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Wierd Problem

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Guest_imported

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Jan 1, 1970
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Hello,

We have a Cisco 1720 router with nat enabled, can ping and access some sites using http but not others.

Strange thing is that although we cannot access some websites trough a browser we can always telnet in on port 80


For instance we cannot access through a browser but when we telnet in on 80 we get

<!DOCTYPE HTML PUBLIC &quot;-//IETF//DTD HTML 2.0//EN&quot;>
<HTML><HEAD><TITLE>501 Not Implemented</TITLE></HEAD><BODY><H1>501 Not Implement
ed</H1>
Request not implemented</body></html>
Connection to host lost.

As expected.

Do you think this is something to do with the our ISP setup DNS?

TIA,
Denod
 
More info needed:
Type and version of IOS? Does it have a firewall feature set? and what version?

running-config or show tech support minus password and public ip addresses as well as any company info.

Does the problem occur only from some machines or all?
 
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