Cannot connect to Tiller

I am trying to upgrade cert-manager in a cluster we have on our Gitlab instance. Cert-manager and Tiller itself were installed using gitlab interface.

There is new version for sure, but Applications section in the cluster page, doesn’t show any upgrade buttons. Also trying to manually connect to the Tiller instance is impossible :

 ∴ helm version --tiller-namespace gitlab-managed-apps --debug
Client: &version.Version{SemVer:"v2.16.1", GitCommit:"bbdfe5e7803a12bbdf97e94cd847859890cf4050", GitTreeState:"clean"}
[debug] Created tunnel using local port: '32785'

[debug] SERVER: ""

Kubernetes: &version.Info{Major:"1", Minor:"13+", GitVersion:"v1.13.12-eks-c500e1", GitCommit:"c500e11584c323151d6ab17526d1ed7461e45b0c", GitTreeState:"clean", BuildDate:"2019-10-22T03:11:52Z", GoVersion:"go1.11.13", Compiler:"gc", Platform:"linux/amd64"}
[debug] context deadline exceeded
Error: cannot connect to Tiller

Any suggestions what to do. There are no problems connecting to the cluster itself, kubectl works as intended.

What worked in the end is this : Orphaned apps in gitlab-managed-apps namespace

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