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

Run command prompt as administrator and type following command. netstat -ano | findstr ":80"

• a: Displays all connections and listening ports.
• n: Displays addresses and port numbers in numerical form.
• o: Displays the owning process ID associated with each connection.

In case if you are using a different port number then replace 80 with the appropriate port number.

The result would show a process id using the 80 port number in the last column. Either you can change the port number in your program or you can kill the process using 80 port number.