I have a problem very similar to this one which has been marked as solved. I have followed the instructions which did not work.   I am trying to upload a Nifi XML template that I have previously exported, but am getting a 403. I am running Nifi version 1.17.0 in a docker container. The docker image is the latest, which should be 1.14.0 It is run using docker compose. I am using Postman to send the REST requests.   The steps I have taken are:   Generate an access token using: POST https://localhost:8443/nifi-api/access/token with an x-www.form-urlencoded body containing the username and password set in the .env file. This token is then used as the bearer token Get the root process-group id using: GET https://localhost:8443/nifi-api/flow/process-group/root then taking the id from processGroupFlow:id Failing to import an XML template using: POST https://localhost:8443/nifi-api/process-groups/{id}/templates/import where the body is raw XML, containing the previously exported template. The error I receive is: HTTP ERROR 403 Forbidden URI:STATUS:MESSAGE:SERVLET: /nifi-api/process-groups/882f73b9-0183-1000-28e5-9508657cbe9f/templates/import 403 Forbidden jerseySpring   My docker compose yaml file is: version: '2.2' services: nifi: image: apache/nifi:latest container_name: nifi ports: - ${HTTP_EXTERNAL_PORT}:${HTTP_INTERNAL_PORT} - ${HTTPS_EXTERNAL_PORT}:${HTTPS_INTERNAL_PORT} environment: - SINGLE_USER_CREDENTIALS_USERNAME=${NIFI_USERNAME} - SINGLE_USER_CREDENTIALS_PASSWORD=${NIFI_PASSWORD}   My docker compose .env file is HTTPS_EXTERNAL_PORT=8443 HTTPS_INTERNAL_PORT=8443 HTTP_EXTERNAL_PORT=8080 HTTP_INTERNAL_PORT=8080 NIFI_USERNAME=myUsername NIFI_PASSWORD=myPassword     Thank you for your help! ... View more