Random connection loss

Hi:
I have a WRT54G v5 router that I use only for its hardware firewall with my standalone desktop PC. I am losing internet access every few hours, even though all the LED's on my cablemodem and router remain green. I invariably have no connection when I first turn on the PC, although a warm reboot does not lose the connection. The only way to re-establish my connection is to release/renew DHCP. I have the latest firmware offered at the Canada website (1.00.9). A router reset, and power-cycling both the modem and the router hasn't helped. I'm not a gamer, and my connection speeds are good.
I'm not very savvy about routers, but suspect that some setting isn't right. Any advice would be much appreciated.
EDIT: Don't know if this helps, but the Tweak Test over at dslreports seems ok:
http://www.dslreports.com/tweakr/block:eac75f?service=cable&speed=6000&os=winXP&via=normal
Message Edited by gaslad on 01-09-200708:30 PM

Thanks, Carrot:
Are you sure it is safe for me to use the firmware v1.01.1 from the US site? I bought this router in Canada, and the US download site says:
"Downloads are for US products only.
If you have purchased a product in another country/region please go to that
country/region's website for the correct product download."
The Linksys Canada download site does not offer FW 1.01.1
Meanwhile, I got TCP Optimizer, and reset the MTU as it advised to 1500. I will report back in a day or so, if this has helped.

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Hi all! I have an E3000 router that is hooked up to a modem through a cable ISP (Bright House) that also supplies my home phone (don't know if that matters). I have two wired computers and two to four wireless items (computer, game box, cell phones). I have had the router for about 4-6 months and have just started getting these connection problems. It will randomly lose the connection for both wired and wireless systems. Sometimes it will fix itself and others I have to hard reboot the router. I have connected one of the computers directly to the modem and found that there were no connection issues at that time.
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I am using an FTDI chip to go from USB to serial communication (FTDI Driver: 2.06.00). It seems to work at first but then after some time the connection gets lost ("connection for the given session has been lost" or "I/O error"). This happens in MAX as well as the built executable of the program I am running. Latest VISA drivers are installed - 4.6. I have tried flushing the buffer before and after communication with both visa clear and visa buffer flush vis. The lost connection seems to happen randomly.
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I am having this problem for a month now, and i am stumped with trying to find an answer . I have talked with several network admins in my area and with no luck i have not found a solution. I have a windows server 2012 placed with 5 pcs that are connected
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1x Windows 7
4x Windows XP SP3
All have the latests network drivers, all have the latest version of remote desktop installed. All have been scanned for viruses. All have antivirus software.
Problem is the 4 XP machines lose connection on when connected via remote desktop. If one starts losing connection the other 3 start to lose the connection aswell. The windows 7 machine is not affected by this it works fine.
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Turning off SMBv2 SMBv3.
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TASK MANAGER
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I'm having strange random connection failures. Are there ineffieciency in my config?

I've been having strange, random connection failures and I'm trying to eliminate possible causes.
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    logging buffered 51200 warnings
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    no ip gratuitous-arps
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[EDITED]
dot11 syslog
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   dns-server 192.168.10.1
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ip auth-proxy max-nodata-conns 3
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ip domain name [my url]
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ip ssh version 1
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ip virtual-reassembly
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Connection loss SUM GUI to SL Controller

Hi experts,
I am experiencing an issue that I need to resolve. It is that I lose the connection from SUM GUI (locally) to the SL Controller running on the remote server.
Currently I am doing an upgrade and after some time, e.g. when I have an error and don't notice it immediately, I get a warning message.
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The SDT GUI will reestablish the connection, when possible."
On the server I get the following error message:
May 26, 2014 7:49:47 AM [Error]: com.sap.sdt.engine.core.communication.FactoryAlreadyRegisteredException: Factory for key 'com.sap.sdt.engine.core.com
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May 26, 2014 7:49:47 AM [Error]: com.sap.sdt.server.core.ServerException
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May 26, 2014 7:49:51 AM [Error]: com.sap.sdt.engine.core.communication.SendException: Error while sending data.
Network input/output exception has occurred: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
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javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
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May 26, 2014 7:49:51 AM [Error]: com.sap.sdt.engine.core.communication.SendException: Error while sending data.
Network input/output exception has occurred: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Broken pipe
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The main issue then is:
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Currently I always had to restart SUM including the services on ther server (SL controller).
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Hi Mathias,
I got an answer from SAP. There is no option that can be executed with STARTUP to solve this.
I already proposed to forward this request to the dev team at SAP
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This is a really bad solution, but currently the only one.
Regards,
Niklas

Why do I have Intermittent Wifi Connection Loss during music streaming ?

Hello,
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Try #5.
Some things to try first:
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http://ipadinsight.com/ipad-tips-tricks/potential-quick-fixes-when-your-ipad-won t-connect-to-your-wifi-network/
~~~~~~~~~~~~~~~~~~~~~~~~~
Wi-Fi Fix for iOS 6
https://discussions.apple.com/thread/4823738?tstart=240
iOS 6 Wifi Problems/Fixes
How To: Workaround iPad Wi-Fi Issues
http://www.theipadfan.com/workaround-ipad-wifi-issues/
Another Fix For iOS 6 WiFi Problems
http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
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Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
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http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
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Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
~~~~~~~~~~~~~~~~~~~~~~~
How to Boost Your Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Boost-Your-Wi-Fi-Signal.h tm
Troubleshooting a Weak Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/Troubleshooting-A-Weak-Wi-Fi-Sig nal.htm
How to Fix a Poor Wi-Fi Signal on Your iPad
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Fix-A-Poor-Wi-Fi-Signal-O n-Your-iPad.htm
iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Connect iPad to Wi-Fi (with troubleshooting info)
http://thehowto.wikidot.com/wifi-connect-ipad
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
Wi-Fi or Bluetooth settings grayed out or dim
http://support.apple.com/kb/TS1559
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

Since I upgraded to Moutain Lion I'm dealing with wifi problems : no connection or random connection

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So, Darrall, it seems to be fixed. Mind you, this has happened through a seemingly unrelated, but hopefully replicable sequence of events. You be the judge.
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Now, my secondary click works. Uh huh. I was suspicious that it might have more to do with Mission Control and/or Dashboard than the trackpad, only because I'd beaten that horse till my arm hurt and this was all I could think of.
Never did I imagine this would get fixed short of creating a new login account and somehow copying everything - since I didn't know what was wrong, I could easily have copied the error too - so I'm very pleased and relieved. If you haven't fixed yours yet, try this. Let me know what happens!

Connectivity loss between PLC and Kepware

Hi Experts,
I m working on SAP PCo and PLC connectivity using Kepware.
I m trying to find out ways to find connectivity loss between
1) PLC and kepware
2) kepware and PCo
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Internet connection loss using Airport Extreme and Netgear DG843

Hello,
I am accessing internet via a Netgear DG834 router (not wifi), connected to an Airport Extreme base station. Most of the time, I can access internet through the Wifi network of the AEB without any problem. But around once a day I am experiencing connection loss and the only way I found to restore it is to reset the Netgear Router by physically unplungging it.
Both the Netgear and the AEB have up to date firmware, so I suspect some kind of problem in my setup, as I am not an expert in setting up networks.
Is it possible that using a Netgear Router connected to the AE (which is also a router if I understand correctly) could cause connection problems ?
I am at a loss, and do not even know how to describe the relevant informations of my current setup. If a kind soul could help me nonetheless, I would be very gratefull.
Mr Pedrito
Powerbook G4 Mac OS X (10.3.9)

Is it possible that using a Netgear Router connected
to the AE (which is also a router if I understand
correctly) could cause connection problems ?
Yes.
Ensure that that the AEBS is configured to not distribute IP addresses.
Also ensure that the AEBS is on a different channel to the DG834G.
iFelix

Bluetooth randomly connecting to devices?

Been having this weird issue in our office. I have a 2014 MBP running Yosemite, and there are 2 new iMacs and a nMPro on the same network also running Yosemite. One of my partners also has a Bose Bluetooth speaker. FYI the other Macs and I all have bluetooth Magic Mouses.
My MBP has been randomly connecting to these other Macs/devices randomly, on it's own. The other Macs will show up as a connected device, even though I have never connected to any of them previously (nor would I, since there's no good reason to connect to them via BT since we're all on the same network already). The Bluetooth speaker is a device I've connected to in the past, but it's automatically connecting to it and that's annoying; just today he was listening to music through it from his MBP (running 10.8) and my MBP interrupted that and attempted to take over the speaker from his Mac.
Previously I found a post about deleting some BT prefs to knock off the connecting to other Macs -- but the article blamed this on the other machines, not mine. I'm starting to wonder if it's not me though; is there something I should delete on my end to clear this mess up?
TIA,
JVK

The only thing I can think of is to reset the device(s).
Be sure, of course, that Bluetooth is set to on.
What are you trying to connect?
Barry

Random Connection Closed Errors using UCP

Hey All;
I am trying to figure out why we are seeing quite a few random connection closed errors in our applications that are using Oracle UCP ver 11.2.0.1.0 connection pooling.
The errors happen at arbitrary jdbc usage source code locations (e.g.: spots that check a connection's auto commit mode, spots that spool through a result set, spots that do yada..) that consume a connection, and are not affiliated with what is being done with the connection (SQL being ran).
The architecture is Tomcat 7, hitting Oracle 10g Enterprise Edition Release 10.2.0.4.0 (RAC). The structure of the code (it's a web app) is such that we have a servlet filter that assigns a http request thread a connection from the pool on an incoming request, then that same connection is closed at the completion of that request's handling. No code uses connections other than code related to handling an http request. And, no threads are spawned off of that request handling thread. And, no code whatsoever (other than the servlet filter's finally block) ever closes a DB connection.
Also, the number of connections in the pool is quite adequate for the usage of the pool. That is, the ceiling is likely never hit. Even if it were---- having an outstanding connection suddenly 'closed out' wouldn't be the proper behavior there.
What are the things that can cause a connection to be 'closed out from under you' ? Meaning, the connection is valid when taken from the pool, but arbitrarily in the middle of usage--- it gets closed.
I am pretty stumped at this point.
Any ideas?
Thanks--

Here are a few sample stacks. Keep in mind that the line of code where the exception actually happens is arbitrary. We see the exception happen at ANY line that is a consumer of a connection. For example... it could happen that it blows up on the 'Nth' iteration while trucking through a result set. Suddenly at say... iteration 143 the connection is suddenly closed out from under the connection's handle.
As far as threads are concerned, each http request that creates a controller servlet instance is assigned it's own connection to use through the handling of that request. That connection instance is assigned as a ThreadLocal instance. Any DB usage that thread has is via that connection. The servlet filter ensures the handle is assigned when the request comes in, then is cleaned up as that request is completely handled in the same filter's finally block (this is a pattern that dozens of web apps we have have been using for going on 10 years now). This is not an ejb app. Straight Tomcat 7 web app using MVC pattern where C is a servlet.
The curious thing here in my mind is that we only have two apps in our collection that are using this new UCP pooling driver (most other are using a tomcat pool). And, only those two are seeing this behavior.
I am not balking at the threads concern--- it's just hard to square that with how we handle threading in such a 'single thread per http request' manner.
And, if it were the case that the pool is handing out the same connection handle to more than one thread because of having multiple entrant threads to the pool accessor method---- it's difficult to buy that it's that common for us to have multiple entrant threads at the same moment in those very short time span it takes for a pool to hand out a connection (given the traffic usage pattern for the app).
Here are the 'known deltas' I am aware of between the two apps that have this behavior, and the couple of dozen we have that do not:
1) these two apps are on Tomcat 7 (most others are Tom 5, Resin, or JBoss)
2) these two apps are using the Ora UCP pool. (most others use Tomcat pool)
~~~~~~~~~ Stack 1 ~~~~~~~~~~~~~~~~~~
01-Dec-2010 12:34:13.479 [ERROR] JDBCExceptionReporter: The connection is closed: The connection is closed
01-Dec-2010 12:34:13.479 [ERROR] PartsGroupingPanel: getDealersInventoryRow() pvid FO03348
org.hibernate.exception.GenericJDBCException: could not inspect JDBC autocommit mode
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:91)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:79)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at org.hibernate.jdbc.JDBCContext.afterNontransactionalQuery(JDBCContext.java:228)
at org.hibernate.impl.SessionImpl.afterOperation(SessionImpl.java:437)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1134)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at com.dmotorworks.partinventory.dao.ClientParametersDAO.getAllDealers(ClientParametersDAO.java:20)
~~~~~~~~~ Stack 2 ~~~~~~~~~~~~~~~~~~
01-Dec-2010 11:23:54.889 [ERROR] PartsSearchDAO: getDealerInventoryLineItemsNofN()
java.sql.SQLException: The connection is closed: The connection is closed
at oracle.ucp.util.UCPErrorHandler.newSQLException(UCPErrorHandler.java:526)
at oracle.ucp.util.UCPErrorHandler.newSQLException(UCPErrorHandler.java:510)
at oracle.ucp.jdbc.proxy.JDBCConnectionProxyFactory.invoke(JDBCConnectionProxyFactory.java:245)
at $Proxy0.prepareStatement(Unknown Source)
at com.dmotorworks.partinventory.dao.PartsSearchDAO.getDealerInventoryLineItemsNofN(PartsSearchDAO.java:246)

Internet slowed, then random connectivity

So I purchased my MacBook roughly 2 years ago some time this month. It was fine for the first year and my dad didn't want to get AppleCare because nothing had happened to it yet. As I reached the end of my warranty, the internet connection started slowing down gradually. About three months after my warranty expired, my hard drive died. I had to shell out $100 for a new one and installation. At this point in time, my internet connection was at it's worse. It would show full signal strength to my router, however would not allow internet access. I called my ISP and had them reset it and my internet was not better. Thinking it was my router I went out and got another. With that router, I was able to achieve random connectivity whenever my MacBook felt like it. We have since purchased another router in the hopes that it would get better, but it didn't. It's stayed the same, or gotten worse. I can achieve internet through wired means, directly to the wall, but it's rather bothersome and defeats the purpose of having a laptop if you can't move it. If you think you know what the problem is, let me know. If you know how much the repair would be, let me know. If it's too high, as a simple look-over costs $50, I would rather purchase a new computer.

Hi,
Have a look through this discussion. There might be an answer.
http://discussions.apple.com/thread.jspa?threadID=1345209&tstart=15
Good luck,
Alan

Random connection loss

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