Samba mount problem

Hi.
I'm trying to mount a smb filesystem but it's not working.
I'm using:
mount -t smbfs //share/ /mnt/win_c -o ip=200.134.x.x -o
username=admin,password=pass
Note that '//share/' '200.134.x.x' and username/password are
replacements for the real params.

But, when I run it, it gives me a output like:

timeout connecting to 200.134.x.x:445
timeout connecting to 200.134.x.x:139
Error connecting to 200.134.x.x (Operação já em progresso)
//operation already in progress
2815: Connection to share failed
SMB connection failed

My Network is ok, and via Konqueror I am able to open it without any
problem.

Any Hint?
Thanks.
Vinicius 'Corvu' BR