If you got authentication error with Echofon, make sure following things.

• Check your clock settings. OAuth requires correct timestamp. Make sure you also set correct timezone.
• Check your connectors on twitter.com. (http://twitter.com/settings/connections)
• Enter your username (screen_name), not e-mail address.
• Twitter temporarily locks your account after several failed login attempts. Try again after a few minutes.

If you still have authentication issues, click here to send a report. If you using Echofon Firefox, please attach error logs into the report.