I have been happily using Sify Broadband for many months now. Today, they made some changes to their setup, and boom! no more Sify access for me. All that the client says is a "Internal error. Unable to parse the XML."
I called them up and they asked me to upgrade the client from 2.8 to 3.0. I said I was on Mac. They said, "Uhhh.... I don't know, sir. We'll revert back to you in the morning."
I switched on my desktop and couldn't login from Linux using the latest version of their client either. Then, I had to try Windows, the Sify client upgrade worked like a charm and that's what I'm using right now.
Guess, they can add this to the list.