SQL Server does not exist or access denied

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I have a problem here. I tried to connect sqlserver as many time as I can in one function, because I want to know about the limitation of connection of sqlserver, btw, the sqlserver is not in my computer, the code is like : private void ExecuteCommand_ConnTest_process() { ArrayList conn = new ArrayList(3000); int num = 0; string conn_s = "..."; conn_s += "Connect Timeout=600;Max Pool Size=1000000;"; try { while ( true ) { conn.Add(new SqlConnection(conn_s)); ((IDbConnection)conn[num]).Open(); num ++; Thread.Sleep(10); } } catch( InvalidOperationException ioexp ) { StringBuilder buildError = new StringBuilder(); buildError.Append( "InvalidOperationException thrown when trying to connect " ); buildError.Append( ", error given = " + ioexp.Message); MessageBox.Show(builderError.ToString()); } catch ( Exception e ) { StringBuilder buildError = new StringBuilder(); buildError.Append( "Exception thrown when trying to connect " ); buildError.Append( ", error given = " + e.Message ); MessageBox.Show(builderError.ToString()); } finally { MessageBox.Show(builderError.ToString()); } } After certain number connections, such 6000, it throws an exception: "SQL Server does not exist or access denied". Then I found I can not access Internet. I have to restart my computer. Why this happened? What's wrong with my code? Could anyone please tell me? Thanks in advance!