title: Understanding TCP RST in Wireshark
body: <p>I need help to understand the red and black errors in Wireshark (see the attached screenshot). Those errors are produced when I try to access a large PDF file hosted in a static folder on IIS.</p>
  
  <p>My knowledge of TCP protocols is very limit. Any help is really appreciated!</p>
  
  <p><a href="https://i.stack.imgur.com/nmu0B.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nmu0B.png" alt="enter image description here"></a> </p>