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What command (debug) can I use to see authentication errors on a cisco 3G router specifically for the 3G connection?

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    You should provide some more information about how the router is configured and what kind of authentication it is using. – Daniel Dib May 29 '13 at 7:10
  • @DanielDib This is a practical question in general for 3G routers. I have to configure 3G routers once and a while and those routers use different kinds of authentication (ex: PAP, CHAP). I want to know if there is a general debugging mechanism to see authentication errors. – Bulki May 29 '13 at 7:23
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Most 3G authentication will be done via PPP using either CHAP or PAP, so I'd start with:

debug ppp negotiation
debug ppp authentication

and see what you get back.

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