Dial-Up Networking Errors

A listing in numeric order of Microsoft Dial-Up Networking (DUNS) Error codes with the Microsoft error message following. In most cases there is a hyperlink you can follow for more information on what to do about the error. If you are getting an error that does not have more information here, please let us know!
NOTE: Some solutions indicate to re-install DUNs and/or TCP/IP. See this Microsoft article for Win 95/98

600 - An operation is pending.
601 - The port handle is invalid.
602 - The port is already open.
603 - Caller's buffer is too small.
604 - Wrong information specified.
605 - Cannot set port information.
606 - The port is not connected.
607 - The event is invalid.
608 - The device does not exist.
609 - The device type does not exist.
610 - The buffer is invalid.
611 - The route is not available.
612 - The route is not allocated.
613 - Invalid compression specified.
614 - Out of buffers.
615 - The port was not found.
616 - An asynchronous request is pending.
617 - The port or device is already disconnecting.
618 - The port is not open.
619 - The port is disconnected.
620 - There are no endpoints.
621 - Cannot open the phone book file.
622 - Cannot load the phone book file.
623 - Cannot find the phone book entry.
624 - Cannot write the phone book file.
625 - Invalid information found in the phone book.
626 - Cannot load a string.
627 - Cannot find key.
628 - The port was disconnected.
629 - The port was disconnected by the remote machine.
630 - The port was disconnected due to hardware failure.
631 - The port was disconnected by the user.
632 - The structure size is incorrect.
633 - The port is already in use or is not configured for Remote Access dialout.
634 - Cannot register your computer on the remote network.
635 - Unknown error.
636 - The wrong device is attached to the port.
637 - The string could not be converted.
638 - The request has timed out.
639 - No asynchronous net available.
640 - A NetBIOS error has occurred.
641 - The server cannot allocate NetBIOS resources needed to support the client.
642 - One of your NetBIOS names is already registered on the remote network.
643 - A network adapter at the server failed.
644 - You will not receive network message popups.
645 - Internal authentication error.
646 - The account is not permitted to log on at this time of day.
647 - The account is disabled.
648 - The password has expired.
649 - The account does not have Remote Access permission.
650 - The Remote Access server is not responding.
651 - Your modem (or other connecting device) has reported an error.
652 - Unrecognized response from the device.
653 - A macro required by the device was not found in the device .INF file section.
654 - A command or response in the device .INF file section refers to an undefined macro
655 - The <message> macro was not found in the device .INF file section.
656 - The <defaultoff> macro in the device .INF file section contains an undefined macro
657 - The device .INF file could not be opened.
658 - The device name in the device .INF or media .INI file is too long.
659 - The media .INI file refers to an unknown device name.
660 - The device .INF file contains no responses for the command.
661 - The device .INF file is missing a command.
662 - Attempted to set a macro not listed in device .INF file section.
663 - The media .INI file refers to an unknown device type.
664 - Cannot allocate memory.
665 - The port is not configured for Remote Access.
666 - Your modem (or other connecting device) is not functioning.
667 - Cannot read the media .INI file.
668 - The connection dropped.
669 - The usage parameter in the media .INI file is invalid.
670 - Cannot read the section name from the media .INI file.
671 - Cannot read the device type from the media .INI file.
672 - Cannot read the device name from the media .INI file.
673 - Cannot read the usage from the media .INI file.
674 - Cannot read the maximum connection BPS rate from the media .INI file.
675 - Cannot read the maximum carrier BPS rate from the media .INI file.
676 - The line is busy.
677 - A person answered instead of a modem.
678 - There is no answer.
679 - Cannot detect carrier.
680 - There is no dial tone.
681 - General error reported by device.
682 - ERROR WRITING SECTIONNAME
683 - ERROR WRITING DEVICETYPE
684 - ERROR WRITING DEVICENAME
685 - ERROR WRITING MAXCONNECTBPS
686 - ERROR WRITING MAXCARRIERBPS
687 - ERROR WRITING USAGE
688 - ERROR WRITING DEFAULTOFF
689 - ERROR READING DEFAULTOFF
690 - ERROR EMPTY INI FILE
691 - Access denied because username and/or password is invalid on the domain.
692 - Hardware failure in port or attached device.
693 - ERROR NOT BINARY MACRO
694 - ERROR DCB NOT FOUND
695 - ERROR STATE MACHINES NOT STARTED
696 - ERROR STATE MACHINES ALREADY STARTED
697 - ERROR PARTIAL RESPONSE LOOPING
698 - A response keyname in the device .INF file is not in the expected format.
699 - The device response caused buffer overflow.
700 - The expanded command in the device .INF file is too long.
701 - The device moved to a BPS rate not supported by the COM driver.
702 - Device response received when none expected.
703 - ERROR INTERACTIVE MODE
704 - ERROR BAD CALLBACK NUMBER
705 - ERROR INVALID AUTH STATE
706 - ERROR WRITING INITBPS
707 - X.25 diagnostic indication.
708 - The account has expired.
709 - Error changing password on domain.
710 - Serial overrun errors were detected while communicating with your modem.
711 - RasMan initialization failure. Check the event log.
712 - Biplex port is initializing. Wait a few seconds and redial.
713 - No active ISDN lines are available.
714 - Not enough ISDN channels are available to make the call.
715 - Too many errors occurred because of poor phone line quality.
716 - The Remote Access IP configuration is unusable.
717 - No IP addresses are available in the static pool of Remote Access IP addresses.
718 - PPP timeout.
719 - PPP terminated by remote machine.
720 - No PPP control protocols configured.
721 - Remote PPP peer is not responding.
722 - The PPP packet is invalid.
723 - The phone number, including prefix and suffix, is too long.
724 - The IPX protocol cannot dial-out on the port because the computer is an IPX router.
725  The IPX protocol cannot dial-in on the port because the IPX router is not installed.
726 - The IPX protocol cannot be used for dial-out on more than one port at a time.
727 - Cannot access TCPCFG.DLL.
728 - Cannot find an IP adapter bound to Remote Access.
729 - SLIP cannot be used unless the IP protocol is installed.
730 - Computer registration is not complete.
731 - The protocol is not configured.
732 - The PPP negotiation is not converging.
733 - The PPP control protocol for this network protocol is not available on the server.
734 - The PPP link control protocol terminated.
735 - The requested address was rejected by the server.
736 - The remote computer terminated the control protocol.
737 - Loopback detected.
738 - The server did not assign an address.
739 - The remote server cannot use the Windows NT encrypted password.
740 - The TAPI devices configured for Remote Access failed to initialize or were not installed correctly.
741 - The local computer does not support encryption.
742 - The remote server does not support encryption.
743 - The remote server requires encryption.
744 - Cannot use the IPX net number assigned by the remote server. Check the event log.
745 - An essential file is missing. Re-install Dial-Up Networking
752 - A syntax error was encountered while processing a script. 

Note: Errors #753 and higher are applicable only to Windows 2000 & higher.

753 - The connection could not be disconnected because it was created by the multi-protocol router.
754 - The system could not find the multi-link bundle.
755 - The system cannot perform automated dial because this entry has a custom dialer. specified.
756 - This connection is already being dialed.
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.
764 - No smart card reader is installed.
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.
769 - The specified destination is not reachable.
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.
775 - The call was blocked by the remote computer.
776 - The call could not be connected because the destination has invoked the Do Not Disturb feature.
777 - The connection attempt failed because the modem (or other connecting device) on the remote computer is out of order.
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.
780 - An attempted function is not valid for this connection.
781 - The encryption attempt failed because no valid certificate was found.
Also see: Microsoft's Windows98 Communications Error Messages.
Also see: Microsoft Windows 2000 Documentation - DUNS errors.

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