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Losing Network after about 12 hours

Posted on 2013-01-11
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Last Modified: 2013-04-14
Really odd problem today.

I have an industrial touchscreen on our shop floor that won't stay networked.  It's hard wired and well under 300 ft.  When I first plug it in, I get a network connection instantly and everything works perfectly for about 12 hours.  Then I lose http access.  I can still ping, VNC, RDP, etc.  Just can't access any webpages from the touchscreen.

After verifying that all of my settings are correct, I reboot.  Then I don't get any network access.  The NIC says "cable unplugged".  I'm sure it's not the touchscreen because it works perfectly if I move it somewhere else.  I ran a new cable, same thing.  It ran for about 12 hours, then lost its http only.  I tried a different touchscreen and new cable, same thing.  

What could cause this.  I know the switch isn't bad because the other touchscreens in the same switch are all working perfectly.  I also tried different ports in the switch.

Thanks for any input.
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Question by:abcbev
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Expert Comment

by:setasoujiro
ID: 38767265
Can you try and update the driver for the nic?
or uninstall the nic and reinstall
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Author Comment

by:abcbev
ID: 38767277
Tried both.  Neither had any effect.  And the touchscreen works if I move it to another location in the building and plug it in.  At this point, it has to be hardware related, but not on the touchscreen.
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Expert Comment

by:mat1458
ID: 38767626
If you say "I tried a different touchscreen and new cable, same thing": does that mean that is says unplugged or that it runs for 12 hours and then drops HTTP? If this is the case I'd again have a look at the cabling (did you change the 300ft or just the patch cable?) or start to change switchport, then switch.

The dropping of just web raises another question: are the web servers inside your company or do you have to cross firewall/web proxy?
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Author Comment

by:abcbev
ID: 38767705
The webserver it's accessing is withing the company.  There is not hardware or software firewalls in play here.

When I tried other touchscreens and cables, it had the same effect.  Worked for 12 hours, then stopped.  However, if I took it somewhere else (e.g. my office) it worked and stayed up indefinitely.
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Expert Comment

by:eeRoot
ID: 38767738
Use this tool to scan the open ports on the device when it is working properly to see what ports are open when it is working.

http://www.snapfiles.com/get/advportscan.html

Then next time the http access drops, do another port scan.  If you get a successful connection on the http port, then the web server is working but not responding for some reason.  If you don't get a connection, then either the web server service has stopped responding or something on the network is blocking it.

Is there a firewall or some network security device on your network that may be blocking traffic?
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Expert Comment

by:mprssjpr
ID: 38767765
Have you actually restarted the switch?
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Expert Comment

by:mat1458
ID: 38768210
Waht type of switch are you using? Can you send the config?
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Author Comment

by:abcbev
ID: 38768347
It's a dumb switch.  Not sure on the brand off the top of my head, but there's not config.

I'm currently having maintenance run a cat6 from another location to see what happens.
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Expert Comment

by:mprssjpr
ID: 38769909
Still worth restarting it, though, dumb or otherwise. I've known switches display behaviour similar to this before. It might be holding something nonsensical regarding that NIC.
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Author Comment

by:abcbev
ID: 38779562
Ok, so I've narrowed things down a bit.

I've restarted and/or replaced everything.  The touchscreen, cables, switch.  When I get lucky (I can't seem to find any pattern to what makes it work), it runs for 12-24 hours perfectly, then just quits.  But it's not actually stopped.  I've said before that I can still VNC to the machine.  I can also access another one of our internal servers, one that is only text based.  That prompted me to run a bandwidth check, and I found out that it dropped from the usual, near 10Mb/s down to about 10kbps.  The webpage the touchscreen is supposed to be on is java with a lot of images and such, so the browser can't load it with that slow of a connection.

So new question, what would cause that sudden drop in bandwidth?
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Expert Comment

by:mat1458
ID: 38781776
First question with bandwidth drops: what about duplex settings? What is your switch doing, how's the touchscreen configured? Either auto-auto, full-full or half-half is allowed (ok auto-half is ok as well).
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Accepted Solution

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abcbev earned 0 total points
ID: 39061744
It was some sort of hardware problem on the PC end. We purchased a new computer and it's been working for a couple weeks now.
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Author Closing Comment

by:abcbev
ID: 39077823
Didn't really resolve, just worked around.
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