HttpClient: Only one usage of each socket address (protocol/network address/port) is normally permitted

Question

using (var client = new HttpClient())
{
 client.BaseAddress = new Uri(Url);
 client.DefaultRequestHeaders.Accept.Clear();
 client.DefaultRequestHeaders.Accept.Add(ne         


        

Answer 1

I hit the same in my load generator tool which tried to send 200 requests/sec to one server.

I moved from new HttpClient instance per request to a singleton and it did address it.

One note - initially I hit 2 requests/sec bottleneck but setting DefaultConnectionLimit to 500 solved it:

ServicePointManager.DefaultConnectionLimit = 500;