?
Solved

Maxing out TCP ports?

Posted on 2013-06-24
2
Medium Priority
?
414 Views
Last Modified: 2014-01-05
Dear colleagues,

I'm having a odd issue with Wowza Media Server and I'd really appreciaite if you guys could help me.

I'm currently using Wowza Media Server 3.6 in a 4-CPU Windows Server 2008 R2 x64 machine, with Java JRE7 x64, with 8 GB RAM. This server has been properly tuned used Wowza's Performance Tuning instructions (http://www.wowza.com/forums/content.php?5-general-tuning). This server is running in an uncapped 1 Gbps connection in a world-class datacenter.

The server performs perfectly in low and mid-load scenarios. When can successfully stream to around 1000 concurrent users (300 Kbps streams). However, after that threshold, we starting seeing drops, freezes, to the point that it stops serving streams altogether.

The odd thing is: the CPU load, network usage and memory load are way below "saturation" levels. I don't see a reason why it should be falling apart, with some many resources being still available when the error occurs.

So I started wondering whether this could be related to unavailability of TCP ports or any kind of lack of specific TCP tuning. I followed the instructions at http://kb.globalscape.com/KnowledgebaseArticle10438.aspx to try and tune Windows TCP configuration, but the problem still persists.

Am I missing something here? Are there any additional fine-tuning that we need to make in Windows Server 2008 in order to surpass the 1000-concurrent-user threshold?

Thanks in advance!

Helder
0
Comment
Question by:HelderConde
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 12

Accepted Solution

by:
ullfindsmit earned 1500 total points
ID: 39272534
If I was to guess, it could have something to do with file handles (pointers) and when there are too many of them, they tend to create deadlock scenarios
0
 

Author Closing Comment

by:HelderConde
ID: 39757414
I realized the issue was in our applications. As time passed by under heavy load, thousands of concurrent connections to the SQL server was bring things down.

We made a connection pool and rewrote everything to correctly handle usage of ports.

Thanks!

Helder
0

Featured Post

NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Sometimes drives fill up and we don't know why.  If you don't understand the best way to use the tools available, you may end up being stumped as to why your drive says it's not full when you have no space left!  Here's how you can find out...
This article explains how to install and use the NTBackup utility that comes with Windows Server.
This tutorial will give a short introduction and overview of Backup Exec 2012 and how to navigate and perform basic functions. Click on the Backup Exec button in the upper left corner. From here, are global settings for the application such as conne…
This tutorial will show how to configure a single USB drive with a separate folder for each day of the week. This will allow each of the backups to be kept separate preventing the previous day’s backup from being overwritten. The USB drive must be s…
Suggested Courses

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question