"For best Download Speed of Triband , WINDOWS XP and LAN PORT Recommended....."
Well atleast they say it out loud.
Sify has put out a new protocol for its broadband dialer which has been implemented only in its windows dialer. The linux and MAC dialers have not been updated. They have maintained backward compatibility for the *nix dialers so far in Mumbai but there have been reports elsewhere that they have simply disabled the old protocol without updates. Here's a ref:
http://broadbandforum.in/Linux_Client_not_working-t4384.html
And emailing customer care really doesn't seem to help at all as I only got an autoreply.
Siddhesh