ye.
Some ISP forbid the use of p2p applications, such as aMule, by not allowing traffic through popular p2p ports. In these cases, configure aMule to use some other port. It would be even better if it was some popular port used for some other issue. It's been known that on some ISPs it worked with port TCP 25600.
Some ISPs, instead fo blocking, just shrink the traffic on those ports. check it, please
greetings!