Hi!
I just managed pppoe client on MT, but now msn is blocked.
When i was testing the router on my network it worked just fine.
Whit same settings and pppoe client added to the router, nobody can sign in with msn.
PLS help.
Tine
This is usually an MTU issue. Try the following:
/ip firewall mangle
add chain=prerouting protocol=tcp tcp-flags=syn action=change-mss change-mss=1360
Regards
ANdrew
The chain syntax wasnt recognized, so i got an error message.
Then i played arround with winbox and configured something like u send me and it trully started working!
Thanks alot ANdrew 
Sorry. Some v2.9 syntax slipped in there. Glad you got it working.
Andrew