wbinfo not responding

[achaturvedi]

Hello,
when i start my winbindd from /usr/local/samba/bin it works, i check it by ps -ae | grep winbindd

But when i issue a wbinfo -u i get following error message:
"Error looking up domain users"

for

wbinfo -p
"`ping` to winbindd failed
could not ping winbindd!"

I was using wbinfo -I and smbclient -M without any problems till yesterday.
I dont know what has suddenly gone wrong.
Note:
ps -ae | grep winbindd works fine.

Very URGENT help required

ajay