List of error codes for dial-up connections or VPN connections

This article lists the error codes that you may receive when you make a dial-up connection or a VPN connection.

Applies to:   Windows 10 - all editions, Windows Server 2012 R2
Original KB number:   824864

Note

Error codes with numbers higher than 900 will only be seen if you are trying to connect to a Routing and Remote Access Server that is running Windows 2000 or later.

Error codes

The following list contains the error codes for dial-up connections or VPN connections:

  • 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

    ERROR_INVALID_SMM

  • 746

    ERROR_SMM_UNINITIALIZED

  • 747

    ERROR_NO_MAC_FOR_PORT

  • 748

    ERROR_SMM_TIMEOUT

  • 749

    ERROR_BAD_PHONE_NUMBER

  • 750

    ERROR_WRONG_MODULE

  • 751

    The callback number contains an invalid character. Only the following 18 characters are allowed: 0 to 9, T, P, W, (,), -, @, and space

  • 752

    A syntax error was encountered while processing a script.

  • 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 connection 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.

  • 759

    An error occurred while the existing Internet Connection Sharing settings were being changed.

  • 760

    An error occurred while routing capabilities were being enabled.

  • 761

    An error occurred while Internet Connection Sharing was being enabled for the connection.

  • 762

    An error occurred while the local network was being configured for sharing.

  • 763

    Internet Connection Sharing cannot be enabled. There is more than one LAN connection other than 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 that is required for automatic IP addressing.

  • 766

    A certificate could not be found. Connections that use the L2TP protocol over IPSec require the installation of a machine certificate, also known as a computer certificate.

  • 767

    Internet Connection Sharing cannot be enabled. The LAN connection selected as 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 computer 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 remote computer 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 connection requires a certificate, and no valid certificate was found. For further assistance, click More Info or search Help and Support Center for this error number.

  • 782

    Internet Connection Sharing (ICS and Internet Connection Firewall (ICF cannot be enabled because Routing and Remote Access has been enabled on this computer. To enable ICS or ICF, first disable Routing and Remote Access. For more information about Routing and Remote Access, ICS, or ICF, see Help and Support.

  • 783

    Internet Connection Sharing cannot be enabled. The LAN connection selected as the private network is either not present, or is disconnected from the network. Ensure that the LAN adapter is connected before enabling Internet Connection Sharing.

  • 784

    You cannot dial using this connection at logon time, because it is configured to use a user name different than the one on the smart card. If you want to use it at logon time, you must configure it to use the user name on the smart card.

  • 785

    You cannot dial using this connection at logon time, because it is not configured to use a smart card. If you want to use it at logon time, you must edit the properties of this connection so that it uses a smart card.

  • 786

    The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication.

  • 787

    The L2TP connection attempt failed because the security layer could not authenticate the remote computer.

  • 788

    The L2TP connection attempt failed because the security layer could not negotiate compatible parameters with the remote computer.

  • 789

    The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

  • 790

    The L2TP connection attempt failed because certificate validation on the remote computer failed.

  • 791

    The L2TP connection attempt failed because security policy for the connection was not found.

  • 792

    The L2TP connection attempt failed because security negotiation timed out.

  • 793

    The L2TP connection attempt failed because an error occurred while negotiating security.

  • 794

    The Framed Protocol RADIUS attribute for this user is not PPP.

  • 795

    The Tunnel Type RADIUS attribute for this user is not correct.

  • 796

    The Service Type RADIUS attribute for this user is neither Framed nor Callback Framed.

  • 797

    A connection to the remote computer could not be established because the modem was not found or was busy. For further assistance, click More Info or search Help and Support Center for this error number.

  • 798

    A certificate could not be found that can be used with this Extensible Authentication Protocol.

  • 799

    Internet Connection Sharing (ICS cannot be enabled due to an IP address conflict on the network. ICS requires the host be configured to use 192.168.0.1. Ensure that no other client on the network is configured to use 192.168.0.1.

  • 800

    Unable to establish the VPN connection. The VPN server may be unreachable, or security parameters may not be configured properly for this connection.

  • 801

    This connection is configured to validate the identity of the access server, but Windows cannot verify the digital certificate sent by the server.

  • 802

    The card supplied was not recognized. Check that the card is inserted correctly, and fits tightly.

  • 803

    The PEAP configuration stored in the session cookie does not match the current session configuration.

  • 804

    The PEAP identity stored in the session cookie does not match the current identity.

  • 805

    You cannot dial using this connection at logon time, because it is configured to use logged on user's credentials.

  • 900

    The router is not running.

  • 901

    The interface is already connected.

  • 902

    The specified protocol identifier is not known to the router.

  • 903

    The Demand-dial Interface Manager is not running.

  • 904

    An interface with this name is already registered with the router.

  • 905

    An interface with this name is not registered with the router.

  • 906

    The interface is not connected.

  • 907

    The specified protocol is stopping.

  • 908

    The interface is connected and hence cannot be deleted.

  • 909

    The interface credentials have not been set.

  • 910

    This interface is already in the process of connecting.

  • 911

    An update of routing information on this interface is already in progress.

  • 912

    The interface configuration in invalid. There is already another interface that is connected to the same interface on the remote router.

  • 913

    A Remote Access Client attempted to connect over a port that was reserved for Routers only.

  • 914

    A Demand Dial Router attempted to connect over a port that was reserved for Remote Access Clients only.

  • 915

    The client interface with this name already exists and is currently connected.

  • 916

    The interface is in a disabled state.

  • 917

    The authentication protocol was rejected by the remote peer.

  • 918

    There are no authentication protocols available for use.

  • 919

    The remote computer refused to be authenticated using the configured authentication protocol. The line has been disconnected.

  • 920

    The remote account does not have Remote Access permission.

  • 921

    The remote account has expired.

  • 922

    The remote account is disabled.

  • 923

    The remote account is not permitted to logon at this time of day.

  • 924

    Access was denied to the remote peer because username and/or password is invalid on the domain.

  • 925

    There are no routing enabled ports available for use by this demand dial interface.

  • 926

    The port has been disconnected due to inactivity.

  • 927

    The interface is not reachable at this time.

  • 928

    The Demand Dial service is in a paused state.

  • 929

    The interface has been disconnected by the administrator.

  • 930

    The authentication server did not respond to authentication requests in a timely fashion.

  • 931

    The maximum number of ports allowed for use in the multilinked connection has been reached.

  • 932

    The connection time limit for the user has been reached.

  • 933

    The maximum limit on the number of LAN interfaces supported has been reached.

  • 934

    The maximum limit on the number of Demand Dial interfaces supported has been reached.

  • 935

    The maximum limit on the number of Remote Access clients supported has been reached.

  • 936

    The port has been disconnected due to the BAP policy.

  • 937

    Because another connection of your type is in use, the incoming connection cannot accept your connection request.

  • 938

    No RADIUS servers were located on the network.

  • 939

    An invalid response was received from the RADIUS authentication server. Make sure that the case-sensitive secret password for the RADIUS server is set correctly.

  • 940

    You do not have permission to connect at this time.

  • 941

    You do not have permission to connect using the current device type.

  • 942

    You do not have permission to connect using the selected authentication protocol.

  • 943

    BAP is required for this user.

  • 944

    The interface is not allowed to connect at this time.

  • 945

    The saved router configuration is incompatible with the current router.

  • 946

    RemoteAccess has detected older format user accounts that will not be migrated automatically. To migrate these manually, run XXXX.

  • 948

    The transport is already installed with the router.

  • 949

    Received invalid signature length in packet from RADIUS server.

  • 950

    Received invalid signature in packet from RADIUS server.

  • 951

    Did not receive signature along with EAPMessage from RADIUS server.

  • 952

    Received packet with invalid length or Id from RADIUS server.

  • 953

    Received packet with attribute with invalid length from RADIUS server.

  • 954

    Received invalid packet from RADIUS server.

  • 955

    Authenticator does not match in packet from RADIUS server.