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From: xiansheng lao [mailto:xiansheng....@icloud.com.INVALID] 
Sent: 01 August 2023 08:21
To: users@kafka.apache.org
Subject: Kafka User Authentication Exception

 

Dear Kafka Community Team, 

 

I am a developer who is facing an issue while attempting to use SASL 
authentication with Kafka. I have tried various methods to troubleshoot the 
problem, but have not yet found a solution. Therefore, I am reaching out to 
seek your help and guidance.

 

Issue Description:

I am trying to connect to Kafka from my client application using the SASL 
authentication mechanism. In my client code, I have implemented the 
`SaslClientCallbackHandler` class to handle callbacks and provided the correct 
credentials (username and password). However, during the connection process, I 
encounter the "javax.security.sasl.SaslException: User name could not be 
obtained" error.

 

I have attempted the following steps to troubleshoot the issue:

1. Ensured that the client and Kafka Broker are using the same version of Kafka 
to avoid version compatibility issues.

2. Checked the SASL configuration to ensure that both the client and Kafka 
Broker are configured correctly with the same SASL mechanism and authentication 
parameters.

3. Examined the exception stack trace and logs, but couldn't find additional 
information regarding the root cause of the error.

4. Verified that the credentials are in the correct format and can be parsed 
correctly by the client.

5. Ensured that the network connection is stable and that the client can 
establish a connection with the Kafka Broker.

 

However, despite trying these approaches, the problem persists, and I am 
puzzled by the specific reasons behind the "User name could not be obtained" 
error.

 

In this situation, I am seeking your advice on whether there might be other 
reasons causing this error and how I can further investigate and resolve this 
issue. Any suggestions, hints, or relevant documentation would be greatly 
appreciated.

 

I am sincerely grateful for your contributions and support to the Kafka 
community and look forward to your assistance in resolving this authentication 
issue, so I can continue with my project development using Kafka.

 

Thank you for your time and patience!

 

We are using Kafka version 1.1.1 with SCRAM-PLAIN authentication mechanism, and 
we have encountered an authentication exception. Below are the detailed error 
logs. Thank you for your assistance.

 

Best regards,

[elderly gentleman]

 

2027-10-01 13:52:09,879 kafka-producer-network-thread TEST] ERROR [] 

Producer clientId-TEST] Connection to node -1 failed authentication due to: An 
error:

(java.security.PrivilegedActionException:javax.security.sasl.SaslException: 
User name could not be obtained Caused by 
javax.security.auth.callback.UnsupportedcallbackException:Unrecognized SASL 
ClientCallback)

occurred when evaluating SASL token received from the Kafka Broker.Kafka Client 
will go to AUTHENTICATION FAILED state.

 

 



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