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I am unable to use Tata Indicom CDMS USB modem

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I am constantly getting an error code 691.

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Error 691 is related to credentials authentication which in this case means that there is something wrong with your authentication details (username/password) or the domain you are trying to log in. Please make sure you are using correct info and the CAPSLOCK key is turned off.

It seems that the connection between you and the server your are trying to access is OK because that response is sent by the server so in this case, you might want to carefully type your login data.

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