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Lose Internet Connection Periodically

By Dragon Emperor ·
When connected to the internet I have full access for a seemingly random amount of time. Sometimes I can go days, other times only a few minutes. Usually it is more like 30 minutes.

When the problem happens I cannot read email or browse the internet. I can still ping and access network computers. The only way to regain access appears to be a reboot.

I have wireless broadband.
All computers are running Windows 2000 SP 4.
I have an SMC Barricade 7004BR router and an Asante FriendlyNET switch.
All computers are protected by up to date firewalls (Sygate) and
antivirus (Panda).

The problem occurs when I directly connect to the broadband modem as well.

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by Dragon Emperor In reply to

I have tried a large number of spyware detectors. I also have an uptodate Antivirus program and a firewall that informs me of any communications going in or out. I have even tried trojan scanners. Nothing gave any indication of infection.

I also believe it is some setting that is causing it. The funny thing is that it started after I switched providers.

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by puterg33k In reply to Lose Internet Connection ...

I'de have to agree with the one whom previously said the arp cache was bad, however you said you checked that. The only other option for you at this point is check fourms for that product for this problem being your switch. I had the same problem with my linksys, so I went to there website and "flashed" the product. Try that with SMC and maybe try another switch/router combo.

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by Dragon Emperor In reply to

As I said, the problem happens when directly connected to the wireless modem. I have tried direct connect from multiple computers (which also have different Ethernet cards) and no luck. I know that Linksys is know for a similar problem (at work we have a computer that suffered from it). None of my equipment has such a known issue. My router is also up to date.

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by jjgonzal In reply to Lose Internet Connection ...

Telecoms do not provide static ip`s for customers using broadband connections (PPPoA)over ATM networks.Ips` are assigned dynamically.
As a telecom insider,I know that the situation you mention is very prevalent.I would venture to say: If broadband (DSL,Cable etc.) connections were stable and drop free, they would be a very economical alternative to leased lines w/static IPs. I have DSL 768 using a 2Wire modem. Before this I had constant problems just like the ones you are having.With this unit,I am able to perform varied diagnostics.I wind up doing a re-sync which of course leaves me with a different IP.I have Win 98, Win 2000 pro and XP pro boxes and all are affected..............
I have found that all the problems are ISP/ATM related (gremlins);it would seem that this makes setting up and maintaining cheap VPN`s too much of a hassle and not an alternative to static ip leased internet lines.

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by Dragon Emperor In reply to

I suspected the problem was caused by my ISP (since I did not have it with my old broadband (DSL with a static IP)), but there must be a solution. Logging out and logging back in, or rebooting, fixes it. So somthing must be happening to the system that makes the problem occur, and thus can be fixed. I just don't know what it is. Are you saying that with a static address these problems don't occur?

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by ACSTech01 In reply to Lose Internet Connection ...

Attempt to connect directly to your broadband connection
without the router, switch, firewalls, or antivirus... nothing but
an ethernet connection to your broadband modem.

If it works, then slowly add things, one by one. First the router,
then the switch, then the firewalls - one by one, then the
antivirus application. When it stops working after one of them,
you'll know which is causing the problem - if it's a problem with
one of them.

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by Dragon Emperor In reply to

The problem occurs even when directly connected, and I have tried several different computers doing so. I have also tried with my security applications turned off.

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by ACSTech01 In reply to Lose Internet Connection ...

If several computers are experiencing the problem, perhaps it's
an issue at your ISP. Have you contacted them?

You might also try a friend's Mac, Linux, or Win95 machine.
Perhaps it's a problem with your specific SP of 2000, or maybe
one of Microsoft's little "security fixes."

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by Dragon Emperor In reply to

The problem started with changing my ISP, so I assume it is the source of the problem. Windows 95 does not appear to experience it (but I have not left any 95 machine run for much time, and they have different TCP stacks so it would not be surprising if whatever is happening doesn't affect them in the same way). I have not tried Mac or Linux, but presumably with different stacks they would be affected the same way.

My ISP has been unhelpful. I suspected a patch, but have no way of knowing. Reinstalling the system is not an option.

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by tg4 In reply to Lose Internet Connection ...

This is not an answer, but a comment: I have the SAME EXACT problem, and I'm so glad that I have found someone else with it! :) My specs are slightly different however, which makes me believe that it is probably a problem with the OS and most likely a security patch that microsoft has released lately...? (Or worse, maybe a fluky conflict with one of our drivers and a patch).

I am using XP Pro SP2, and have updated my PC with all available security patches from Microsoft (possible problem).

I took my router out of the equation and have my PC connected directly to my Cable Modem. My ISP is Time Warner Cable (in California) -- and have had them visit 3 times (all is good from their end they continually claim). I am on my 3rd network card (and have ruled out that it is a network card problem.) I lose internet connection after about 30 minutes (althought it varies) and must reboot my PC (not cable modem) to fix this problem. When I lose the connection, I still have an ip address from my ISP on my PC. I can renew and release this IP address with no problem (with browsing capabilities gone) but do not regain browsing capabilities. Have tried multiple browsers.

I'm testing with another computer now, to see if I have the same problem with another XP Pro computer. All signs have been good so far (so it appears like it might be my 1 PC -- I'll give an update.) I have made sure my PC is clean (with NAV Pro 2003 and Ad-Aware Spyware Cleaning Software.) I have no firewall software or hardware running...

I don't mean to add confusion to original post, but it seems like we have the same problem. It also seems like it's a fairly unique problem (as I haven't had much luck finding any other info on it.) At the least: Any thoughts on where we could find more info on a problem like this?

Thanks very much!

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