@Salman
Thanks for replying but the suggestion you have posted I already tried it before starting the topic here and it has not work. The real problem is not only limited to mailing or community sites but I tried to report the error to microsoft online and even that website shows the same notification. The funny part is I could access these sites from proxy sites like Ctunnel etc.
Here is the screenshot of accessing my Yahoo account from Ctunnel.
Also I am recieving error notification on someother websites in the information bar but those sites are accessible. I hope now you could understand the problem fully.