uTorrent does not make any connection through MikroTik RB751U-2HnD.
I have disabled NAT-PMP and uPnP in uTorrent, and I select one single port 42056.
On router I have srncat masquerade on Out Interface.
Maybe someone have advice about such a topic like MikroTik-uTorrent behing NAT.
THX
just open port 42056 (udp/tcp) to your internal ip and it should work. dstnat rule inbound …
I have dynamic IPs (DHCP)
I have tried rules 0 and 1, but still nothing is better.
NAT:
0 chain=dstnat action=dst-nat to-ports=42056 protocol=udp in-interface=ether1-gateway src-port=42056 dst-port=42056
1 chain=dstnat action=dst-nat to-ports=42056 protocol=tcp in-interface=ether1-gateway src-port=42056 dst-port=42056
2 ;;; default configuration
chain=srcnat action=masquerade out-interface=ISPname
THX
I found the solution. 
THX
yep - just remove src-port=42056 from the rules you posted.
Dunno what solution you found, but here’s my setup:
/ip upnp
set allow-disable-external-interface=no enabled=yes
/ip upnp interfaces
add interface=wan type=external
add interface=lan type=internal
I get lots and lots of dynamic nat rules from utorrent and other applications. Works a treat!
I encounter the same problem.
My wan connection is PPPOE
lan gateway is 192.168.0.1
internal client’s IP address is 192.168.0.223
the utorrent use port 56667, here is my nat config for utorrent.
/ip firewall nat
add action=dst-nat chain=dstnat comment=utorrent dst-address=\
!192.168.0.1 dst-port=56667 protocol=tcp src-address=!192.168.0.0/24 \
to-addresses=192.168.0.223 to-ports=56667
but the utorrent tells " Port is not open (you are still able to download)", what the problem of this nat config?
BTW, I don’t want to use upnp.
Im using transmission on ubuntu with port 51413 and says that is Open when you go to click it.
/ip firewall nat
add chain=dstnat action=dst-nat to-addresses=192.168.1.3 to-ports=51413 protocol=tcp dst-port=51413
using UPnP can be a security risk but then again so is torrents lol 
My router is now running 6.34.2 and none of these settings work. Did they change “wan” and “lan” to another set of words?
Intead of “wan” and “lan”, use real names of your interfaces, e.g. “wlan1” or “ether1”.