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For the older MAC OS up to 10.14 (not sure exactly) it is quite simple as some post above.
For the newer systems (since two years ago) you need to DISABLE packet signing on the MAC. That´s the new security feature, which prevents Ricoh copiers to save files using SMB protocol. Win systems are good, but Macs must be altered via the terminal and SCUTIL.
commands are as follow:
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.smb.server.plist SigningRequired -bool FALSE
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.smb.server.plist SigningEnabled -bool FALSE
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.smb.server.plist SMB1SigningEnabled -bool FALSE
sudo /usr/libexec/smb-sync-preferences (this one will probably say that this service is not running
Since 10.15 you have to add this commands:
echo “[default]” | sudo tee -a /etc/nsmb.conf
echo “port445=both” | sudo tee -a /etc/nsmb.conf
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