Answered question

I ran a test with lots of virtual users and I got many NL-NETWORK-01 errors?

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.

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