win server 2008 r2 does not connect to the internet

Hello Experts,
Our win server does not connect to the internet.
it used to but not any more. We don´t know why.
It can be seen and accessed on the lan.
I tried to modify the "internet options" but it does not let me and its set to high
We are working with a workgroup
our local ips are 10.0.0.X
mask 255.255.255.0
modem 10.0.0.1
Please your support
Regards,
RGuillermoProject ManagerAsked:
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Ashok DewanFreelancerCommented:
Turnoff the windows inbuilt firewall for a while and then try to ping your modem ip address. and then ISP dns ip address. Is your lan icon on right below at task bar on desktop showing any Exclamation mark ?. also check DNS servers from lan adaptor properties.
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meko72Commented:
Just as neil40m suggested check your LAN adapter properties for the DNS but also check to see if you have the gateway address set to the router\firewall address too
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systechadminConsultantCommented:
Suggest to rename the host name and then try to connect to the internet
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RGuillermoProject ManagerAuthor Commented:
Thanks to you all!!
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