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The ISP Guide  >  DUN Error Message
AT&T High Speed Internet
Error Message
776The call could not be connected because the destination has invoked the Do Not Disturb feature
777The connection attempt failed because the modem on the remote computer is out of order
778It was not possible to verify the identity of the server
779To dial out using this connection
780An attempted function is not valid for this connection
781The encryption attempt failed because no valid certificate was found

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