question Re: Unable to register Impalad: Caused by: KrbException: Identifier doesn't match expected value in Support Questions

Unable to register Impalad: Caused by: KrbException: Identifier doesn't match expected value

Yasine — Tue, 21 Apr 2026 06:49:39 GMT

Hello,

We are facing issues regarding KDC, on CDP HBase and Impalad wont start and here below the logs:

The Keytab file is generating kerberos ticket correctly (using the command line kinit) and the service Keytabs have been regenerated several times but still the same issue.

This issue is blocking: Impala, HBase and Yarn Nodemanagers

Caused by: KrbException: Server not found in Kerberos database (7) - LOOKING_UP_SERVER
at sun.security.krb5.KrbTgsRep.<init>(KrbTgsRep.java:73)
at sun.security.krb5.KrbTgsReq.getReply(KrbTgsReq.java:226)
at sun.security.krb5.KrbTgsReq.sendAndGetCreds(KrbTgsReq.java:237)
at sun.security.krb5.internal.CredentialsUtil.serviceCredsSingle(CredentialsUtil.java:477)
at sun.security.krb5.internal.CredentialsUtil.serviceCreds(CredentialsUtil.java:340)
at sun.security.krb5.internal.CredentialsUtil.serviceCreds(CredentialsUtil.java:314)
at sun.security.krb5.internal.CredentialsUtil.acquireServiceCreds(CredentialsUtil.java:169)
at sun.security.krb5.Credentials.acquireServiceCreds(Credentials.java:490)
at sun.security.jgss.krb5.Krb5Context.initSecContext(Krb5Context.java:695)
... 36 more
Caused by: KrbException: Identifier doesn't match expected value (906)
at sun.security.krb5.internal.KDCRep.init(KDCRep.java:140)
at sun.security.krb5.internal.TGSRep.init(TGSRep.java:65)
at sun.security.krb5.internal.TGSRep.<init>(TGSRep.java:60)
at sun.security.krb5.KrbTgsRep.<init>(KrbTgsRep.java:55)

Re: Unable to register Impalad: Caused by: KrbException: Identifier doesn't match expected value

rki_ — Thu, 24 Aug 2023 11:57:06 GMT

Did you make any changes at the KDC end prior to seeing this issue? Are there any other services hosted on this node that are working fine?

Re: Unable to register Impalad: Caused by: KrbException: Identifier doesn't match expected value

ChethanYM — Wed, 30 Aug 2023 13:03:42 GMT

Hi,

The error message you provided, "Server not found in Kerberos database (7) - LOOKING_UP_SERVER," is indicating an issue with the Kerberos authentication process. This error usually occurs when the Kerberos client is unable to find the server's principal in the Kerberos database.

Below is the article to troubleshoot kerberos related issues:

https://community.cloudera.com/t5/Customer/Troubleshooting-Kerberos-Related-Issues-Common-Errors-and/ta-p/76192

> Please check if Ensure that DNS is correctly configured for both the client and the server. The client should be able to resolve the hostname of the server to the correct IP address.

> Make sure the clocks of the client, server, and KDC are synchronized. Time differences beyond the tolerance set in Kerberos configuration can cause authentication failures.

> Ensure that the Key Distribution Center (KDC) is reachable and operational.

> Verify that the krb5.conf file on the client machine is correctly configured with the appropriate realms, KDCs, and other Kerberos settings.

Regards,

Chethan YM

Re: Unable to register Impalad: Caused by: KrbException: Identifier doesn't match expected value

Yasine — Thu, 31 Aug 2023 16:10:14 GMT

Hi Chethan

Well yes actually the issue was related to the DNS, actually the DNS was correctly configured and it was resolving the hostname but it seems that the reverse resolution was not working and it was blocking point.

When I declared the hostnames in the /etc/hosts it worked normally.

Regards

Re: Unable to register Impalad: Caused by: KrbException: Identifier doesn't match expected value

VidyaSargur — Fri, 01 Sep 2023 04:52:48 GMT

@Yasine, I'm happy to see you resolved your issue. Please mark the appropriate reply as the solution, as it will make it easier for others to find the answer in the future.