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DNS Error ( I think )

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by z0rtix

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Heloo everyone ,

I will cut this short, I am a new network admin employee in a small company , as i arrived to this company , i changed the network in order to enhance the Internet connection speed ( PS : We Use ADSL ) , it worked all fine, the connection speed was at least 50% better , one week later , the line dropped dead from the ISP it self , when it came back , i was unable to login to any Authinticating Servers e.g.( Hotmail , Yahoo ) it gives me The Page Cannot be Displayed , this problem existed only in my company , all other companies worked perfictlly , I contacted the network admin of my ISP and he says that the problem is from my side , 6 days later , the connection is back to ( PERFECT ) , my employer cut 6 days from my pay check sayin that the problem was from my side , although i tried everything that could be the problem , i even tried formatting some systems and tried again , i installed linux in order to check the connection , and it was the same , when i contacted the ISP admin again , he is on a paid vecation , i cant know if the problem was from my side or from the ISP side , i would have a fight with my employer if it was from the ISP's Side , but i wouldnt rush things , what am askin is , Is Anyone fimiler with this problem and perhaps can tell me Were was the problem .

Thanks in advance.

5 replies

by Member 32254067

try some basic network troubleshooting. Try to ping the site. See if your network can resolve the address. From there you can check to see if dns is screwed up..

by cptomlly

In addition to Crazy's suggestion of ping testing, you might also try nslookup to see what server is resolving DNS names. Open a command prompt and enter nslookup, then a ? for syntax info.

If you are running DNS service inside your network and pointing the internal clients to it, you should verify that you have forwarders established to all DNS addresses provided by your ISP.

Personally, I'm a little suprised that your ISP support didn't give you more assistance in the matter. I'd be shopping for a new one (that is, if one is available)

by sysengineer

Sounds like its on the end of your ISP. You said they dropped the line..?. Then they might have had a problem with their servers also. They may have mis-configured their servers when they got them and the line up and running again with the incorrect information of your companies account.

by lmayeda

I had a very similar problem where my ISP went down and after rebooting our DSL modem and router, the internet connections were either VERY slow or "Page cannot be displayed". After much troubleshooting, we determined that by entering a specific IP address for a DNS server instead of "automatically detect", we were once more able to connect instantly. The ISP claims that the IP address of their DNS server had not changed. Then at another division, a similar problem occurred (different ISP) but in this case ONLY those PCs whose network configuration was set to "automatically detect DNS server" could still connect to the internet others failed. For this site I used the IP addresses of an old faithful DNS server. Not sure exactly what the issue is.

by lmayeda

I had a very similar problem where my ISP went down and after rebooting our DSL modem and router, the internet connections were either VERY slow or "Page cannot be displayed". After much troubleshooting, we determined that by entering a specific IP address for a DNS server instead of "automatically detect", we were once more able to connect instantly. The ISP claims that the IP address of their DNS server had not changed. Then at another division, a similar problem occurred (different ISP) but in this case ONLY those PCs whose network configuration was set to "automatically detect DNS server" could still connect to the internet others failed. For this site I used the IP addresses of an old faithful DNS server. Not sure exactly what the issue is.

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