Error 721 on reliance netconnect data card

[Makrand]

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I am getting Error 721 on reliance netconnect . A PPP conversation was attempted, but the remote computer did not respond. can some one help me ?

Thanks

[Aadarsh]

Uninstall and re-install driver. To uninstall data card software- Go to Start -> Settings -> Control Panel. Open Add or Remove Programs.

[Jimyk]

Install data card software- Run the setup file of data card software from the CD & follow the instructions.