rfc2136 provider - flags not found

[vstoppe]

What happened:

I was following the Documentation for Setting up the rfc2136 provider with:

• Helm-Chart 1.2.0
• Image: latest
• DNS-Server: Microsoft DNS
• Kubernetes 1.32.12

I get errors like:

time="2026-04-14T13:21:28Z" level=fatal msg="flag parsing error: unknown long flag '--rfc2136-kerberos-username'"
msg="flag parsing error: unknown long flag '--rfc2136-kerberos-password'"
msg="flag parsing error: unknown long flag '--rfc2136-kerberos-realm'"
msg="flag parsing error: unknown long flag '--rfc2136-gss-tsig'"

These are my flag in the helm-Chart:

    extraArgs:
      - --provider=rfc2136
      - --rfc2136-host=my.dc.mydomain.com
      - --rfc2136-port=53
      - --rfc2136-tsig-axfr
      - --rfc2136-zone=mydomain.com
      - --rfc2136-kerberos-username="DOMAIN\Username"
      - --rfc2136-kerberos-password="SuPeRsEcrEtPaSs"
      - --rfc2136-kerberos-realm=mydomain.com
      - --rfc2136-gss-tsig

What you expected to happen:

I expected that the parameters would be accepted.

How to reproduce it (as minimally and precisely as possible):

Configure rfc2136 with these extraArgs.

Checklist

• I have searched existing issues and tried to find a fix myself
• I am using the latest release,
  or have checked the staging image to confirm the bug is still reproducible
• I have provided the actual process flags (not Helm values)
• I have provided kubectl get <resource> -o yaml output including status
• I have provided full external-dns debug logs
• I have described what DNS records exist and what I expected => not reached this state so far

[ivankatliarchuk]

helm chart 1.2.0 - release date is Aug 19, 2021

Not sure if those flags are there.

[vstoppe]

According To Artifacthub and the release page this was released on 2nd January 2026. And the Image should be the latest.
As soon as we manage to get the images from registry.k8s.io through the coporate web-proxy I will also try the versioned images.

[ivankatliarchuk]

According To Artifacthub and the release page this was released on 2nd January 2026. And the Image should be the latest. As soon as we manage to get the images from registry.k8s.io through the coporate web-proxy I will also try the versioned images.

1.2.0 released years back, you could check it here https://github.com/kubernetes-sigs/external-dns/tags