During a FTP upload test, if sequencer log view gives an error: 550 can’t access,
Problem Overview
During a FTP upload test, if sequencer log view gives an error: 550 can’t access,Resolution
most likely the ftp server does not have access to do an upload. For example-The guest ftp server of Viavi Solutions does not allow us to upload any documents. It only has access for downloads. Note - The 550 error usually can be seen in older versions of RANAdvisor like 18.0.x. For newer versions of RANAdvisor 19.0.x, below is a screenshot of the error message: 
Hardware or Software Version
18.0.x