# Kerberos authentication does not work from the public container

**URL:** <https://forum.keycloak.org/t/kerberos-authentication-does-not-work-from-the-public-container/31159>\
**Category:** Getting advice\
**Created:** [October 28, 2025, 2:04pm UTC](https://forum.keycloak.org/t/kerberos-authentication-does-not-work-from-the-public-container/31159 "2025-10-28T14:04:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![spictera](https://avatars.discourse-cdn.com/v4/letter/s/ac91a4/32.png) [@spictera](https://forum.keycloak.org/u/spictera)\
**Post date:** [October 28, 2025, 2:04pm UTC](https://forum.keycloak.org/t/kerberos-authentication-does-not-work-from-the-public-container/31159/1 "2025-10-28T14:04:07Z")

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Hi.

We are trying to get the Kerberos authentication to accept our kerberos ticket.

The mother host seams to work with the provided keytab, where I can perform a kinit + klist.

But doing the same within the container:

FROM “[Quay](http://quay.io/keycloak/keycloak:26.2.5%E2%80%9D)

Does not work (the error is “checksum error”)

It looks like that the container does not include the necessary krb5-libs?

Anyone know how to resolve this?

Regards Tomas

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/keycloak/original/1X/eb342909d95cf32cbb7517610022c6a0046a9ffb.png) [@system](https://forum.keycloak.org/u/system)\
**Post date:** [April 26, 2026, 2:05pm UTC](https://forum.keycloak.org/t/kerberos-authentication-does-not-work-from-the-public-container/31159/2 "2026-04-26T14:05:03Z")

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