Question

netstat TIME_WAIT

Asked by: rickyr

hi...

Sparc-10, Sol 2.4, 192Mb, running SQL Server.

Here is list of connections to a database listening on port 4100. I don't have a problem with the "ESTABLISHED" connections. But what about the "TIME_WAIT" ones? Whats happening here? and why does output of....
#netstat -n | grep 194.70.47.151.4100 | wc -l
vary constantly from 70 to 110. Users log in once, then log out at the end of the day (12 at the moment).

# netstat -n
TCP
   Local Address        Remote Address    Swind Send-Q Rwind Recv-Q  State
-------------------- -------------------- ----- ------ ----- ------ -------

194.70.47.151.4100   194.70.47.151.52448   8192      0  8192      0 ESTABLISHED
194.70.47.151.54716  194.70.47.151.4100    8192      0  8192      0 ESTABLISHED
194.70.47.151.4100   194.70.47.151.54716   8192      0  8192      0 ESTABLISHED
194.70.47.151.2001   194.70.47.1.2049     17520      0  8760      0 ESTABLISHED
194.70.47.151.54939  194.70.47.151.4100    8192      0  8192      0 ESTABLISHED
194.70.47.151.4100   194.70.47.151.54939   8192      0  8192      0 ESTABLISHED
194.70.47.151.55231  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55233  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55235  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55237  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55239  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55241  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55243  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55245  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55247  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55249  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55251  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55253  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55255  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55257  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT
194.70.47.151.55259  194.70.47.151.4100    8192      0  8192      0 TIME_WAIT


regards

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
1998-01-29 at 08:01:14ID10037369
Tags

netstat

,

time_wait

Topic

Unix Networking

Participating Experts
2
Points
30
Comments
4

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. Netstat
    Hi there, I want to make a gui version of netstat. But how can i read wich connections are open ? api ? If someone has some examples for me i would appericiate it, Kind regards, Arijan
  2. netstat -a
    What does the output from netstat -a command mean on unix. Usually it says LISTEN, ESTABLISHED. But what does TIME_WAIT mean, is there a good reference to these messages?
  3. Netstat
    I ran netstat and I am wondering about this: D:\>netstat What does unknown.level3.net mean? Active Connections Proto Local Address Foreign Address State TCP mbs-h:3244 localhost:3245 ESTABLISHED TCP mbs-h:3245 ...
  4. netstat
    hi All, I have winxp with SP2 and the firewall is on, I use some downloading programs like IMesh, but when I open this program and without making any downloading or searching, I can see some transactions. When I used netstat -an command, I found alot of established connect...
  5. NETSTAT question
    I am showing ports here that only one is Listening which port 631 and I need that to print. But as you see below, for example, PORT 68 is there but not listening...WIll this pose a problem??? And yes, I am running a Linksys SPI Firewall, but how can I stop these other ports b...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: ahoffmannPosted on 1998-01-29 at 10:02:26ID: 1583100

does man netstat not give the answer?

 

by: rickyrPosted on 1998-01-29 at 10:20:48ID: 1583101

Sort of!!!!

TIME_WAIT - Wait after close for remote shutdown retransmission.

It doesn't make much sense to me, There are no remote shutdowns.
Anyway what is a remote shutdown retransmission when it's at home. I really need a detailed explanation of whats going on here. The network connections vary wildly but the users on the system are constant

 

by: rjhowardPosted on 1998-01-29 at 14:54:54ID: 1583102

Found this article in our Knowledge Base.  Hope it helps.

Question:
     Sun Solaris: Why do ports get stuck in the TIME_WAIT state?

     Configuration Data:


     Answer:
     This is due to the 2MSL timeout value, which is a part of the TCP specification. After a connection has been closed by
     both the client and the server, the port becomes unavailable for a certain amount of time, so that a new program does not
     inadvertently get packets that were intended for the old program. On Solaris machines, the 2MSL value may be modified
     by adjusting the /dev/tcp tcp_close_wait_interval ndd variable. (ndd -set /dev/tcp tcp_close_wait_interval value.)

     Q: Why do I get "address already in use" when I try and reuse a port which a previous program had used.

     A1: It could be that the port is still in the TIME_WAIT state (see above). You may confirm this by running netstat, and
     examining the port in question. If this is the case, you must simply wait the couple of minutes it will take for the port to get
     out of the TIME_WAIT state.

     A2: It could be that the program you are using does not correctly list the port as one that may be reused. You should
     verify that your program is setting the SO_REUSEADDR socket option.

     References to Procedures:


     Additional Information/Comments:
     For additional information on how to use ndd to change TCP parameters, do man ndd. Under Solaris 2.5 or higher, you
     will need to be root to display network configuration values using ndd.The above information is from Sun Technical
     support. SO#: 3165922 - TCP Questions
     Product Support Document (PSD) for Sockets Programming Including Sockets Programming
     Revision 1.3
     Date: April 9, 1996

 

by: rickyrPosted on 1998-01-30 at 15:27:04ID: 1583103

Hello rj....
Thanks for that detailed answer. It makes alot of sense to me
as The users that log in do not send/receive anything for long periods of time while they are doing other tasks, this could explain the time-outs you talk about, along with the rest of the info you supplied, This is a good starting point for more investigation.

Thanks again

ricky

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...