TIB Custom provider configuration - help

Support Installation and Deployment
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My TIB is not a docker container. I just follow the setup tutorial and start ./tib in my EC2 linux prompt.
My custom provider is running inside a container but as you say earlier, you succeed in calling it.

Here the content of my tib.conf (just in case) :

"Secret": "test-secret",
"HttpServerOptions": {
    "UseSSL": false,
    "CertFile": "./certs/server.pem",
    "KeyFile": "./certs/server.key"
},
    "BackEnd": {
            "Name": "in_memory",
    "ProfileBackendSettings": {},
            "IdentityBackendSettings": {
        "Hosts" : {
            "localhost": "6379"
        },
        "Password": "",
        "Database": 0,
        "EnableCluster": false,
        "MaxIdle": 1000,
        "MaxActive": 2000
    }
    },
    "TykAPISettings": {
    "GatewayConfig": {
        "Endpoint": "http://localhost",
        "Port": "8080",
        "AdminSecret": "54321"
    },
    "DashboardConfig": {
        "Endpoint": "http://localhost",
        "Port": "3000",
        "AdminSecret": "12345"
    }
}

}

And I also tried to curl my custom provider from the TIB EC2 VM

curl -X POST http://54.194.61.205:8888/auth

And it works fine relying : {“user_name”:“toto”} (http 200)