ASA 5505 how to create a port forwarding rule

Question

ASA 5505 IOS ver 9.2.3
I need to create a firewall rule that will allow internal services to be accessed externally, but using port forwarding. For example I'd like to enable access to our NAS via ftp external on port 1545 and then have the ASA forward the request to the NAS internally on port 21.
I tried these commands but they didn't work:
object network NAS
host 192.168.2.8
nat (inside,outside) static interface service tcp 21 1545
access-list NASFTP-in permit tcp any object NAS eq 1545
conf t
int vlan 2
access-group NASFTP-in permit tcp any object NAS eq 1545
I really appreciate the help everyone.

Answer 1

try this, it worked for me, here is an example of adding a webserver with a ip of 10.10.50.60  and naming it with a object named www-server and forwarding port 80 , the way it works is you need to do three things, u need to "nat it" "foward it" and allow it in "acl"
object network obj-10.10.50.60-1
host 10.10.50.60
nat (inside,outside) static interface service tcp 80 80
object network INSIDE
nat (inside,outside) dynamic interface
object network WWW-SERVER
nat (inside,outside) static interface service tcp 80 80
access-list Outside_access_in extended permit tcp any object WWW-SERVER eq 80
access-group Outside_access_in in interface Outside