My load generators are running under Windows 2008 R2 and the error details are "No buffer space available" (maximum connection reached?). How can I get rid of these errors?
During the load test, the load generators will open a large number of network connections against your application server.
The default number of port/connections that can be opened at the same time is limited and not enough for high load testing. When you reach those limits, you can have these NL-NETWORK-01 errors on Windows 2008 or Windows 7.
In that case, you have to increase these values in order to get a larger range of port availability. To do that, open a command prompt as administrator and run the following commands:
netsh int ipv4 set dynamicport tcp start=10000 num=50000
netsh int ipv6 set dynamicport tcp start=10000 num=50000
This will allow 60000 concurrent connections.
For more information about load generators tuning, see "Advanced Installation" under "Installation" section.