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I have recently had my home internet connection established. Presently, it is a straight broadband connection, without (wireless) router or modem.
In this time, I have noticed that I am unable to access particular IT sites—I am receiving dialogs indicating as much eg. no access to Tinyurl, OpenDNS, Wikipedia page on Alternative DNS, other IT support sites. This occurs when I conduct a search by search engine or attempting via placing a url into either of the Firefox or Internet Explorer browser directly.
The peculiar point is that I had been able to utilise TinyURL in a public network, but have noticed that this inability to use it has occurred only recently. I do not know if it (& the other site problem) has coincided with my home internet connection access or not.
With the home internet connection, I have forced a full refresh on Firefox browser (my default), and have flushed the DNS cache. To no avail.
Can anyone give me an indication of what additional steps I can take to solve this problem?

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