Error fetching openid configuration: 502 Bad Gateway

Hi,

I get an error when running the server behind NGINX. NSS and NGINX are running on two different machines.

I do solid start with the following config:

{
  "root": "/users/pheyvaer/nss/data",
  "port": "8443",
  "serverUri": "https://dev.inclusie-in-4d.ilabt.imec.be",
  "webid": true,
  "mount": "",
  "configPath": "./config",
  "configFile": "./config.json",
  "dbPath": "",
  "sslKey": "privkey.pem",
  "sslCert": "fullchain.pem",
  "multiuser": true,
  "enforceToc": false,
  "disablePasswordChecks": false,
  "supportEmail": "pieter.heyvaert@ugent.be",
  "server": {
    "name": "Inclusie in 4D",
    "description": "",
    "logo": ""
  }
}

I get this error

Error registering a new client:  Error: Error fetching openid configuration: 502 Bad Gateway
    at /users/pheyvaer/.nvm/versions/node/v12.19.0/lib/node_modules/solid-server/node_modules/@solid/oidc-rp/src/onHttpError.js:32:17
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  response: Response {
    size: 0,
    timeout: 0,
    [Symbol(Body internals)]: { body: [PassThrough], disturbed: false, error: null },
    [Symbol(Response internals)]: {
      url: 'https://dev.inclusie-in-4d.ilabt.imec.be/.well-known/openid-configuration',
      status: 502,
      statusText: 'Bad Gateway',
      headers: [Headers],
      counter: 0
    }
  },
  statusCode: 502
}

A wildcard certificate is implemented for the *.dev.inclusie-in-4d.ilabt.imec.be. I'm also wondering where the .well-known/openid-configuration is coming from. Is it something that is provided by NSS?

Start with the failing request to /.well-known/openid-configuration and the stack entry at node_modules/@solid/oidc-rp/src/onHttpError.js, then trace how NSS and NGINX route it between the two machines. Done means identifying the source of the 502 and documenting or correcting the relevant server or proxy configuration.