If it’s not the password of your printer that has changed, might be the certificate. Delete your connection and re-create it, you will get the certificate pop-up again, accept it, see if it’s resolved
Thanks a lot, yes… one of many in the 22, but that port for bambulab is not admited.
As i commented previously, the issue is that the bambu firmware/os(01.02.0.0) ftp server is crassing, and it recovers when the printer is restarted… do not last to much.