DUNS ERROR 756
756 - This connection is already being dialed.
This error indicates more than one simultaneous request to make a dial-up networking connection has been made.
This can occur if you have one or more programs set up to automatically make a connection to the Internet. Check the settings for your e-mail, browser and other applications that access the Internet, disabling automatic connection as appropriate.
757 - Remote access services could not be started automatically. Additional information is provided in the event log.
758 - Internet connection sharing is already enabled on the connection.
760 - An error occurred while routing capabilities were being enabled.
761 - An error occurred while Internet connection sharing was being enabled for the connection.
763 - Internet connection sharing cannot be enabled. There are two or more LAN connections in addition to the connection to be shared.
DUNS ERROR 764
764 - No smart card reader is installed.
This error can occur if the Security settings of your Connectoid are incorrect: in the security tab, make sure that the option to use a Smart Card is NOT enabled. With most connections, the security setting should be "typical" and allow an unsecured password.
765 - Internet connection sharing cannot be enabled. A LAN connection is already configured with the IP address required for automatic IP addressing.
766 - The system could not find any certificate.
767 - Internet connection sharing cannot be enabled. The LAN connection selected on the private network has more than one IP address configured. Reconfigure the LAN connection with a single IP address before enabling Internet connection sharing.
768 - The connection attempt failed because of failure to encrypt data.
DUNS ERROR 769
769 - The specified destination is not reachable.
This error should only occur if you are trying to connect to the Internet or remote server via a PPPoE (Point-to-point protocol over Ethernet) link. A PPPoE connection is often used with DSL service, but is almost never used for a dial-up connection to the Internet.
Check your network connections (connectoids) - if you show all connections (Start-> Connect to -> Show all connections) make sure that your dial-up connectoids are listed in the 'dial-up' section. If you are trying to establish a VPN (virtual private network) dial-up connection, it's necessary to specify a normal dial-up connectoid in the 'First dial' section of the VPN connectoid.
This error may also occur if you are attempting to establish a PPPoE connection via a network card that is not enabled (or properly installed). See MS KB Q316395.
770 - The remote machine rejected the connection attempt.
771 - The connection attempt failed because the network is busy.
772 - The remote computer's network hardware is incompatible with the type of call requested.
773 - The connection attempt failed because the destination number has changed.
774 - The connection attempt failed because of a temporary failure. Try connecting again.
DUNS ERROR 775
775 - The call was blocked by the remote computer.
This error cannot occur with Windows 95/98 or NT - only with Windows Me, 2K or XP.
Make sure you are dialing the correct phone number.
Make sure that your login information (user name / password) is correct. See: Connectoids.
Make sure you have an account that has not been restricted with the ISP you are calling.
Try dialing and do a test login using Hyperterminal.
776 - The call could not be connected because the destination has invoked the Do Not Disturb feature.
DUNS ERROR 777
777 - The connection attempt failed because the modem (or other connecting device) on the remote computer is out of order.
This error cannot occur with Windows 95/98 or NT - only with Windows Me or 2K.
This error can occur if you have installed your modem with an incorrect driver. Identify your modem chipset, PCI ID, manufacturer, and make sure you are using the correct driver.
If you get this error, the modem or DUNS may not be installed or set-up properly. See if you can talk to your modem with Hyperterminal setup as described here - if you can, inspect/re-install DUNs; if you cannot, the modem needs to be re-installed. In some cases, a simple cold-boot (shut down - power off - re-start) may solve the problem.
This error may also occur if the number you are dialing is blacklisted.
Many PCI modems include an entry in Windows' ADD/REMOVE PROGRAMS (from Control Panel or System): it is important to remove any installed modems using this remove function to properly update the registry. In some cases where the modem has been installed more than once with different driver versions without proper removal, the registry may be corrupted: if this is the case, only manual editing, restore from backup, or re-installation of Windows may cure the trouble.
Also note: In many cases, PCI modems will not operate in all of your PCI slots - see this page.
Also see: Forum56 Post regarding HP-supplied modem and error 777.
778 - It was not possible to verify the identity of the server.
779 - To dial out using this connection, you must use a smart card.
DUNS ERROR 780
780 - An attempted function is not valid for this connection.
Check your Connectoid - make sure it is set properly. It should be set to dial out using a modem on your machine and not via a network.
If you are attempting to access the Internet through a local area network, the network setup may be incorrect.
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