Err: Running short of concurrent connections

#1
We are getting this error constantly.

Running short of concurrent connections.

Everything was working fine earlier. Today we upgraded to newest version 4.0b3

Also, i see very irregular data usage stats.

At times, it shows 0 kb outgoing traffic.
and then suddenly 1000 kb outgoing.

Please suggest some remedy
 
#3
the maximum connections are 2000 right now
And the number of requests per second average between 50 -120.

Its 2 Core CPU license and we are running only one listener.
 
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