The usb drives are connected to a mac mini, mounted in catalina and are accessable from the machine with the drives attached. 
When this machine is approached over a lan the all drives are listed, internal and external.
Internal drives can be browsed remotely but when an external drive is selected I get the message:
		
	
I have a second machine with the exact same configuration and that works fine.
I've tripple checked permissions.
Regards
	
		
			
		
		
	
				
			When this machine is approached over a lan the all drives are listed, internal and external.
Internal drives can be browsed remotely but when an external drive is selected I get the message:
I have a second machine with the exact same configuration and that works fine.
I've tripple checked permissions.
Regards