Hi,
I just installed amule (from sources! after trying the stock one) on my debian-lenny server.
I opened the relevant ports on my router and testport says:
Success The TCP port 52706 is available. You should be able to use the ED2K P2P service without any problems.
... which looks good

Unfortunately amule says:
2010-07-31 18:46:11: ServerSocket.cpp(419): WARNING: You have received Low-ID!
2010-07-31 18:46:11: ServerSocket.cpp(420): Most likely this is because you're behind a firewall or router.
2010-07-31 18:46:11: ServerSocket.cpp(421): For more information, please refer to
http://wiki.amule.org... which does
not look good

What should I check?
TiA
ZioNemo
P.S.: Before You ask: Yes, I tried also with the standard port.
ZioNemo