Hi Arne,

Yes I received a response and I send the ACK to it. This is correct as I can send ping and pong messages to the peer after that (it works fine with the ping and pong messages).

I used to do my tests locally Phex and frostwire, the node accessed over the internet is a limewire peer (version 5.x.x.)

Actually I don't implement the vendor code (0x31) and the query routing protocol (0x30), are theses two messages mandatory to have a good communication to the peers ? If I read the RFC, these two messages are recommended but not mandatory.

Regards
Juan