flash media server port connectivity check

HI,

i ran the the tests at http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_16466 to figure out
if i can connect to fms from my network.

following are the results:

MAC 9,0,115,0

RTMP DEFAULT TimeOut
RTMP 80 Success
RTMP 443 TimeOut
RTMP 1935 Success
HTTP Tunneling DEFAULT Success
HTTP Tunneling 80 Success

but what i would like to know is that: RTMP default fails, but rtmp 1935 succeeds, is n't rtmp 1935 the default?

also, does the above tests actually send rtmp traffic before confirming that port 1935, or any other port is open
for rtmp traffic or they just open a tcp connection and return?

so a basic question is: how reliable are the above tests and if the tests use AS2 code or AS3 code running inside my browser?

thanks,
Sunil