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Not able to open some site from MTNL Triband

I have MTNL triband connection in my office (Ghatkopar). I am facing problem to open some sites from MTNL triband internet connection. (i.e Hotmail, Hi5 etc.). But these sites are open from our TATA internet connection which i used as a backup.

Pls solve this issue as soon as possible.

Thanking you

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