Internet is down HELP!

Here is my problem if i plug my laptop in to the incoming wan connetion (manuel configured) i get internet so i know that the connection in is good. If i pluged labtop in to the lan connetion with the wan connection plugged in i still have internet.  so i know the router is working.

if i unplug my dns server the internet will start working on a mauneul configured computer. As soon as the dns server comes up again internet drops off. So i figured something with dns. so i got the ip address of google.com and tried it that way and it still would not come up.

I have check the dns settings and everthing seems to be working fine. its funny cuase everthing was working fine yeseterday and no changes where made.  

Just a note the dns server is also where we are hosting the exchange. (with works inside the domain but will not send anything out side of it).


any thing to point me the correct direction would be a great help.been working on it for 5 hours and no luck.  

thank you
jamyoungAsked:
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jamyoungAuthor Commented:
FYI server got hit with a massive internet attack. I pulled it down and resintalled the server.  

Thanks for all your help.
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perfectpcCommented:
Ok know it may be a stupid question but is the dns service running?

Do you forwarders setup. If so do they point to you isp and have they changed their dns servers
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jonahzonaCommented:
A topology would help us get to the bottom of the problem more quickly. Do you have one you could post?
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jamyoungAuthor Commented:
yes the dns server is running.
dns from the isp are fine.

is a star topology


there was one never created i took over this job not to long ago.

basically wan comes in to router then goes to switches.
dns is handle locally and so is dhcp.

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jonahzonaCommented:
Before you go any further, check your system events in your DNS server to see if anything has occurred since yesterday.

Next I would say to do a ordered-power cycle. Turn off modem (if you are on cable) and router. Power up modem first, power up router modem is all the way on. Then power on switch and DNS.

If you have already done this, then ignore it. But it is the first place I always start.
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jamyoungAuthor Commented:
Yeah i have done this already
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jonahzonaCommented:
Alright, moving forward.

If you can RDP or log on locally to the DNS server, can you ping your gateway? Can you ping external domains?
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perfectpcCommented:
Are we talking a windows server here. If so do have any errors in the event log?

If a windows server it could be worth removing dns and reinstalling and I have seen this resolve errors before.
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jonahzonaCommented:
Here is a screenshot from our Terminal Server.

From looking at your screenshots, is your domain called HOME? I was just assuming that all of your users are created through an Active Directory domain.

 TS Config TS Config
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jonahzonaCommented:
WRONG POST! Sorry guys. Too many EE windows open. DELETE.
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jamyoungAuthor Commented:
There are no errors in the event log . i am going to uninstall dns and will let you know how that goes
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jamyoungAuthor Commented:
Ok i took off the dns and reinstalled it now ever pc and all other servers have internet but now i have no exchange servers. the dns server is also the exchange box. Also not able to ping it from any other pc.
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jamyoungAuthor Commented:
See above
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