telnet --- sockets ?

[maximilianscherr]

it's very stange:

server is sending a string about 20 to 80 chars in brackets[]
with s infront of it, if the server gets a sring "sservinfo"(newline 
terminated).

i got different codes:

with telnetlib:

...thewholeconnstuff
s.write("sservinfo\n")
res = s.read_until("]")
print res

output: the string that should be send, so -> WORKS

with socket:

...thewholeconnstuff
s.send("sservinfo\n")
res = s.recv(128)
print res

output: no output, it hangs!, so -> DOESN'T WORK

now can anybody tell me why?
i also tried lower buff numbers