LOSS OF INTERNET CONNECTION

Please help me, I am close to a nervous breakdown!
I had an internet connection once, I would lose the connection occassionally, but had no problem reconnecting. Now it has gone completely! (1 month and counting!)
Thought it might be a router problem, so brought a new one. I now have 2 routers, 2 lots of leads, 3 ethernet cables, 5 filters....still cant connect.
Take equipment round to my friends house, connect first time no problems, using all leads router etc etc. Still cant connect at my house!
Friend brings laptop round (PC rubbish) connects and surfs no problem, thru my router or the usb modem supplied by tiscali (usb modem wont work on mac) Ring Bt, no problems with line (get green light for telephone connection on router, but no green light for internet) Ring tiscali, again no problem with connection) Its not hard using DHCP, email address & password, router seems to try to connect, only error code I recieve is CHAP protocol error.....my Mac not talking to there server....I think!
Network connection on mac gives me 3 green lights for ethernet, network, ISP, but 2 red lights for internet and server!!!
Have rebuilt the machine 3 times, dump prefs, dumped caches, smu reset, everything I can think off!
I can see from the forum that there are a lot of people out there with similar problems, Any ideas please? Be gentle, new to mac's

Can you draw a schematic of your setup?
surge protector for modem => modem => router/switch
=> ethernet surge protector => ethernet cable to Mac.
Ethernet ports are vulnerable to power outage and
surges as well as whatever summer lightning storms
can create.
A surge protector for the modem is a good investment.
But it allows more power through than should be on
the ethernet cat5 and going into your Mac's ethernet
port.
Did you look into using or buying a 2nd modem?
Netgear has ADSL modem-router/switches in US for
$105. I don't know how proprietary or anything the UK
systems are.
In Tiger I found (back around 10.3.4) that I had to
put the primary and secondary DNS IP address, which
were automatically picked up by router, into the
Network control panel to prevent delays. Then to turn
off IPv6 (causes slower response or no response and
isn't wildly supported it seems, but not sure why it
is even there then).
Can you or have you reset the router or modem? most
have a button that will return it to default state,
but lose any settings you have provided.
I'm not sure what was in your .sig as to mac etc and
whether you can use an alternate ethernet type
connection, PC-CARDBUS or wireless router connection.
Hello "The Hatter", thanks for replying to me,
I have already purchased a second router, but I am still getting the same problem, Have reset the routers back to factory default on numerous occasions (with no success)
Get the same problem when connecting wireless as well
Lan light flickers when trying to connect with mac, so I presume a signal is coming from the mac to the router.
The only error message i get is on the router is LCP or CHAP negotiation failure. Sounds like tiscali server is not recognising my email address/password, will email you a schematic

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Hi @BMATH
Thank you your query.
I understand that after updating to Windows 8.1 about every 6 weeks you loose wireless connectivity for no reason and the web pages are very slow to open. If you uninstall and reinstall Windows 8.1 it works fine again for about the same amount of time. You have done this about 4 times with the same result each time.
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You stated you do not believe you have any viruses. Just to be sure here are two links that will help confirm that.
Microsoft Malicious Software Removal Tool
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After updating to Windows 8.1 have you checked for Windows updates?
Have you ran HP Support Assistant ?
Here is a link to Troubleshooting Wireless Network and Internet (Windows 8) that may also help.
If the issue should remain please contact HP support for assistance.
Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
World Wide Phone Support
Best of Luck!
Sparkles1
I work on behalf of HP
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To Fix:
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Apple Mobile Device Support uninstall and itunes install causes loss of internet connection

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Launch the Console application in any of the following ways:
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Hi Larry,
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Sorry for the long answer
Cheers
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Email accounts lockout along with loss of internet connection

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Hi Larry,
If you go to Control Panel -> Network Connections (For Vista and Windows 7: Network and Sharing Center) -> Double click on your Network Adaptor (Vista and 7: Top left hand corner of the Network and Sharing Center, click on 'Change Adaptor Settings' and double click on your adaptor. Click Properties and scroll down to 'Internet Protocol Version 4 (TCP /IPv4), click Properties and make sure that 'Obtain an IP Address automatically' and Obtain DNS server address automatically' are ticked. Click Ok, then OK, then finally close. Check to see if you have connectivity. If you don't, go to start, in Run (Or in the search bar) type 'cmd'. Once Command Prompt opens, type 'ipconfig /flushdns'. Close Command Prompt and check again. If you still don't have Internet connectivity, go to Internet explorer and click Tools -> Internet Options (If you have Internet Explorer 7 or 8, press Alt before looking for tools. This will make the bar appear). Go to the Connections Tab and click on 'Lan Settings'. Make sure that you do not have 'Use a proxy server for your LAN' ticked. Also make sure that you have 'Automatically Detect Settings' ticked. Once you have done this, click Ok, Apply and Ok and check again for connectivity. If this didn't resolve your problem please post back
Sorry for the long answer
Cheers
Like this post? Give it a Star . If this post answers your question, please Mark it as the Accepted Solution.

Loss of internet connection thru airport express

Hi
Every time I download software updates I lose my internet connection.
I then have great difficulty in re-connecting. I have tried using the lock on the network connections to keep the settings , but for some reason the lock is unlocked after a period of time even though I have not requested it. I suspect that there may be a conflict between the keychain access and the airport express but I cannot prove this for sure. Does anyone have any suggestions ?
Fred

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Loss of Internet connection through TC after sleep.

I have a Netgear ADSL Wireless modem which is connected to a TC in bridge mode.
So here is what happens, I am connected wirelessly to the TC and can access the internet no problem. I then put the MacBook Pro to sleep, then on waking the MacBook I have no internet connection. But if I select the wireless network of the Netgear I do have an internet connection. The MacBook then at some point reverts back to the TC wireless network and all works OK. I think it reverts back to the TC network after a sleep period.
It does not do this every time but it does it enough to have become annoying.
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Hi Larry,
If you go to Control Panel -> Network Connections (For Vista and Windows 7: Network and Sharing Center) -> Double click on your Network Adaptor (Vista and 7: Top left hand corner of the Network and Sharing Center, click on 'Change Adaptor Settings' and double click on your adaptor. Click Properties and scroll down to 'Internet Protocol Version 4 (TCP /IPv4), click Properties and make sure that 'Obtain an IP Address automatically' and Obtain DNS server address automatically' are ticked. Click Ok, then OK, then finally close. Check to see if you have connectivity. If you don't, go to start, in Run (Or in the search bar) type 'cmd'. Once Command Prompt opens, type 'ipconfig /flushdns'. Close Command Prompt and check again. If you still don't have Internet connectivity, go to Internet explorer and click Tools -> Internet Options (If you have Internet Explorer 7 or 8, press Alt before looking for tools. This will make the bar appear). Go to the Connections Tab and click on 'Lan Settings'. Make sure that you do not have 'Use a proxy server for your LAN' ticked. Also make sure that you have 'Automatically Detect Settings' ticked. Once you have done this, click Ok, Apply and Ok and check again for connectivity. If this didn't resolve your problem please post back
Sorry for the long answer
Cheers
Like this post? Give it a Star . If this post answers your question, please Mark it as the Accepted Solution.

Time Capsule - Loss of Internet Connection

Configuration:
Time Capsule connected to Oceanic Cable (Time Warner in Hawaii) modem
Wired ethernet to iMac & TV complex (DVD, Apple TV, Roku)
WiFi to 2 Airport Expresses (network extensions). Lots of Apple products talking wirelessly
The ethernet communications (wired input) for my Time Capsule (1st edition) seems to have failed. I note the following symptoms:
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When I plug the Time Capsule into the Comcast modem, the internet connectivity for all devices (both wired and wireless) is lost. This seem to be the only problem. All other parts of the Time Capsule are working. I can see hard drive and attached external drive.
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Are you rebooting both the cable modem and the TC when you swap the TC back?
That is usually necessary on any cable system.. just check the TC if it is picking up a WAN IP.. most likely not.
I presume this has been working fine for ages and has failed recently?
A gen1 TC is 4years old.. it is well past its use by date.. many died at 1.5-2 years.. they were only supposed to last 3years anyway.
I think it is simply time for a new one. But you can try a full factory reset of the Gen 1.. just see what happens.
http://support.apple.com/kb/HT3728

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