title: NPGSQL connection error during performance testing
body: <p>We have .net core service, connected to postgres database via npgsql. When load test is running, ef thows error</p>
  <pre><code>An error occurred using the connection to database `'it2_trading_servicing' on server 'tcp://172.18.130.173:5432'.` 
  </code></pre>
  <p>The inner exceptions (shown by diagnostics listeners) are:</p>
  <pre><code>Exception while connecting
  </code></pre>
  <p>and</p>
  <pre><code>The operation has timed out.
  </code></pre>
  <p>There are no any details.</p>
  <p>Here is constring
  &quot;Host=172.18.130.173;Port=5432;Database=it2_trading_servicing;UserId=*<em><strong><strong>;Password=</strong></strong></em>&quot;,</p>
  <p>DBA man says the DB is OK and there are many opened connections</p>
  <p>Please assist how to overcome this problem</p>