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

Hi All,

Looking at the attached diagram - My server is IP 10.x.x.x and the client is on 172.x.x.x.

10.x.x.x Server sits in Our DataCentre. The PC on 172.x.x.x is a DMVPN Site

I have complaints from users at this site when using a system to upload/download files. I have about 20 other sites who use the system also with no complaints. Bandwidth Utilization at the sites is not saturated.

Looking at the screenshot - does this suggest that it is my server having buffer issues? ( Trying to decipher what the actual messages are telling me.

Thanksalt text

![alt text][2]

asked 23 Sep '15, 06:32

exit12's gravatar image

accept rate: 0%

edited 23 Sep '15, 06:33

Yes your Server has a full receive window and the client tests if the window is still at the zero size. What is the OS at the server?

permanent link

answered 23 Sep '15, 09:51

Christian_R's gravatar image

accept rate: 16%

Hi Christian,

The server side is actually a Linux machine I believe. I've attached another screenshot from the conversation as I just want to understand what each part means.

Looking at packet 4248 - it looks like the server reports a TCP Zero window. What does the 8010 - 63607 numbers represent/mean? Also seen in packet 4305, 4509, 4788.

Thanksalt text

(24 Sep '15, 02:27) exit12

8010 is the Source Port and 63607 is the Destination Port of that packet.

(24 Sep '15, 11:38) Christian_R
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: 23 Sep '15, 06:32

question was seen: 1,188 times

last updated: 24 Sep '15, 11:38

p​o​w​e​r​e​d by O​S​Q​A