So this is what I did to solve it... I noticed that the cURL generated by postman was not working and getting the exact same error you are seeing on the UI, this cURL command looks something like: curl --location --request POST -k 'https://{{host}}:8089/services/auth/login' \ --data-urlencode 'username={{user}}' \ --data-urlencode 'password={{password}}' So What I did was: Go into Postman and click IMPORT On the import Dialog go to the RAW Text tab and paste this: curl -k https://{{host}}:8089/services/auth/login --data-urlencode username={{user}} --data-urlencode password={{pass}} And hit IMPORT, this will generate a working request. If you look at the cURL generated by it the only difference is that it actually sets the Content-Type header which seems to so the trick. It now looks something like this:   curl --location --request POST -k 'https://{{host}}:8089/services/auth/login' \ --header 'Content-Type: application/x-www-form-urlencoded' \ --data-urlencode 'username={{user}}' \ --data-urlencode 'password={{pass}}' Trying this curl command on the terminal will also work.   ... View more