Re:

I really don't know what is happening, why postgres hang and didn't close the connections. This django web interface is used only for management and viewing logs, most server have two users only.

I've sent this email just to know if one of yours have seen this, or something like this, before.

use lsof or equivalent to determine what process owns the other side of the socket that one of those processes is listening on.   my guess is, you're not releasing resources in django and they are piling up.

-- 
john r pierce, recycling bits in santa cruz