I'm not sure how you configured your flup, but probably you didn't ask for more 
than 100 persistent connections?

I ran into the same problem with DBUtils and MySQLdb, even when there should 
have been only 10 persistent connections. 

If I didn't overlook something, DBUtils doesn't close connections when the
 Python process exits. So, I suspect that when the application server gets 
restarted frequently (i.e. during development), all those abandoned connections 
will pile up inside the database server and at some point exhaust its 
connection pool. 

I use a homegrown scheme for connection persistence now - it explicitly closes 
all persistent connections when Python exits.  No problems since then. You 
could add that to DBUtils, too, I guess. Alternatively, I could also send you 
my code if you're interested. Michael.

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