Hi everyone...
My sharepoint system was working all along. Then suddenly it started giving out issue. When the home page opens as shown in the figure below:

If any of the top-link bar sites are clicked, it now displays:
<id id="L_11001_5">Try the following:</id>
- Refresh page: Search for the page again by clicking the Refresh button. The timeout may have occurred due to Internet congestion.
- Check spelling: Check that you typed the Web page address correctly. The address may have been mistyped.
- Access from a link: If there is a link to the page you are looking for, try accessing the page from that link.
<id id="L_11001_9">If you are still not able to view the requested page, try contacting your administrator or Helpdesk.</id> |
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Technical Information (for support personnel)
- Error Code 11001: Host not found
- Background: This error indicates that the gateway could not find the IP address of the website you are trying to access. This is usually due to a DNS-related error.
- Date: 4/20/2015 1:56:15 PM
- Server: Octavius.Theoiltestgroup.local
- Source: DNS error

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Meanwhile, if change the url manually by entering for instance hermes:20646:oiltest/personal/ots/default.aspx that site will open. But if the link is clicked, it wont open.
Kindly assist.