This is our old Q&A Site. Please post any new questions and answers at

So I've been developing client/server software (for an MMORPG).

Sometimes, randomly it would seem, users get disconnected from the server for no reason...

We finally managed to capture this incident using WireShark...

It would seem the client is sending a [RST, ACK] packet to the server.

Why could this be happening? The dedicated computer hosting the server has a firewall on, but it is set to allow connections from the port that the client connects to... On top of that the clients ARE able to connect, they just disconnect sometimes...

Here's a picture of the packet in question,

It has the same Ack# as the previous packet, so here's a picture of that one too...

asked 25 Oct '15, 12:37

Ricky%20Rodrigues's gravatar image

Ricky Rodrigues
accept rate: 0%

edited 25 Oct '15, 12:55

I think it is the same picture.

(25 Oct '15, 12:43) Christian_R

Sorry here is the other SS...

(25 Oct '15, 12:54) Ricky Rodrigues

Could you provide us a trace on public accessible place (e.g.

(25 Oct '15, 15:02) Christian_R

Not so easy to tell with just this screenshot. But the session looks quite calm until this RST shows up. If I were you I would look deeper at the side, and look what the app log is telling you. Because, in this case it seems to me that the most probably reasons for this RST is an app related problem at the side.

permanent link

answered 25 Oct '15, 12:51

Christian_R's gravatar image

accept rate: 16%

edited 25 Oct '15, 12:54

I am not an expert with wireshark but looking at the pics the client side window value is always low and there are no window updates being pushed through so this could be a good place to look also.

permanent link

answered 26 Oct '15, 02:11

m0rph's gravatar image

accept rate: 0%

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 25 Oct '15, 12:37

question was seen: 3,997 times

last updated: 26 Oct '15, 02:11

p​o​w​e​r​e​d by O​S​Q​A