Check the username and password. (Exception from HRESULT: 0x8000401A) Parms:eafloader_could_not_instantiate_eafconnector

Hi we are getting the following error when trying to run a metadata refresh

Code: 0 Location: 0 The server process could not be started because the configured identity is incorrect. Check the username and password. (Exception from HRESULT: 0x8000401A) Parms:eafloader_could_not_instantiate_eafconnector

 Please can you advise where I go to check the username and password?

Regards

Paul