: ldap.ibm.com:636 [Root exception is java.net.SocketException: Connection reset]' naming exception occurred during processing.
Document Location
Worldwide
[{"Type":"MASTER","Line of Business":{"code":"LOB77","label":"Automation Platform"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"ARM Category":[{"code":"a8m50000000CdYPAA0","label":"WebSphere Application Server traditional-All Platforms-\u003ESecurity-\u003EUser Registry-\u003ELDAP-\u003EFederated Repositories"}],"ARM Case Number":"","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions"}]
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Document Information
Modified date:
13 May 2025
UID
ibm16536670