ACME LE dns challenge selectelv2 provider not working with traefik 3.5.1

[unixzen]

hello!

Can you give advice i got selectelv2 dns challenge provider at traefik 3.5.1 version and got error

2025-10-16T13:23:52+03:00 ERR Error renewing certificate from LE: {domain [*.domain]} error="error: one or more domains had a problem:\n[*.domain] [*.domain] acme: error presenting token: selectelv2: authorize: new VPC client: validation error: some of the required options are not set: DomainName, AuthURL, AuthRegion\n[domain] [domain] acme: error presenting token: selectelv2: authorize: new VPC client: validation error: some of the required options are not set: DomainName, AuthURL, AuthRegion\n" acmeCA=https://acme-v02.api.letsencrypt.org/directory providerName=leresolver.acme

error: one or more domains had a problem:
[*.domain] [*.domain] acme: error presenting token: selectelv2: authorize: new VPC client: validation error: some of the required options are not set: DomainName, AuthURL, AuthRegion
[domain] [domain] acme: error presenting token: selectelv2: authorize: new VPC client: validation error: some of the required options are not set: DomainName, AuthURL, AuthRegion

I set all possible environment variables according doc of lego https://go-acme.github.io/lego/dns/selectelv2/

SELECTELV2_PASSWORD=passw
SELECTELV2_DOMAIN_NAME=account_id
SELECTELV2_ACCOUNT_ID=account_id
SELECTELV2_AUTH_URL=https://cloud.api.selcloud.ru/identity/v3/
SELECTELV2_USERNAME=user_name
SELECTELV2_USER_DOMAIN_NAME=account_id
SELECTELV2_PROJECT_ID=project_id

At traefik lego version

go.mod v4.25.2

At traefik i have 2 wildcard domain with dns challenge and i got same issue with both domains.
I can't understand where i wrong at configuration or maybe this bug at lego or traefik. Can you help with this problem, appreciate with any help?

[ldez]

The problem is related to your env vars: they are not defined.

I don't know exactly how to set up the env vars, but it seems wrong.

[unixzen]

The problem is related to your env vars: they are not defined.

I don't know exactly how to set up the env vars, but it seems wrong.

i using selectel dns challlenge from starting when selectel appear at lego and traefik. And during many years this work.
Before update traefik till 3.5.1 i have this environment variables and all working. I saw that lets encrypt certificates not automatic update by traefik

SELECTELV2_ACCOUNT_ID: "account_id"                                                                                                                                                                              
SELECTELV2_PASSWORD: "pass"                                                                                                                                                    
SELECTELV2_PROJECT_ID: "project_id"                                                                                                                                                   
SELECTELV2_USERNAME: "user_name"

After upgrade traefik i add at the same place other new environment variables accoding docs https://go-acme.github.io/lego/dns/selectelv2/

output of env vars from container

root@gate-a:~# docker exec -ti traefik-7b80f6f0-c418 sh
/ # env | grep -i selectel
SELECTELV2_AUTH_REGION=ru-1
SELECTELV2_PASSWORD=pass
SELECTELV2_DOMAIN_NAME=account_id
SELECTELV2_ACCOUNT_ID=account_id
SELECTELV2_AUTH_URL=https://cloud.api.selcloud.ru/identity/v3/
SELECTELV2_USERNAME=user_name
SELECTELV2_USER_DOMAIN_NAME=account_id 
SELECTELV2_PROJECT_ID=project_id

but i got same error.

part traefik.yml for configuration resolver

certificatesResolvers:
  leresolver:
    acme:
      dnsChallenge:
        delayBeforeCheck: 60
        provider: selectelv2
        resolvers:
        - 1.1.1.1:53
        - 8.8.8.8:53
      email: user@domain
      storage: /certs/acme-dns.json

[ldez]

Is it working with Traefik v3.5.0?

[ldez]

You are using a non-existing env var SELECTELV2_DOMAIN_NAME.

The right name is SELECTELV2_USER_DOMAIN_NAME

[ldez]

OK, I think I found the problem: Traefik is using v4.25.2 instead of v4.26.0.

https://github.com/go-acme/lego/blob/master/CHANGELOG.md#v4260-2025-09-13
#2638

Note, I already updated Traefik to v4.26, but the Traefik maintainers didn't create a Traefik version with it.

[unixzen]

Ok i will check it and reply at this thread. Thanks a lot!

[unixzen]

OK, I think I found the problem: Traefik is using v4.25.2 instead of v4.26.0.

https://github.com/go-acme/lego/blob/master/CHANGELOG.md#v4260-2025-09-13 #2638

Note, I already updated Traefik to v4.26, but the Traefik maintainers didn't create a Traefik version with it.

Hello, @ldez

I checked and all works fine. Thanks a lot!