econnreset 127.0.0.1

ECONNRESET (Connection reset by peer): 
A connection was forcibly closed by a peer. 
This normally results from a loss of the connection 
on the remote socket due to a timeout or reboot. 
Commonly encountered via the http and net modules.

Since a large number of requests are hitting the server, 
it is getting overloaded 
(busy servicing previous requests before it can handle any new request).
serhii.nahornyi