Please correct me if I'm wrong, should not you defined only the ftp server ip address in the access list tied to the ip nat service?, please try to do a simple configuration and see if it works, example:
access-list 1 permit host 192.168.1.135 ip nat service list 1 ftp tcp port 1600
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...