Rancher-webhook failed calling webhook remote error: tls: unrecognized name

Hi,
i have rancher installed on docker (mono node mode).
I import a new cluster EKS and try to create a namespace from Rancher dashboard, but i receive this error:

Internal error occurred: failed calling webhook “rancher.cattle.io.clusters.provisioning.cattle.io”: failed to call webhook: Post “https://rancher-webhook.cattle-system.svc:443/v1/webhook/mutation/clusters.provisioning.cattle.io?timeout=10s”: remote error: tls: unrecognized name

I didn’t find topic about, someone know which could be the problem?

Thanks
Cristian