I am using an Canon print workstation to send files to OS X. Unfortunately OS X El Capitan uses SMB3. It's no longer possible to send files scanned PDF files to OS X. How can I switch back to SMB1 for the OS X El Capitan SMB file service?
Update: The command isn't correct.
echo "[default]" >> ~/Library/Preferences/nsmb.conf; echo "smb_neg=smb1_only" >> ~/Library/Preferences/nsmb.conf
It sets the default network protocol to the slower but more reliable SMB 1 protocol. However I don’t want to connect to a SMB Windows file server. It’s the other way around. I am using the built-in OS X SMB file service (SMB3) and the printer connects to OS X.
Anyway, there aren’t many articles on how to force OS X SMB server to use SMB1. There is also a application SMBUp which replaces Apple’s OS X native netbios and SMB services. You can find a detail tutorial here
Solution: Finally I said goodbye to SMB and switched to FTP file protocol.